Hitachi CP-X200 instruction manual Analog Output Operation

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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.

	AM	H	O	OI	L
Analog	+					-
Voltage				A GND
Output

10VDC full scale, 1mA max

See I/O specs on page 4-6

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	Description	Range
C028	00	Inverter output frequency	0 ~ Max. Frequency (Hz)
	01	Inverter output current	0 ~ 200% of rated current

The [AM] signal offset and gain are adjustable, as indicated below.

Func.	Description	Range	Default
B080	[AM] output gain adjustment	0.~255.	100.
C086	[AM] output offset adjustment	0.0~10.0	0.0

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 gain adjustment

and	Inverter
installation	Mounting
Monitoring	Operationsand

AM output

10V

C086=0~10

Parallel

movement

5V

0

1/2 FS	Full scale (FS)
	Hz or A

AM output

10V

B080=0~255

5V

0

1/2 FS	Full scale (FS)
	Hz or A

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.