Hitachi SJ300 Series Power Supply User Manual


 
Analog Output Operation
Operations
and Monitoring
4–62
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 panel-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 functions. The inverter can transmit the (real-time)
output frequency, current, torque, or other parameters to the controller to confirm actual opera-
tion. The monitor output terminal [FM] serves these purposes.
[FM] Terminal The inverter provides an analog/digital output on
terminal [FM] (frequency monitor). It uses
terminal [CM1] as digital 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 Type The 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 representation. Be sure to use
a 10V full-scale DC voltmeter.
The signal characteristics of terminal [FM] in
PWM signal configuration is shown below
Func. Code Description Waveform Full 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.
H O2
FM
AM
O OIL
FW
TH
PLC
P24
CM1
AMI
H O2
FM
AM
O OIL
FW
TH
PLC
P24
CM1
AMI
+–
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