Hitachi Sj7002 Owners Manual

							Using Intelligent Output Terminals
Operations
and Monitoring
4–60
Low Output 
Current Signal   The inverter monitors the output current to  the motor according to parameter C038, Low 
Current Indication Output M ode Select. Use parameter C039, Low Current Indication 
Detection Level, to set the low-current threshol d. The Low Output Current Signal [LOC] will 
turn ON if the output current is less than  the C038 threshold and motor operation corresponds 
to the selected monitoring mode.
Note 1: Note that when parameter A001 Frequency So urce Setting = 01 (control terminal), it 
is possible that the inverter may not recogn ize a constant speed due to sampling, In 
this case, change C038 = 00 to include accel./d ecel., or increase the analog input filter 
A016 setting. 
General Output 
Signals   Refer to the Easy Sequence Inst ruction Manual for information on  how to configure and use the 
general purpose outputs MO1 to MO6.
Opt. Code43
Symbol[LOC]
Va l i d  f o r  
Outputs[11 to [15],  [ALx]
Required
Settings C038, C039
Default 
terminals Requires 
config.
CodeFunctionData or RangeDescription
C038 Low current indication  output mode select 00 Output during accele
ration/deceleration 
and constant speed operation
01 Output only during constant speed *1
C039 Low current indication  detection level 0.0 to 2.0 x 
rated inverter 
current Low current threshold, used for 
intelligent output [LOC]
Output current (A)
t
0
t
C038
Low output current [LOC]
Opt. Code  and 
Symbol
44=[MO1]
45=[MO2]
46=[MO3]
47=[MO4]
48=[MO5]
49=[MO6]
Va l i d  f o r   Outputs[11 to [15],  [ALx]
Required
Settings See Easy 
Sequence
Default 
terminal Requires 
config.

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							SJ7002 Inverter
Operations
and Monitoring
4–61
Inverter Ready 
Signal   The inverter turns ON the Inverter Ready Signal [I RDY] output when it is ready to receive an 
operation command such as Run Forward, Run Reverse, or Jog. Otherwise, [IRDY] will be 
OFF and the inverter cannot accept operation  commands. If [IRDY] is OFF, then check the 
input power supply voltage at the [R], [S], and [T] terminals to be sure the voltage is within the 
input specification range. The [IRDY] output is  OFF when the input power is provided only to 
the control power supply,
Forward/Reverse 
Rotation Signals  The Forward Rotation Signal [FWR] is ON only when the inverter is driving the motor in the 
foward  direction. Similarly, the Reverse Rotation Si gnal [RVR] is ON only when the inverter is 
driving the motor in the  reverse direction. Both signals are OFF when the motor is stopped.
Major Failure 
Signal   The Major Failure Signal [MJA] indicates that a  particular type of error event has occurred, 
resulting in an inverter trip. In addition to causing the normal trip alarm, the following error 
events also will turn ON the [MJA] output, when  assigned to an intelligent output terminal.
Opt. Code50
Symbol[IRDY]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings none
Default 
terminals Requires 
config.
Opt. Code 
and 
Symbol51=[FWR]
52=[RVR]
Valid for  Ouputs[11 to [15],  [ALx]
Required
Settings none
Default 
terminal Requires 
config.
Output frequency (Hz)
t
0
t
Forward Rotation Signal [FWR]
t
Reverse Rotation Signal [RVR]
Opt. Code53
Symbol[MJA]
Valid for 
Outputs[11 to [15],  [ALx]
Required
Settings none
Default 
terminals Requires 
config.
Error 
CodeName
E 10CT (current transformer) error
E 1 1CPU error
E 14Ground fault
E20Inverter thermal trip with low fan speed
E23Gate array error
E25Main circuit error

