Hitachi Sj7002 Owners Manual

							Using Intelligent Input Terminals
Operations
and Monitoring
4–20
Two - s t ag e
Acceleration and 
Deceleration   When terminal [2CH] is turned ON, the 
inverter changes the rate of acceleration and 
deceleration from  the initial settings (F002 
and F003) to use the  second set of accelera-
tion/deceleration values (A092 and A093). 
When the terminal is turned OFF, the 
inverter returns to the original acceleration 
and deceleration time (F002 acceleration 
time 1 and F003 deceleration time 1). Use 
A092 (acceleration time 2) and A093 
(deceleration time 2) to set the second stage 
acceleration and de celeration times.
In the graph shown above, the [2CH] signal become s active during acceleration. This causes the 
inverter to switch from using acceler ation 1 (F002) to acceleration 2 (A092).
Note the following:
 Function A094 selects the me thod for second stage acceleration.  It must be set = 00 to select 
the input terminal method in order for the [2CH] terminal assi gnment to operate.
Free-run Stop   When the terminal [FRS] is turned ON, the inverter turns OFF the output and the motor enters 
the free-run state (coasting). If  terminal [FRS] is turned OFF, the output resumes sending power 
to the motor if the Run command is still active. The free-run stop feature works with other 
parameters to provide flexibility in  stopping and starting motor rotation.
In the diagram below, parameter B088 selects whether the inverter resumes operation from 
0 Hz (left graph) or the current motor rotation  speed (right graph) when the [FRS] terminal 
turns OFF. The application de termines the best setting.
Parameter B003 specifies a delay time before resuming operation from a free-run stop. To 
disable this feature,  use a zero delay time.
In the diagram above, [FRS] signal is active hi gh. If you want the [FRS] terminal to be active 
low (normally closed logic), chan ge the setting (C011 to C018) that corresponds to the input [1] 
to [8] that is assigned the [FRS] function (C001 to C008).
Opt. Code09
Symbol[2CH]
Va l i d  f o r  
Inputs[1] to [8]
RequiredSettings A092, A093, 
A094=0
Default 
terminal[5]
Output
frequency
[FW, RV]
t
target frequency
initial second
Input
signals
[2CH]
Opt. Code11
Symbol[FRS]
Va l i d  f o r  Inputs[1] to [8]
RequiredSettings B003, B088, 
C011 to C018
Default 
terminal[4]
FRS
Switches
Motor 
speed
[FW, RV]
Zero-frequency start
FRS
Switches
Motor 
speed
Resume from current speed
wait time
[FW, RV]B003
B088=01B088=00Resume from 0Hz tt

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							SJ7002 Inverter
Operations
and Monitoring
4–21
External Trip   When the terminal [EXT] transitions OFF-to-ON,  the inverter enters the trip state, indicates 
error code E12, and stops the output. This is a  general purpose interrupt type feature, and the 
meaning of the error depends on what you connect  to the [EXT] terminal. Even if [EXT] is 
turned OFF, the inverter remains in the trip stat e. You must reset the inverter or cycle power to 
clear the error, returning the inverter to the Stop Mode.
In the graph below, the [EXT] input turns ON during normal Run Mode operation. The inverter 
lets the motor free-run to a stop, and the alarm output turns ON immediately. When the 
operator initiates a Reset comman d, the alarm and error are cleared. When the Reset is turned 
OFF, the motor begins rotation since the Run command is already active. 
If the USP (Unattended Start Prot ection) feature is in use, the inverter will not automatically 
restart after cancelling the EXT trip event. In  that case, it must receive either another Run 
command (OFF-to-ON transition), a keypad Reset  command, or an [RS] intelligent terminal 
input signal.
Unattended Start 
Protection   If the Run command is already present when powe r is turned ON, the inverter starts running 
immediately after powerup. The Unattended Start Protection (USP) function prevents that 
automatic startup. If the [USP] input is active, the inverter  will not run without outside interven-
tion. In this case, there are two ways to reset an alarm and resume running:
1. Turn the Run command OFF, or
2. Perform a reset operation by the terminal [R S] input or the keypad Stop/reset key
The three examples below show how the USP func tion works in the scenarios described at the 
bottom of the diagram. The error code E13 indi cates the USP trip state and corresponds to the 
Alarm  signal in the diagram. 
Note the following;
 Note that when a USP error occurs and it is ca nceled by a reset from the [RS] terminal input 
or keypad, the inverter restarts immediately.
 Even when the trip state is canceled by turn ing the terminal [RS] ON and OFF after an 
under- voltage trip E09 occurs, the USP function will be performed.
Opt. Code12
Symbol[EXT]
Valid for 
Inputs[1] to [8]
RequiredSettings (none)
Default 
terminal Requires 
config.[EXT]
 [FW, RV]
[RS]
Motor revolution speed
Alarm output terminal
t
 free run
Opt. Code13
Symbol[USP]
Valid for 
Inputs[1] to [8]
RequiredSettings (none)
Default 
terminal[6]*
* Default for -FU2 models 
only; others require input 
configuration
Powe r
supply
[FW]
Output
frequency
When USP is ON after powerup, the 
alarm (E13) will clear when the Run 
command (FW or RV) turns OFF. [USP]
[RS]
AlarmIf the alarm is cleared 
during Run command, 
the inverter output 
restarts automatically. If the Run command is 
already OFF at powerup, 
the inverter output starts 
normally.
Example 1 Example 2 Example 3
t

