Hitachi Sj7002 Owners Manual

							Using Intelligent Output Terminals
Operations
and Monitoring
4–50
Examples 3 and 4 relate to configuring the inverter to retry upon power failure. Frequency 
matching is possible if the inverter frequency is  greater than the B007 value. In this case, the 
inverter reads the motor RPM and direction. If  this speed is higher than the matching setting 
(B007), the inverter waits until they are equal  and then engages the output to drive the motor 
(example 3). If the actual motor speed is less th an the restart frequency setting, the inverter 
waits for t
2 (value in B003) and restarts from 0  Hz (example 4). The display shows “ 0000” 
during an actual frequency matching event.
The Instantaneous Power Failure and Alarm outp ut responses during various power loss condi-
tions are shown in the diagram below. Use B004 to enable/disable the alarm output when 
instantaneous power failure or under-voltage oc curs. The alarm output will continue while the 
control power of the inverter is present, even  if the motor is stopped. Examples 5 to 7 
correspond to normal wiring of the inverter’s co ntrol circuit. Examples 8 to 10 correspond to 
the wiring of the inverter’s control circuit for  controlled deceleration after power loss (see 
“
Optional Controlled Decel  and Alarm at Power Loss” on page 4–4).
Power supply
Inverter output
Motor
frequency
Motor frequency > B007 value at t2
Example 3: Motor resumes via frequency-matching Example 4: Motor restarts from 0Hz
t0t2
Power supply
Inverter output
Motor
frequency
t0t2
Free-runFree-run
Frequency matching 0Hz restart
Motor frequency < B007 value at t2
B007B007
tt
Instantaneous power failure operation with standard  R0–T0 connections Instantaneous power failure operation with R0–T0 
connected to P–N
Example 5
Powe r1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Stop
Example 6
Powe r 1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Stop
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm Inst. Power Fail
Example 7Inverter : Stop Power
1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Run
Power 1
0
Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Run
1
0
1
0
1
0
1
0
Powe r Run command
Output
Alarm Inst. Power Fail Inverter : Run
1
0
Example 8
Power
1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Stop
Example 9
Power 1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Stop
1
0
1
0
1
0
1
0
Power
Run command
Output
Alarm Inst. Power Fail
Example 10Inverter : Stop Power
1
0
1
0Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Run
Power 1
0
Run command
Output
Alarm Inst. Power Fail
1
0
1
0
Inverter : Run
1
0
1
0
1
0
1
0
Power Run command
Output
Alarm Inst. Power Fail Inverter : Run
1
0
(under-voltage)

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							SJ7002 Inverter
Operations
and Monitoring
4–51
To r q u e  L i m i t  
Signal   The Torque Limit output [TRQ] work s in conjunction with the torque limit function covered in 
the intelligent input section. The torque limit function limits the motor torque according to the 
criteria selected by parameter  B040. When torque limiting occurs, the [TRQ] output turns ON, 
then turns OFF automatically when the output torque falls below the specified limits. Note that 
the Torque Limit input [TL] must be ON in order to enable torque  limiting and its related 
output, [TRQ]. See  “
To r q u e  L i m i t” on page 4–30 in the intelligent input section.
Run Time / 
Power-On Time 
Over Signals   SJ7002 Series inverters accumulate the total hours  in Run Mode (run time) and the total hours 
of power-ON time. You can set thresholds for thes e accumulating timers. Once the threshold is 
exceeded, an output terminal will turn ON. One us e of this is for preventative maintenance. A 
signal light or audible alert  could signal the need for servicing, calibration, etc.
The two outputs [RNT] and [ONT] share the same  time threshold parameter, B034. Typically, 
you will use either the [RNT] or the [ONT]  output only—not both at once. These outputs are 
useful for the notification that a preventative maintenance interval has expired.
Opt. Code10
Symbol[TRQ]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings B040... if 
B040=00  then set 
B041, B042,  B043, B044
Default 
terminals Requires 
config.
Opt. Code 
and 
Symbol11=[RNT]
12=[ONT]
Valid for  Outputs[11 to [15],  [ALx]
Required
Settings B034
Default 
terminals Requires 
config.
SymbolFunction NameDescription
RNT Run Time Over ON when the accumulated time spent in  Run Mode exceeds the limit (B034)
ONT Power-ON Time Over ON when th e accumulated power-ON time 
exceeds the limit (B034)

