TOSHIBA
11.4
Calibration of Remote Meters
Many times an application requires that a frequency meter (FM) or ammeter (AM) be
remotely located. Attachment and calibration of a remote meter is an easy procedure.
The meter leads should be connected to the appropriate terminals while observing
correct polarity. The calibration of the meter is performed with the inverter keypad while
observing the meter. The meter should be zeroed with the set screw before calibrating.
If the meter is not visible from the inverter site, then the meter should be viewed
periodically as the keypad is adjusted. Also, the meter can be connected through a
temporary length of cable for easy viewing. This temporary cable should be the same
size and length as the permanent cable.
Use the following diagram for connecting a Frequency Meter (FM):
11 - 3
Terminal Connection (FM)
CC
FM
+
-
Frequency
Meter
Zero adjust
screw
Note: Use a 1mAdc ammeter or
7.5Vdc voltmeter. Connect the meter
across terminals FM-CC. Use shielded
cable (1000 ft. maximum length).
Use the following procedure to calibrate the (FM) meter:
1)
Start the inverter to output a run frequency such as 60 Hz
2)
Press "down" key while pressing CLEAR/RESET key to display
3)
Press the RUN key to display
4)
Adjust the analog meter reading to match the digital display reading by pressing
the "up" or "down" keys.
5)
Press the READ/WRITE key to store this setting to non-volatile EEPROM
memory.
6)
Press the CLEAR/RESET key to return to the normal frequency display
Although the above procedure shows calibration of the remote meter at a running
frequency of 60Hz; better resolution of the meter can be obtained if the inverter is
running at the maximum frequency.
The motor load should be disconnected for
FM calibration at the highest frequency.
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