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							Using Intelligent Input Terminals
Operations
and Monitoring
4–22
 When the Run command is active immediately after the power is turned ON, a USP error  will occur. When this function is used, wait  for at least three (3) seconds after powerup 
before applying a Run command.
Commercial 
Power Source 
Enable   The commercial power source switching function is  useful in systems with excessive starting 
torque requirements. This feature permits the mo tor to be started “across the line,” sometimes 
called a  bypass configuration. After the motor is runnin g, the inverter takes over to control the 
speed. This feature can eliminate the need to  oversize the inverter, reducing cost. However, 
additional hardware such  as magnetic contactors wi ll be required to realize this function. For 
example, a system may require  55KW to start, but only 15KW to run at constant speed. There-
fore, a 15KW rated inverter would be suffic ient when using the commercial power source 
switching.
The [CS] Commercial Power Source Enable  input signal operation is as follows:
 OFF-to-ON transition signals the inverter that  the motor is already running at powerup (via 
bypass), thus suppressing the inverter’s motor output in Run Mode.
 ON-to-OFF transition signals the inverter to a pply a time delay (B003), frequency match its 
output to existing motor speed, and  resume normal Run Mode operation
The following block diagram shows an inverter system with  bypass capability. When starting 
the motor directly across the  line, relay contacts Mg2 are closed, and Mg1 and Mg3 are open. 
This is the bypass configuration, since the inverter  is isolated from the power source and motor. 
Then Mg1 contacts close about 0.5 to 1 second after that, supplying power to the inverter.
Opt. Code14
Symbol[CS]
Va l i d  f o r  
Inputs[1] to [8]
RequiredSettings B003, B007
Default 
terminal Requires 
config.
U
V
W
Motor
R
S
T
R0
T0
SJ7002
H
O
L
FW
[RV]
[CS]
CM1
Mg3
MCCB
Mg1
GFI
Mg2
Thermal
switch
Power source, 3-phase
AL0
AL2
AL1
L1
L2
L3