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							Using Intelligent Output Terminals
Operations
and Monitoring
4–52
Thermal Warning 
Signal   The purpose of the electronic thermal setti ng is to protect the motor from overloading, 
overheating and being damaged. The setting is base d on the rated motor current. The inverter 
calculates the thermal rise (heating) of the moto r using the current output to the motor squared, 
integrated over the time spent at those levels. This feature allows the motor to draw excessive 
current for relatively short periods  of time, allowing time for cooling.
The Thermal Warning output [THM] turns ON to provide a warning before the inverter trips for 
electronic thermal protection. You can set a uniq ue thermal protection level for each of the 
three motor profiles, as shown in the table below.
 The electronic thermal overload function uses  the output current and time to calculate 
thermal heating of the motor. Use parameter C061  to set the threshold from 0 to 100% of trip 
level for turning ON the intelligent output [THM] at that level.
 The thermistor input of the inverter is a  separate function from the electronic thermal 
function. It has its own threshold to cause a trip  alarm at a particular thermistor resistance.
For example, suppose you have inverter model 
SJ700-110LFE2. The rated motor current is 46A. 
The setting range is (0.2 * 46) to (1.2 *46), or 
9.2A to 55.2A. For a setting of B012=46A 
(current at 100%), the figure to the right shows 
the curve.
The electronic thermal characteristic adjusts the 
way the inverter calculates thermal heating, 
based on the type of torque control the inverter 
uses.
CAUTION:  When the motor runs at lower 
speeds, the cooling effect of the motor’s internal 
fan decreases.
Reduced Torque Characteristic  – The example below shows the effect of the reduced torque 
characteristic curve (for example motor and curre nt rating). At 20Hz, the output current is 
reduced by a factor of 0.8 for given trip times. 
Opt. Code10
Symbol[THM]
Va l i d  f o r  
Outputs[11 to [15],  [ALx]
Required
Settings C061
Default 
terminals Requires 
config.
Function
CodeFunction/DescriptionData or Range
B012 / B212  / B312 Electronic thermal setting (calculated 
within the inverter from current output)  Range is 0.2 * rated current to
1.2 * rated current
B013 / B213  /B313 Electronic thermal characteristic (use 
the setting that matches your load) 00 Reduced torque
01 Constant torque
02 Free-setting
Tr i p
time (s)
Trip current at 60 Hz
60
0.5 0 53.4 69 92 A
116% 150% 200%
Tr i p
time (s)
Reduced trip current at 20 Hz
Trip current 
reduction  factor
x 1.0
x 0.8
x 0.6
0 520 60 Hz
A
60
0.5 0 73.6
42.7 55.2
92.8% 120% 160%

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							SJ7002 Inverter
Operations
and Monitoring
4–53
Constant Torque Characteristic  – Selecting the constant torque characteristic for the example 
motor gives the curves below. At 2.5 Hz, the outp ut current is reduced by a factor of 0.9 for 
given trip times.
Free Thermal Characteristic  - It is possible to set the electronic thermal characteristic using a 
free-form curve defined by three data  points, according to the table below.
The left graph below shows the region for possi ble free-setting curves. The right graph below 
shows an example curve defined by three data points specified by B015 – B020.
Suppose the electronic thermal setting (B012) is  set to 44 Amperes. The graph below shows the 
effect of the free setting torque  characteristic curve. For example, at (B017) Hz, the output 
current level to cause overheating in a fixed time period is reduced to (B018) A. Points (x), (y), 
and (z) show the adjusted trip current levels in those conditions for given trip times.
Function CodeNameDescriptionRange
B015 / 
B017 / B019 Free-setting electronic 
thermal frequency 1, 2, 3
Data point coordinates for Hz axis 
(horizontal) in the free-form curve 0 to 400Hz
B016 / 
B018 /  B020 Free setting electronic 
thermal current 1, 2, 3
Data point coordinates for Ampere 
axis (vertical) in the free-form curve 0.0 = (disable)
0.1 to 1000.
Tr i p
time (s)
Reduced trip current at 2.5 Hz
Trip current 
reduction 
factor
x 1.0
x 0.9
x 0.8
0 2.5 5 60Hz
A
60
0.5 0 82.8
47.8 62.1
104% 135% 180%
Output
current (A)
Setting range
max. freq.
B020
B018
B016
B015B017B019Ax04
Trip current 
reduction  factorOutput freq.
x 1.0
x 0.8
0 5400 Hz
Hz
0
Tr i p
time (s)
(x) = B018 value x 116%
(y) = B018 value x 120%
(z) = B018 value x 150%
Reduced trip current at (B017) Hz
60
0
0.5
(x) (y) (z) A

