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8 PARAMETER FUNCTIONS
8-65
8
Pr. 900 "FM terminal calibration"
Using the operation panel or parameter unit, you can calibrate the full scale of a meter connected to
the FM instrument connection terminal.
The terminal FM outputs a 1mADC current at the value set in Pr. 55 or 56. When the full scale of
the meter used must be calibrated, it can be adjusted using Pr. 900.
<Calibration example>
Connect a 1mADC ammeter having a full-scale graduation
"25" and adjust it to deflect to the graduation "20" at the
running speed 2000r/min.
1mADC ammeter
0
20
25
<Calibration procedure using operation panel>
1) Make sure that "2000" has been set in Pr. 55.
2) Confirm that the (+) terminal of the meter is connected to terminal FM and the (-) terminal to
terminal SD.
3) When a calibration resistor is connected on the meter side, adjust it until the resistance value
is "0" or remove it.
4) Set the operation mode to the PU operation mode.
5) Set the running speed to 2000r/min.
6) Press the
SET key.
7) Read Pr. 900.
8) Press the
FWD or
REV
key to start operation. You need not connect the motor.
9) Using the
key, make adjustment until the meter deflects to the graduation "20". Holding
down the
key decreases the current flowing in the ammeter. The key increases the
current.
10) Press the
SET key until Pr. 900 flickers. (About 2s)
11) Press the
STOP/RESET
key to stop operation.
MEMO
Holding down the key increases the current to about 2mA. Check the maximum
rating of the ammeter and make adjustment.
You can also calibrate the meter for external operation. Set the frequency in the
external operation mode and make calibration in accordance with steps 7) to 11).
You can also make calibration during operation.