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							Using Intelligent Output Terminals
Operations
and Monitoring
4–62
Window 
Comparator 
Signals   The window comparator function outputs turn  ON when You can also monitor each analog 
input by comparing it to a thre shold value. This feature allows  the inverter to detect discon-
nected signal wiring, loss of power at a signal tr ansmitter, etc. When the input is below the set 
threshold value, the inverter substitutes the thre shold value for the input. The related parameters 
are given in the following tables.   
The following signal diagram shows the wind ow comparator output generated from input 
signals and comparator setti ngs listed along the Y axis.
Opt. Code 
and 
Symbol54=[WCO]
55=[WCOI]
56=[WCO2]
Va l i d  f o r   Ouputs[11 to [15],  [ALx]
Required
Settings none
Default 
terminal Requires 
config.
Opt.
CodeSymbolFunction Name
54 WCO [O] terminal window comparator
55 WCOI [OI] terminal window comparator
54 WCO2 [O2] terminal window comparator
CodeFunctionRangeDescription
B060[O] input maximum limit level of 
window comparator 0. to 100. (%) Lower limit = B061 + B062 x 2
B061[O] input minimum limit level of 
window comparator0. to 100. (%) Lower limit = B060 – B062 x 2
B062[O] input hysteresis width of 
window comparator 0. to 10. (%) Lower limit = B061 – B062 x 2
B063[OI] input maximum limit level 
of window comparator0. to 100. (%) Lower limit = B064 + B066 x 2
B064[OI] input minimum limit level of 
window comparator0. to 100. (%) Lower limit = B063 – B066 x 2
B065[OI] input hysteresis width of 
window comparator 0. to 10. (%) Lower limit = B063 – B064 x 2
B066[O2] input maximum limit level 
of window comparator
–100. to 100. (%) Lower limit = B067 + B068 x 2
B067[O2] input minimum limit level 
of window comparator–100. to 100. (%) Lower limit = B066 – B068 x 2
B068[O2] input hysteresis width of 
window comparator 0. to 10. (%) Lower limit = B066 – B067 x 2
[O], [OI], or [O2]
t
0
Hysteresis region
t
B062B065B068
[WCO], [WCOI], or [WCO2]
B060B063B066
B061B064B067Hysteresis region

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							SJ7002 Inverter
Operations
and Monitoring
4–63
Analog Input Operation
Input Terminal 
SignalsSJ7002 inverters provide for an external analog 
input to command the inverter frequency output 
value. The analog input terminal group includes 
the [L], [OI], [O], [O2], and [H] terminals on the 
control connector, which provide for Voltage [O] 
and [O2] or Current [OI]  input. All analog input 
signals must use the analog ground [L].
If you use either the voltage or current analog 
input, you must select on e of them using the logic 
input terminal function  [AT] analog type. If 
terminal [AT] is OFF, the voltage input [O] can 
command the inverter output  frequency. If terminal 
[AT] is ON, the current input [OI] can command 
the inverter output frequency. The [AT]  terminal function is covered in “
Analog Input Current/
Voltage Select” on page 4–24. Remember that you must also set A001 = 01 to select analog 
input as the frequency source.
Input FilterParameter A016 adjusts an analog input sampling  filter that evenly affects all analog inputs 
shown above. The parameter range is from 1 to  30. Before increasing the filter setting, we 
recommend trying to find the cause of inpu t analog noise. Check for the following:
 Look for nearby high-current wiring—avoid an y parallel runs to the analog signal wires
 Check the impedance between th e chassis grounds of the inverter and the analog signal 
source equipment—a good connecti on will have a low impedance
 Check the analog signal ground impedance from  the inverter to the analog signal source
 Avoid ground loops... measure the current (or  voltage drop) on the chassis ground and signal 
ground connections; the ideal value is zero
After taking steps to minimize the analog signal no ise sources, increase the filter time constant 
(A016) until the motor output frequency (when  commanded by analog inputs) becomes stable.
HO2FMAM
OOILAMI
+V Ref.
A GND
0—10V input
4—20mA input
-10 / 0 / +10V 
+ –
4-20 mA
Frequency
source setting
1V – I select
0 – 10V
+ –-10 / 0 / +10V
O2 O
O
OI
HO2FMAM
OOILAMI
A005A001=01
A005=00
A005=01
AT = O N
AT = O F F
AT = O N
0 1
0
10
1
0
1
Frequency setting
Terminals
(Keypad)
OI
O2 O
L AT