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							SJ7002 Inverter
Operations
and Monitoring
4–23
Switching to inverter control occurs after the mo tor is running at full speed. First, Mg2 relay 
contacts open. Then about 0.5 to 1 seconds later, relay Mg3 contacts  close, connecting the 
inverter to the motor. The following timing diagram shows the event sequence:
In the previous timing diagram, when the mo tor has been started across the line, Mg2 is 
switched OFF and Mg3 is switched ON. With the Forward command to the inverter already 
ON, the [CS] terminal is switched ON and relay Mg 1 contacts close. The inverter will then read 
the motor RPM (frequency matching). When the [C S] terminal is switched OFF, the inverter 
applies the  Retry wait time before motor restar t parameter (B003).
Once the delay time has elapsed the inverter wi ll then start and match the frequency (if greater 
than the threshold set by B007). If an over-current trip occurs during frequency matching, 
extend the retry wait time B003. If the ground  fault interrupter breaker (GFI) trips on a ground 
fault, the bypass circuit will not operate the mo tor. When an inverter backup is required, take 
the supply from the bypass circuit GFI. Use  control relays for [FW], [RV], and [CS]. 
Software Lock   When the terminal [SFT] is ON, the data of all the parameters and func tions (except the output 
frequency, depending on the setting of B031) is locked (prohibited from editing). The keypad 
and remote programming devices will be preven ted from changing parameters. To edit parame-
ters again, turn OFF the [SFT] terminal input. Use parameter B031 to select whether the output 
frequency is excluded from the lock state or is locked as well. Note the following:
 When the [SFT] terminal is  turned ON, only the output frequency can be changed.
 Software lock can include the output frequency by setting B031.
 Software lock by the operator is also possibl e without the [SFT] terminal being used (B031).
Mg1
Mg2
Mg3
FW
[CS]
Mg2/Mg3 delay time 0.5 to 1 sec.
Set to 0.5 to 1 sec. typical
Frequency matching
Inverter output
Normal operationB003 (Retry wait timebefore motor restart)
Opt. Code15
Symbol[SFT]
Valid for 
Inputs[1] to [8]
RequiredSettings B031 
(excluded 
from lock)
Default 
terminal Requires 
config.

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							Using Intelligent Input Terminals
Operations
and Monitoring
4–24
Analog Input 
Current/Voltage 
Select   The [AT] terminal operates in c onjunction with parameter setting A005 to determine the analog 
input terminals that are enabled for current or  voltage input. Setting A006 determines whether 
the signal will be bipolar, allowing for a reverse direction range. Note th at current input signal 
cannot be bipolar and cannot reverse direction  (must use [FW] and [RV] command with current 
input operation). The basic operation of th e [AT] intelligent input is as follows:
 [AT] = ON and A005 = 00 –  [AT] will enable terminals [OI]–[L] for current input, 
4to20mA
 [AT] = ON and A005 = 01 –  [AT] will enable terminals [O2]–[L] for voltage input
 [AT] = OFF –  Terminals [O]–[L] are enabled for vo ltage input (A005 may be equal to 
00 or 01) in this case
Be sure to set the frequency source setting A0 01=01 to select the analog input terminals. 
Please refer to  “
Analog Input Operation” on page 4–63 for more informati on on bipolar input 
configuration, and the operating ch aracteristics of analog inputs.
Reset Inverter   The [RS] terminal causes the inverter to 
turn OFF the motor output and execute a 
powerup reset. If the inverter is in Trip 
Mode, the reset cancels the Trip state. 
When the signal [RS] is turned ON and 
OFF, the inverter executes the reset opera-
tion. The minimum pulse width for [RS] 
must be 12 ms or greater. The alarm output 
will be cleared within 30 ms after the onset 
of the Reset command. Note the following:
 When the control terminal [RS]  input is already ON at powerup for more than 4 seconds, the 
remote operator display is “R-ERROR COMM”  (the display of the digital operator is 
–  –  –  –). However, the inverter has no error. To clear the digital operator error, turn OFF the 
terminal [RS] input and press one of the operator keys.
 The active edge (leading or trailing) of the [R S] signal is determined by the setting of C102.
 A terminal configured with the [RS] functi on can only be configured as a normally open 
contact. The terminal cannot be used in the normally closed contact state.
 When input power is turned ON, the inverter performs the same reset operation as it does  when a pulse on the [RS] terminal occurs.
NOTE:  For inverter models –1850Hxx to –4000Hxx: Af ter an external reset input [RS] occurs, 
the internal cooling fan turn ON after stopping once.
WARNING: After the Reset command is given and th e alarm reset occurs, the motor will 
restart suddenly if the Run command is already  active. Be sure to set the alarm reset after 
verifying that the Run command is OFF to prevent injury to personnel.
Opt. Code16
Symbol[AT]
Va l i d  f o r  
Inputs[1] to [8]
RequiredSettings A001 = 01
A005 = 00 /  01
A006 = 00 / 
01 / 02
Default 
terminal[2]
Opt. Code18
Symbol[RS]
Va l i d  f o r   Inputs[1] to [8]
RequiredSettings B003, B007, 
C102, C103
Default 
terminal[1]
[RS]
Alarm  output
t
12 ms
minimum
approx. 30 ms