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							Using Intelligent Output Terminals
Operations
and Monitoring
4–54
Brake Control
Signals   The Brake Control function enables the inverter to control external braking systems with a 
particular safety characteristic. The brake releas e logic convention is such that an open circuit 
fault (such as loose wire) causes the external brake to engage. A complete discussion of the 
operation of brake control is in  “
External Brake Control Function” on page 4–32. The diagram 
below shows the signals that are important to  the External Brake Control function.    
Expansion Card 
Output Signals   Other outputs listed below require expansion card  SJ-FB Encoder Feedback board. Please see 
the SJ-FB manual for more information.
Opt. Code 
and 
Symbol19=[BRK]
20=[BER]
Va l i d  f o r   Outputs[11 to [15],  [ALx]
Required
Settings B120, B121, 
B122, B123, 
B124, B125, 
B126
Default 
terminals Requires 
config.
SymbolFunction NameInput 
StateDescription
BRK Brake Release ON when the inverter signals the external brake  system to release (open) its brake
OFF when the inverter is not driving the motor, and  needs the external brake engaged
BER Brake Error ON when the output  current is less than the set 
releasing current
OFF when the brake function is not in use, or when  the output current to the motor is correct and 
it is safe to release the brake
[BRK] Brake release
[BOK] Brake confirmation
Inverter
Brake System
Emergency Brake[BER] Brake error
Opt. Code 
and 
Symbol21=[ZS]
22=[DSE]
23=[POK]
Va l i d  f o r   Outputs[11 to [15],  [ALx]
Required
Settings C061
Default 
terminals Requires 
config.
Opt.
CodeSymbolFunction NameDescription
21 ZS Zero Speed Detect  signal Signal indicates the encoder pulses of the 
motor have stopped
22 DSE Speed Deviation Excessive Velocit y error exceeds the error threshold 
defined by parameter P026
23 POK Positioning Completion Indicates the load position is at the target

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							SJ7002 Inverter
Operations
and Monitoring
4–55
Analog 
Disconnect
Detection   The analog disconnect dete ction is useful when the inverter  receives a speed reference from an 
external device. Upon input signal loss at either the [O], [OI], or [O2] terminal, the inverter 
normally just decelerates the motor to a stop.  However, the inverter can use the intelligent 
output terminals [ODc],  [OIdc], or [O2dc] to signal othe r machinery that a signal loss has 
occurred.
Each analog disconnect output has independent thresholds, set by B070, B071, and B072. 
When the input is below the set threshold value,  the inverter substitutes the threshold value for 
the input. Related parameters are gi ven in the following tables.   
The inverter can also detect when an analog input value is within a range (or  window) of values. 
See  “
Window Comparator Signals” on page 4–62.
Opt. Code 
and 
Symbol27=[Odc]
28=[OIdc]
29=[O2dc]
Valid for  Outputs[11 to [15],  [ALx]
Required
Settings B070, B071, 
B072
Default 
terminal Requires 
config.
Opt.
CodeSymbolFunction Name
27 Odc Analog [O] disconnect detect
28 OIdc Analog [OI] di sconnect detect
29 O2dc Analog [O2]  disconnect detect
CodeFunctionData or RangeDescription
B070 [O] input disconnect  threshold 0 to 100% If [O] value < B070, turn ON [Odc]; 
substitute B070 value for [O] input
no (255) Ignore B070 setting
B071 [OI] input disconnect  threshold 0 to 100% If [OI] value < B071, turn ON [Odc]; 
substitute B071 value for [OI] input
no (255) Ignore B071 setting
B072 [O2] input disconnect  threshold 0 to 100% If [O2] value < B072, turn ON [Odc]; 
substitute B072 value for [O2] input
no (255) Ignore B072 setting
[O], [OI], or [O2]
t
0
Value applied to input
t
B070B071B072
[Odc], [OIdc], or [O2dc]