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							Analog Input Operation
Operations
and Monitoring
4–64
The following tables show the available anal og input settings. Parameters A006, A005, and 
input terminal [AT] determine  the External Frequency Command input terminals that are avail-
able and how they function. The Trim Freque ncy input [O2]—[L] is available (when check 
marked) for some settings. Other settings make  the reverse direction (in addition to forward) 
available for bipolar input sett ings (when check marked). A bi polar input responds to positive 
input voltages with a forward motor rotation, and  to negative input voltages with reverse motor 
rotation.
The table below applies when the [AT]  input function is not assigned to any intelligent input 
terminal. The A005 setting, nor mally used in conjunction with an [AT] input, is ignored.
CAUTION: Whenever the [AT] input function is  not assigned to any input terminal and 
reverse rotation is not desired or is unsafe, be  sure to set A006 = 01. This setting makes the 
[O2] input unipolar only.
A006A005[AT]External Frequency 
Command InputTrim Frequency 
Command InputReverse avail.
(bipolar input)
00
 OR 03 00 OFF [O]
✘✘
ON [OI] ✘✘
01 OFF [O]✘✘
ON [O2] ✘✔
01 00 Example 
1 OFF
[O] [O2] ✘
ON [OI] [O2]✘
01 OFF [O][O2] ✘
ON [O2] ✘✔
02 00 Example 2 OFF
[O] [O2]✔
ON [OI] [O2]✔
01 OFF [O][O2]✔
ON [O2 ✘✔
—02OFF [O] [O2] ✘
ON Keypad pot. [O2]✘
03 OFF [OI][O2]✘
ON Keypad pot. [O2]✘
04 OFF [O2]✘✔
ON Keypad pot. [O2]✘
A006A005[AT]External Frequency 
Command InputTrim Frequency 
Command InputReverse avail.
(bipolar input)
00 —
(not 
assigned 
to any input 
terminal) [O2]
✘✔
01 — Summation of
[O] and [OI] [O2]
✘
02 — Summation of
[O] and [OI] [O2]
✔
03 — Summation of
[O] and [OI] ✘✘

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							SJ7002 Inverter
Operations
and Monitoring
4–65
The examples below show how the use of the [AT] input during operation enables/disables the 
Trim Frequency Command input [O2]—[L]. The [O2] —[L] input may be used alone, or as an 
offset control for the primary analog input.
Wiring ExamplesUsing an external potentiom eter is a common way to 
control the inverter output frequency (and a good way 
to learn how to use the analog inputs). The potentiome-
ter uses the built-in 10V reference [H] and the analog 
ground [L] for excitation, and  the voltage input [O] for 
the signal. By default, the [AT] terminal selects the 
voltage input when it is OFF. Take care to use the 
proper resistance for the  potentiometer, which is
1 to 2k Ω, 2 Watts.
Voltage Input  – The 0–10V voltage input circuit uses terminals [L] and [O]. Attach the signal 
cable’s shield wire to terminal [L] on the inve rter only. DO NOT ground the shield at its other 
end. Maintain the voltage with in specifications (do not apply negative voltage). Normally a 
full-span input level (10V) will give the ma ximum motor frequency. You can use parameter 
A014 to select a lower voltage for full output  frequency (such as using a 5V input signal).
Bipolar Voltage Input  – The -10 / 0 / +10V voltage input circuit uses terminals [L] and [O2]. 
Attach the cable’s shield wire to  terminal [L] on the inverter only. Maintain the voltage within 
specifications. Only apply a negative voltage  if this input is configured for bipolar use.
Current Input  – The current input circui t uses terminals [OI] and [L]. The current comes from 
a  sourcing type transmitter; a  sinking type will not work! This means the current must flow into 
terminal [OI], and terminal [L] is  the return back to the transmitter. The input impedance from 
[OI] to [L] is 250 Ohms. Attach the cable’s shie ld wire to terminal [L] on the inverter only.
[FW] terminal
External frequency  command
[O/OI] terminal [AT] terminal
Actual frequency  command
0
Example 1: Without reverse Example 2: With reverse
Trim frequency  command
[O2] terminal
FOI
FOI + FO2
FO20
FO
0
FO + FO2
[FW] terminal
External frequency  command
[O/OI] terminal [AT] terminal
Actual frequency  command
0
Trim frequency  command
[O2] terminal
FOI
FOI + FO2
FO20
FO
0
FO + FO2
forward
reverse
HO2FMAM
OOILAMI
1 to 2 k Ω, 2WL
H
HO2FMAM
OOILAMI
+ –
0 to 9.6 VDC,
0 to 10V nominal4 to 19.6 mA DC,
4 to 20 mA nominal
See I/O specs on page 4–9.
+ –
-10 to 9.6 VDC,
0 to 10V nominal
Standard Voltage Input Bipolar Voltage Input Current Input
HO2FMAM
OOILAMI
HO2FMAM
OOILAMI