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							SJ7002 Inverter
Operations
and Monitoring
4–25
Thermistor 
Thermal
Protection   Motors that are equipped with a thermistor ca n be protected from overheating. Input terminal 
[TH] is dedicated to sense ther mistor resistance. The input can be set up (via B098 and B099) 
to accept a wide variety of NTC  or PTC type thermistors. Use this function to protect the motor 
from overheating.
When a thermistor is connected between terminals [TH] 
and [CM1], the inverter checks for over-temperature and 
will cause a trip (E35) and turn OFF the output to the 
motor. Be sure the thermistor is connected to terminals 
[TH] and [CM1]. If the resistance is above or below 
(depending on whether NTC or PTC) the threshold the 
inverter will trip. When the motor cools down enough, the 
thermistor resistance will ch ange enough to permit you to 
clear the error. Press the STOP/Reset key to clear the error.
An open circuit in the thermistor causes a trip, and the 
inverter turns OFF the motor output.
Three-wire
Interface
Operation   The 3-wire interface is an industry standard motor control interface. This function uses two 
inputs for momentary contact start/stop control, and a third for selecting forward or reverse 
direction.
To implement the 3-wire interface, assign 20  [STA] (Start), 21 [STP] (Stop), and 22 [F/R] 
(Forward/Reverse) to three of the intelligent input terminals. Use momentary contacts for Start 
and Stop. Use a selector switch, such as SPST for  the Forward/Reverse input. Be sure to set the 
operation command selection A002=01 for input terminal control of motor. Note the following:
 If you have a motor control interface that ne eds logic-level control (rather than momentary 
pulse control), use the [FW] and [RV] inputs instead.
 The STP logic is inverted. Normally the switch  will be closed, so you open the switch to 
stop. In this way, a broken wire causes the motor to stop automatically (safe design).
 When you configure the inverter for 3-wire interface control, the dedicated [FW] terminal is  automatically disabled. The [RV] intelligen t terminal assignment is also disabled.
The diagram below shows the use of 3-wire control. STA (Start Motor) is an edge-sensitive 
input; an OFF-to-ON transition gives the Start command. The control of direction is level-
sensitive, and the direction may be changed at any time. STP (Stop Motor) is also a level-
sensitive input.
Opt. Code—
Symbol[TH]
Valid for  Inputs [TH only]
Required
Settings B098, B099, 
and C085
Default 
terminal[TH]
531
7642
8FWTH
PLC
CM1
P24CM1
TH
thermistor
Motor
Opt. Code  and 
Symbol20=[STA]
21=[STP]
22=F/R
Valid for  Inputs[1] to [8]
RequiredSettings A002=01
Default 
terminal Requires 
config.
SymbolFunction NameDescription
STA Start Motor Start motor rotation  on momentary contact (uses accel-
eration profile)
STP Stop Motor Stop motor rotation on momentary open (OFF is active  state), (uses deceleration profile)
F/R Forward/Reverse ON = Reverse; OFF = Forward
[STA] terminal
[F/R] terminal
[STP] terminal
Motor revolution speed
Forward Reverse
t

