Analog Output Operation - Hitachi CP-X200 Instruction Manual

Analog Output Operation

In inverter applications it is useful to monitor
the inverter operation from a remote location or
from the front panel of an inverter enclosure. In
some cases, this requires only a panel-mounted
volt meter. In other cases, a controller such as a
PLC may provide the inverter's frequency
command, and require inverter feedback data
(such as output frequency or output current) to
confirm actual operation. The analog output
terminal [AM] serves these purposes.
The inverter provides an analog voltage output on terminal [AM] with terminal [L] as
analog GND reference. The [AM] can output inverter frequency or current output value.
Note that the voltage range is 0 to +10V (positive-going only), regardless of forward or
reverse motor rotation. Use C028 to configure terminal [AM] as indicated below.
Func. Code
00
C028
01
The [AM] signal offset and gain are adjustable, as indicated below.
Func.
B080 [AM] output gain adjustment
C086 [AM] output offset adjustment
The graph below shows the effect of the gain and offset setting. To calibrate the [AM]
output for your application (analog meter), follow the steps below:
1. Run the motor at the full scale speed, or most common operating speed.
a. If the analog meter represents output frequency, adjust offset (C086) first, and
then use B080 to set the voltage for full scale output.
b. If [AM] represents motor current, adjust offset (C086) first, and then use B080 to
set the voltage for full scale output. Remember to leave room at the upper end of
the range for increased current when the motor is under heavier loads.
AM output offset adjustment
AM output
10V
C086=0~10
5V
0
NOTE: As mentioned above, first adjust the offset, and then adjust the gain. Otherwise
the required performance cannot be obtained because of the parallel movement of the
offset adjustment.
Description
Inverter output frequency
Inverter output current
Description
Parallel
movement
1/2 FS Full scale (FS)
Hz or A
Analog
Voltage
Output
10VDC
full scale,
1mA max
See I/O specs on page 4-6
Range
0 ~ Max. Frequency (Hz)
0 ~ 200% of rated current
Range Default
0.~255. 100.
0.0~10.0 0.0
AM output gain adjustment
AM output
10V
5V
0
1/2 FS
4 − 57
4 57
AM H O OI L
+ -
A GND
B080=0~255
Full scale (FS)
Hz or A