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							Analog Output Operation
Operations
and Monitoring
4–66
Analog Output Operation
In the system design for inverter applications it  is sometimes useful to monitor inverter opera-
tion from a remote location. In some cases, this requires only a pane l-mounted analog meter 
(moving-coil type). In other  cases, a controller device such as a PLC may monitor and 
command the inverter frequency and other function s. The inverter can transmit the (real-time) 
output frequency, current, torque, or other para meters to the controller to confirm actual 
operation. The monitor output term inal [FM] serves these purposes.
[FM] TerminalThe inverter provides an analog/digital output on 
terminal [FM] (frequenc y monitor). It uses 
terminal [CM1] as digi tal GND reference. While 
many applications use this terminal to monitor 
the output frequency, you  can configure terminal 
[FM] to transmit one of several parameters. 
Most use pulse-width modulation  (PWM) to 
represent the value, while one parameter uses 
frequency modulation  (FM) to represent the 
value. Do not confuse the notation for terminal 
[FM] (with brackets) with FM signal type.
The following table lists the configurations for  terminal [FM]. Use function C027 to configure.
Note 1: Display substitutes only during sensorless vector control, 0Hz domain sensorless 
vector control, and vector control
PWM Signal TypeThe pulse-width modulated  signal at terminal 
[FM] is primarily designed for driving a moving-
coil meter. The pulse-width modulated signal is 
automatically averaged by the inertia of the 
moving-coil mechanism—converting the PWM 
signal to an analog repr esentation. Be sure to use 
a 10V full-scale DC voltmeter.
The signal characteristic s of terminal [FM] in 
PWM signal configuration is shown below
Func.CodeDescriptionWav e fo r mFull Scale Value
C027 00 Output frequency PWM 0 – Max. frequency (Hz)
01 Output current PWM 0 – 200%
02 Output torque *1 PWM 0 – 200%
03 Output frequency FM 0 – Max. frequency (Hz)
04 Output voltage PWM 0 – 100%
05 Input electric power PWM 0 – 200%
06 Thermal load ratio PWM 0 – 100%
07 LAD frequency PWM 0 – Max. frequency (Hz)
D GND Analog/digital Output
See I/O specs on page 
4–9.
HO2FMAM
OOIL
FWTH
PLCP24CM1AMI
HO2FMAM
OOIL
FWTH
PLCP24CM1AMI
+–
0 to 10V,
1 mA
[FM][FM] output value t
T ---
=
Period T = 6.4ms constant (156 Hz) Selects FM type output= [FM] terminal 8-bit gain setting
B081
C27=00, 01, 02, 04, 05, 06, 07
t
10V
0V t
T

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							SJ7002 Inverter
Operations
and Monitoring
4–67
To calibrate the meter reading, generate a full-s cale output (always ON) at terminal [FM]. Then 
use parameter B081(gain setting from 0 to 255) to  adjust the corresponding full-scale reading 
of the meter. For example, when the inverter  output frequency is 60 Hz, change the value of 
B081 so that the meter reads 60 Hz.
TIP:  When using the analog meter fo r monitoring, adjust the meter so it has a zero reading 
when the [FM] output is zero. Then use scale factor B081 to adjust the [FM] output so the 
maximum frequency in the inverter correspo nds to a full-scale reading on the meter.
NOTE: The indicator accuracy af ter adjustment is about ±5%. Depending on the motor, the 
accuracy may exceed this value.
PWM Smoothing Circuit  – Note that 
standard analog output signals are avail-
able on terminals [AM] and [AMI], 
covered in the next section. However, you 
may also wish to smooth the PWM signal 
at the [FM] terminal and convert it to an 
analog signal. The [FM] terminal will then 
generate a relatively stable DC analog 
voltage that represents the output value. 
To do this, use the circuit shown to the 
right. Note the output  impedance of the 
circuit is at least 82k Ω, so the monitoring 
device needs an input impedance of 1M Ω 
or greater. Otherwis e, the impedance of 
the smoothing circuit will cause a non-
linearity in the reading.
FM Signal TypeThe  frequency-modulated  output at terminal [FM] varies its frequency with the inverter output 
frequency (when C027=03). The signal at [FM] uses the parameter A004  Maximum frequency 
setting . For example, if A004 = 60 Hz, then the  maximum signal value at [FM] will be at 
60 Hz. This frequency is digita lly controlled for accuracy, and does not use the B081 gain 
setting when C027=03  (frequency modulation). 
HO2FMAM
OOIL
FWTH
PLCP24CM1AMI
+
–+ –
+
33k
Ω 82k
Ω
Vo l t s
1 μ F
T 1
[FM] Output Frequency ---------------------------------------------------------
=
Selects FM type output
[FM]
T
[FM] Output Frequency 1
T
---
=
C027=03
t
10V
0V 50% fixed duty cycle