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							Using Intelligent Input Terminals
Operations
and Monitoring
4–26
PID Disable
and PID Clear   The PID loop function is useful for controlling  motor speed to achieve constant flow, pressure, 
temperature, etc. in many process applications. 
PID Disable –  This function temporarily suspends PID  loop execution via an intelligent input 
terminal. It overrides the parameter A071 (PID  Enable) to stop PID execution and return to 
normal motor frequency output char acteristics. the use of PID Disable on an intelligent input 
terminal is optional. Of course, any use of  the PID loop control requires setting PID Enable 
function A071=01.
PID Clear –  This function forces the PID loop integrator sum = 0. So, when you turn ON an 
intelligent input configured as [PIDC], the integrat or sum is reset to zero. This is useful when 
switching from manual control to PID  loop control and the motor is stopped.
Note the following:
 The use of [PID] and [PIDC] terminals are  optional. Use A071=01 if you want PID loop 
control enabled all the time.
 Do not enable/disable PID control while the motor is running (inverter is in Run Mode).
 Do not turn ON the [PIDC] input while the  motor is running (inverter is in Run Mode).
CAUTION: Be careful not to turn PID Clear ON and re set the integrator sum when the inverter 
is in Run Mode (output to motor is ON). Otherwise, this could cause the motor to decelerate 
rapidly, resulting in a trip.
Internal Speed 
Loop Gain 
Settings   When sensorless vector control, 0Hz sensorless vector control, or vector control with sensor is 
selected for the control method, the Control Gain  Switching function selects between two sets 
of gains in the internal speed loop. These gains  are used in proportional and integral compensa-
tion. When Control Gain Switchi ng is not selected for an intelligent input terminal, the default 
gains in effect correspond to the OFF state of [CAS].
Use [PPI] P/PI Control Switching to select be tween proportional and proportional-integral 
control.
The table below lists the functions and parameter se ttings related to internal speed loop gains. 
Opt. Code 
and 
Symbol23=[PID]
24=[PIDC]
Va l i d  f o r   Inputs[1] to [8]
Required
Settings A071
Default 
terminal Requires 
config.
Opt. Code 
and 
Symbol26=[CAS]
43=[PPI]
Va l i d  f o r   Inputs[1] to [8]
Required
Settings A044 / A244 
/ A344 = 03, 
04, or 05
Default 
terminal Requires 
config.
SymbolFunction NameInput 
StateDescription
CAS Control Gain Switching ON Gains in  parameters H070, H071, and H072 
are selected
OFF Gains in parameters H050, H051, H052; or,  H250, H251, H252 (2nd motor) are selected
PPI P / PI Control Switching ON Sel ects Proportional control (P)
OFF Selects Proportional-Integral control (PI)
Function CodeParameterSetting RangeDescription
A044 / A244 / A344 Control method 
selection 03 SLV (does not use A344)
04 0-Hz Domain SLV (does not 
use A344) 
05 V2 (does not use A244 or  A344)
C001 - C008 Intelligent input  selection 43 PPI : P/I switching
H005 / H205 Speed response 0.001 to 65.53 No dimension

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							SJ7002 Inverter
Operations
and Monitoring
4–27
The speed control mode is normally proportional-
integral compensation (PI), which attempts to 
keep the deviation betwee n the actual speed and 
speed command equal to zero. You can also select 
proportional (P) control function, which can be 
used for  droop control (i.e. several inverters 
driving one load).  Droop is the speed difference 
resulting from P control versus PI control at 100% 
output torque as shown in the graph. Set the P/PI 
switching function (option 43) to one of the intel-
ligent input terminals [1] to [8]. When the P/PI 
input terminal is ON, th e control mode becomes 
proportional control (P). When the P/PI input 
terminal is OFF, the control mode becomes 
proportional-integral control.
The proportional gain Kpp value determines the 
droop. Set the desired  value using parameter 
H052. The relationship between the Kpp  value and the droop is shown below: 
The relationship between the droop and th e rated rotation speed is shown below:
H050 / H250 PI proportional gain 0.0 to 999.9/1000 % gain
H051 / H251 PI integral gain 0.0 to 999.9/1000 % gain
H052 / H252 P proportional gain 0.01 to 10.00 No dimension
H070 PI proportional gain 
for switching 0.0 to 999.9/1000 % gain
H071 PI integral gain for  switching 0.0 to 999.9/1000 % gain
H072 P proportional gain  for switching 0.0 to 10.0 No dimension
H073 Gain switching time 0. to 999. Millisceonds
Function CodeParameterSetting RangeDescription
0 Speed of rotation
Torque
P Control
Droop
100% PI Control
Droop
10
(Kpp Set Value)--------------------------------%
()
=
Droop Speed error at rated torque
Synchronous speed base frequency
--------------------------------------------------------------------- -=