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							Using Intelligent Output Terminals
Operations
and Monitoring
4–56
PID Feedback 
Second Stage 
Output   The inverter has a built-in PID loop feature for tw o-stage control, useful for certain applications 
such as building ventilation or heating and cool ing (HVAC). In an ideal control environment, a 
single PID loop controller (stage) would be  adequate. However, in certain conditions, the 
maximum output energy from the first stage is  not enough to maintain the Process Variable 
(PV) at or near the Setpoint (SP). And, the output  of the first stage is in saturation. A simple 
solution is to add a second stage, which puts an  additional and constant amount of energy into 
the system under control. When  sized properly, the boost from the second stage brings the PV 
toward the desired range, allowing the first stag e PID control to return to its linear range of 
operation.
The two-stage method of control has some  advantages for particular applications.
 The second stage is only ON in adverse condi tions, so there is an energy savings during 
normal conditions.
 Since the second stage is simple ON/OFF control,  it is less expensive to add than just dupli-
cating the first stage.
 At powerup, the boost provided by the second  stage helps the process variable reach the 
desired setpoint sooner than it wo uld if the first stage acted alone.
 Even though the second stage is simple ON/OFF co ntrol, when it is an inverter you can still 
adjust the output frequency to  vary the boost it provides.
Refer to the example diagram  below. Its two stages of control are defined as follows:
 Stage 1 - Inverter #1 operating in PI D loop mode, with motor driving a fan
 Stage 2 - Inverter #2 operating as an ON/ OFF controller, with motor driving a fan
Stage #1 provides the ventilation needs in a build ing most of the time. On some days, there is a 
change in the building’s air volume because larg e warehouse doors are open. In that situation, 
Stage #1 alone cannot ma intain the desired air flow (PV sa gs under SP). Inverter #1 senses the 
low PV and its PID Second Stage Output at [F BV] terminal turns ON. This gives a Run FWD 
command to Inverter #2 to pr ovide the additional air flow.
NOTE: The [FBV] is designed for implementing two- stage control. The PV high limit and PV 
low limit parameters, C052 and C053, do not func tion as process alarm thresholds. Terminal 
[FBV] does not provide a PID alarm function.
Opt. Code31
Symbol[FBV]
Va l i d  f o r  
Outputs[11 to [15],  [ALx]
Required
Settings C052, C053
Monitor 
Settings D004
Default 
terminals Requires 
config.
Fan  #1
Inverter #2[U, V, W]
[FW]
PID Second Stage Output Air flow Sensor
Fan #2
[FBV]
[U, V, W]
Inverter #1
[O], [OI], or [O2]
Stage #1 Stage #2
Process Variable
PV

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							SJ7002 Inverter
Operations
and Monitoring
4–57
To use the PID Second Stage Output feature, you  will need to choose upper and lower limits for 
the PV, via C053 and C052 respectively. As th e timing diagram below shows, these are the 
thresholds Stage #1 inverter uses to turn ON  or OFF Stage #2 inverter via the [FBV] output. 
The vertical axis units are perc ent (%) for the PID setpoint, and for the upper and lower limits. 
The output frequency, in Hz, is  superimposed onto the same diagram.
When system control begins, the following even ts occur (in sequence in the timing diagram):
1. Stage #1 inverter turns ON via the [FW] Run command.
2. Stage #1 inverter turns ON the [FBV] output, because the PV is below the PV low limit 
C053. So, Stage #2 is assisting in lo op error correction from the beginning.
3. The PV rises and eventually ex ceeds the PV high limit C052. Stage #1 inverter then turns 
OFF the [FBV] output to Stage #2, si nce the boost is no longer needed.
4. When the PV begins decreasing, only Stage #1 is operating, and it is  in the linear control 
range. This region is where a properly co nfigured system will operate most often.
5. The PV continues to decrease  until it crosses under the PV low limit (apparent external 
process disturbance). Stage #1 inverter turns  ON the [FBV] output, and Stage #2 inverter is 
assisting again.
6. After the PV rises above the PV low limit, the [FW] Run command to Stage #1 inverter 
turns OFF (as in a  system shutdown).
7. Stage #1 inverter enters Stop Mode and au tomatically turns OFF the [FBV] output, which 
causes Stage #2 inverter to also stop.
Network 
Detection Signal  The intelligent output [Ndc] Network Detection  Signal indicates the status of ModBus-RTU 
communications (not ASCII protocol). The [Ndc]  terminal turns ON when the external device 
on the ModBus stops transmitting for a time that exceeds parame ter C077, Communication 
Time-out Before Trip. If a time-out occurs,  the output [Ndc] remains ON until ModBus-RTU 
communication resumes. Use pa rameter C076 Action Upon Comm unication Error Selection to 
select the desired inverter re sponse to a time-out event.
PV high limit
t
0
tC052
C053
Stage #1 [FW] t
[FBV] to Stage #2 [FW]PV low limit 1
0 1PID setpoint (SP)
PID feedback (PV)
Output frequency
1, 2 3 4 5
Example:
67
Opt. Code32
Symbol[Ndc]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings C076, C077
Default 
terminals Requires 
config.
Master
t
0
C077
1
Slave (inver ter)
Watchdog timer = xx.xx sec.
0 1
Alarm output [ALx] Time-out
C076
= 00 or 01 (trip)
Network detection [Ndc]

