Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 81
Commissioning Procedure Chapter 3
Table 7 - Power Circuit Resistance Measurements
3. If abnormal readings are obtained, see Troubleshooting on page 157.
Voltage Sensing Module
The voltage-sensing module consists of a voltage sensing board and mounting
plate. The voltage sensing board has six independent channels, with different
sized resistors base on voltage range, which convert voltages up to 10,800V
(7.2 kV @ 1.5 pu) down to low voltage levels which can be used by the SMC-50
control logic.
Table 8
shows the input voltage ranges for each of the input terminals on the
voltage-sensing module. This module has been designed to operate at a nominal
input voltage of up to 7200V with a continuous 40% overvoltage. The output
voltages are scaled to provide close to 10V peak for a 140% input voltage at the
high end of each of the voltage ranges.
Software will be used to scale the output to show the correct value on the SMC-
50 front panel display. (See Parameter #169 – MV Ratio)
Table 8 - Input Voltage Ranges
The MV ratios shown above are nominal values and may be fine tuned to achieve
better accuracy on the display of the SMC-50 control module. While running
the motor in bypass mode, compare the voltage displayed on the control module
to a known accurate meter connected to the same source voltage as the motor the
SMC-50 is controlling. Parameter 169, MV Ratio, may be changed up or down to
match the control module display to the external meter. A small change in ratio
can make a large change in the display, so five units at a time is recommended.
Increasing the ratio will decrease the displayed voltage, and visa versa.
Location of Probes 1000V 1300V 1500V 2300V 3300V 4160V 5500V 6900V
Cathode to Cathode
(KOhms)
(1)
(1) Measured between terminals “Cathode” on CLGO Boards, upper two or between two within a phase.
— — — — 22…30 23…31 21…29 24…32
Cathode to Cathode
(KOhms)
(2)
(2) Measured between terminals “Cathode” on CLGO Boards, top to bottom within a phase.
17…23 19…25 20…27 21…29 40…53 43…57 60…90
(3)
(3) Measured between line and load terminals within a phase.
64…84
(3)
Cathode to Gate
(Ohms)
10…40 10…40 10…40 10…40 10…40 10…40 10…40 10…40
Module Rated Voltage Voltage Range MV Ratio
1500 800…1500 1163
2500 1501…2500 582
4800 2501…4800 326
7200 4801…7200 193
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