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							Analog Output Operation
Operations
and Monitoring
4–68
[AM] and [AMI] 
TerminalsThe [AM] and [AMI] terminals provide signals 
to monitor various invert er parameters such as 
output frequency, output current, and torque. 
The terminals provide these analog signal types:
 [AM] terminal: 0–10V analog output signal
 [AMI] terminal: 4–20mA analog output 
signal
These signals both use the [L] terminal for signal 
return. Eight different inverter parameters may 
be monitored independently at either the [AM] 
or [AMI] terminal, as listed in the table below. 
Use C028 to configure terminal [AM], and C029 
to configure terminal [AMI].
Note 1: Display of torque is possible only during  sensorless vector control, 0Hz domain 
sensorless vector control, and vector control with feedback
The analog signals may need some adjustment for gain or offset to compensate for variances in 
the system. For example, the signals may drive a panel meter and require a full-scale gain 
adjustment. The table below list s the function codes and their descriptions. The [AM] and 
[AMI] terminals have separate  gain and offset adjustments. Note the default values. 
Func.Te r m i n a lCodeDescriptionFull Scale Value
C028 /  C029 [AM] / 
[AMI] 00 Output frequency 0 – Max. frequency (Hz)
01 Output current 0 – 200%
02 Output torque *1 0 – 200%
04 Output voltage 0 – 100%
05 Input electric power 0 – 200%
06 Thermal load ratio 0 – 100%
07 LAD frequency 0 – Max. frequency (Hz)
Func.Te r m i n a lDescriptionRangeDefault
B080 [AM] Gain adjustment 0 – 255 180
C086 [AM] Offset Adjustment 0.0 – 10.0V 0.0V
C087 [AMI] Gain adjustment 0 – 255 80
C088 [AMI] Offset Adjustment 0.0 – 20.0mA 0.0mA
HO2FMAM
OOILAMI
A GND
See I/O specs on page 4–9.
0–10V analog output
4–20mA analog output

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							SJ7002 Inverter
Operations
and Monitoring
4–69
Setting Motor Constants for Vector Control
IntroductionThese advanced torque control algorithms impr ove performance, particularly at low speeds:
 Sensorless Vector Control –  improved torque control at outp ut frequencies down to 0.5 Hz. 
Use A044=03 (1st motor) or A244=03 (2nd mo tor) to select sensorless vector control.
 Sensorless Vector Control, 0Hz Domain –  improved torque control at output frequencies 
from 0 to 2.5 Hz. Use A044=04 (1st motor) or A244=04 (2nd motor) to select sensorless 
vector control, 0Hz domain.
 Vector Control with Feedback –  improved torque control at all speeds, while providing the 
most accurate speed regulation  of all torque control algorithms. Use A044=05 to select 
vector control with feedback.
These three control algorithms require the inverter’s motor constants to accurately match the 
characteristics of the particular motor connected to your inverter. Simply using the inverter’s 
default parameters with the vector control modes may not produce sati sfactory results. The 
auto-tuning procedure desc ribed later in this section is recommended for most applications 
needing vector control. It determines and reco rds the characteristics of the attached motor. 
However, it is possible to enter the motor constants directly if the motor manufacturer has 
provided that data.
After performing an initial au to-tuning procedure for your motor, you have an additional 
option: adaptive tuning. The adaptive tuning pa rameters use the auto-tuning procedure’s results 
as starting values. Then, each time the motor runs normally in your application, the inverter 
tunes the parameters again to match the motor.  This compensates for temperature changes, etc., 
further optimizing the values.
The following table lists the parameters associated with motor constant settings. Function H002 
selects the set of motor constants that you want  the inverter to use in normal use. Standard 
constants (select with H002=00) include H020  to H024. Auto-tuned constants (select with 
H002=01) include H030 to H034. Remember that you have to do the auto-tuning procedure in 
this section before using either auto-tuned constants or the adaptive mode (H002=02).
Func.NameDataNotes
A044 /
A244 / A344  V/f characteristic curve selection, 
1st / 2nd / 3rd motors 00 V/f constant torque
01 V/f variable torque
02 V/f free-setting curve
03 Sensorless vector control (SLV)
04 Sensorless vector control, 0Hz domain
05 Vector control with encoder feedback
H002 Motor data selection, 1st  motor 00 Standard  motor parameters
01 Auto-tuning parameters
02 Adaptive tuning parameters
H003 Motor capacity, 1st motor 0.2 – 75,
0.2 – 160kW, up to –550xxx models
kW, –750xxx to –1500xxx models
H004 Motor poles setting, 1st motor 2 / 4 / 6 / 8 Units: poles
H020 Motor constant R1, 1st  motor 0.000–65.53 Units: ohms
H021 Motor constant R2, 1st  motor 0.000–65.53 Units: ohms
H022 Motor constant L, 1s t motor 0.00–655.3 Units: mH
H023 Motor constant Io, 1s t motor 0.00–655.3 Units: A
H024 Motor constant J, 1st motor 0.001–9999
Units: kgm
2
H030 Auto-tuned constant R1, 1st motor 0.000–65.53 Units: ohms

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