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							Using Intelligent Output Terminals
Operations
and Monitoring
4–58
Logic Output 
Signals   The Logic Output Function uses the inverter’s bu ilt-in logic feature. You can select any two of 
the other intelligent output options for use as in ternal inputs to the logic function. You may also 
select from three logical operators AND, OR, or XOR  (exclusive OR), to be applied to the two 
inputs. A total of six outputs are avai lable, shown in the following tables.
The example below shows a configuration for  [LOG1] Logic Output 1. Parameters C142 and 
C143 contain option codes for two outpu ts we select to be used as inputs to the logic operation. 
Parameter C144 contains the  select code for the logic operation. 00=AND, 01=OR, and 
02=OR.    
Capacitor Life 
Warning   The inverter calculates the capacitor life remaining based on the internal temperature of the 
inverter and the cumulative power-ON time. Th e [WAC] Capacitor Life Warning output turns 
ON to indicate that the capaci tors have reached end-of-life. If this event occurs, Hitachi 
recommends that you replace the  main circuit board and logic circuit board. You may also use 
monitor parameter D022 at the di gital operator to monitor the status of capacitor life.
Opt. Code 
and 
Symbol
33=[LOG1]
34=[LOG2]
35=[LOG3]
36=[LOG4]
37=[LOG5]
38=[LOG6]
Va l i d  f o r   Outputs[11 to [15],  [ALx]
Required
Settings C142 to 
C159
Default 
terminal Requires 
config.
SymbolOption 
CodeFunctionA InputB InputLogical Operator
LOG1 33 Logic Output 1C142 C143 C144
LOG2 34 Logic Output 2C145 C146C147
LOG3 35 Logic Output 3C148 C149C150
LOG4 36 Logic Output 4C151 C152C153
LOG5 37 Logic Output 5C154 C155C156
LOG6 38 Logic Output 6C157 C158C159
Input States[LOGx] Output State
A InputB InputAND (00)OR (01XOR (02)
000
00
01011
10011
11110
C142
A input
B input Logic function 
AND, OR, XOR
[LOG1]
Intelligent outputs used as internal 
inputs: RUN, FA1, FA2, OL, OD, etc.:C143
C144
[RUN] = option code 00
[FA2] = option code 02
Opt. Code39
Symbol[WAC]
Va l i d  f o r  Outputs[11 to [15],  [ALx]
Monitor
Settings D022
Default 
terminals Requires 
config.

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							SJ7002 Inverter
Operations
and Monitoring
4–59
Low Cooling Fan 
Speed   The inverter monitors the heat  sink cooling fan speed to help prevent overheating. If the speed 
of the fan(s) decreases to 75% or less of full speed, output [WAF] Low Cooling Fan Speed 
turns ON. Note that if you set parameter B092  Cooling Fan Control = 01 (Fan ON only during 
RUN), the inverter will not output the [WAF ] signal when the cooling fan is stopped.
If the [WAF] signal turns ON during operation,  first check the cooling fan inlet for clogging by 
dust and debris. If the air circulation path is cl ear, the fans may need replacement. You may also 
use monitor parameter D022 at the digital ope rator to monitor the status of fan speed.
Starting Contact 
Signal   The inverter generates [FR] Starting Contact Signal to correspond with Run (FW or RV) input 
commands. The source of the Run command does no t matter (so the A002 setting is ignored). If 
both FW and RV inputs are ON, the inverter  stops motor operation and turns OFF the [FR] 
output. The [FR] signal is useful  for external devices that need a traditional starting contact 
signal to coordina te operation with the inverter.
Heatsink 
Overheat 
Warning   The inverter monitors its heat sink temperature to detect ove rheating. You can use parameter 
C064, Heatsink Overheat Warning Level, to se t the over-temperature threshold for the heatsink 
in degrees C. The inverter will turn ON intelligent output [OHF] Heatsink Overheat Warning if 
the heatsink temperature exceed s the value in parameter C064.
Opt. Code40
Symbol[WAF]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings B092
Monitor
Settings D022
Default 
terminals Requires 
config.
Opt. Code41
Symbol[FR]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings none
Default 
terminals Requires 
config.
Forward command
Reverse command
Starting Contact Signal [FR]
Opt. Code42
Symbol[OHF]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings C064
Default 
terminals Requires 
config.

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