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							Using Intelligent Input Terminals
Operations
and Monitoring
4–28
Remote Control 
Up and Down 
Functions   The [UP] [DWN] terminal functions can adjust the output frequency for remote control while 
the motor is running. The acceleration time and deceleration time used with this function is the 
same as for normal operation ACC1 and DEC1  (2ACC1,2DEC1). The input terminals operate 
as follows:
In the graph below, the [UP] and [DWN] terminals activate while the Run command remains 
ON. The output frequency responds to the [UP] and [DWN] commands. 
It is possible for the inverter to retain the frequency set from the [UP] and [DWN] terminals 
through a power loss. Parameter C101 enables/di sables the memory. If disabled, the inverter 
retains the last frequency before an UP/DWN ad justment. Use the [UDC] terminal to clear the 
memory and return to the original set output frequency.
Force Operation 
from Digital 
Operator   This function permits a digital operator interfac e to override the Run command source setting 
(A002) when it is configured for a source other than the operator interface. When the [OPE] 
terminal is ON, the operator interface Run  command over-rides commands from input termi-
nals (such as [FW], [RV]). The inverter will use the standard output  frequency settings to 
operate the motor. When the [OPE] terminal is  OFF, the Run command operates normally, as 
configured by A002.
When changing the [OPE] state during Run Mode  (inverter is driving the motor), the inverter 
will stop the motor before the new [OPE] state  takes effect. If the [OPE] input turns ON and the 
digital operator gives a Run comm and while the inverter is already running, the inverter stops 
the motor. Then the digital operator can control the motor.
Opt. Code 
and 
Symbol27=[UP]
28=[DWN]
29=[UDC]
Va l i d  f o r   Inputs[1] to [8]
RequiredSettings A001 = 02;
C101 = 01  (enables 
memory)
Default 
terminal Requires 
config.
SymbolFunction NameDescription
UP Remote Control UP Function Accelerate s (increases output frequency) motor 
from current frequency
DWN Remote Control DOWN  Function Decelerates (decreas
es output frequency)
 motor 
from current frequency
UDC Remote Control Data Clear Clears the Up/down frequency memory
Output
frequency
[UP]
[FW, RV] [DWN]
t
Opt. Code31
Symbol[OPE]
Va l i d  f o r  
Inputs[1] to [8]
RequiredSettings A001,
A002 (set not 
equal to 02)
Default 
terminal Requires 
config.

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							SJ7002 Inverter
Operations
and Monitoring
4–29
Overload
Restriction   The inverter constantly moni tors the motor current during  acceleration, deceleration, and 
constant speed. If the inverter reaches the ove rload restriction level, it adjusts the output 
frequency automatically to limit the amount of  overload. This function prevents an over-current 
trip by inertia during rapid acce leration or large changes in load  at constant speed. It also 
attempts to prevent an over-voltage trip on dece leration due to regeneration. It accomplishes 
this by temporarily suspending  deceleration and/or increasing th e frequency in order to dissi-
pate regenerative energy. Once the DC bus volt age falls sufficiently, deceleration will resume.
OLR Parameter Selection  – Two sets of overload restriction parameter settings and values are 
available as outlined in the table below.
Use the B021—B026 group of settings to config ure the two set of parameters as needed. By 
assigning the Overload Restriction function [OLR] to an intelligent terminal, you can select the 
set of restriction paramete rs that is in effect.
Note the following:
 If the overload restriction constant (B023 or  B026) is set too short, an over-voltage trip 
during deceleration will occur due to regenerative energy from the motor.
 When an overload restri ction occurs during acceleration, the motor will take longer to reach 
the target frequency, or may not reach it. The  inverter will make the following adjustments:
a) Increase the acceleration time
b) Raise torque boost
c) Raise overload restriction level
Opt. Code39
Symbol[OLR]
Valid for 
Inputs[1] to [8]
RequiredSettings B021 – B023 
(Set 1), 
B024 – B026 
(Set 2)
Default 
terminal Requires 
config.
SymbolFunction NameInput 
StateDescription
OLR Overload Restriction  Selection ON Selects Overload Restriction Set 2,
B024, B025, B026 settings in effect
OFF Selects Overload Restriction Set 1, B021, B022, B023 settings in effect
Function
Function Code
Data or RangeDescription
Set 1Set 2
Overload Restriction 
Operation Mode B021 B024 00 Disable
01 Enabled during accel and constant speed
02 Enabled during constant  speed
03 Enabled during accel,  constant speed, and 
decel
Overload Restriction 
Setting B022 B025 Rated current * 0.5 
to rated current * 2Current value at which 
the restriction begins
Deceleration Rate at 
Overload Restriction B023 B026 0.1 to 30 seconds Deceleration time when 
overload restriction 
operates

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