Rockwell Automation Publication 7000-UM202H-EN-P - November 2023 101
Chapter 2 Power Component Definition and Maintenance
2. Connect one of the SPS test power harness connectors to the SPS J1
connector.
3. Plug the AC input end of the SPS test power harness into the appropriate
drive receptacle.
The green LED (DS1) at the front of the board should be on.
4. Measure between the TP4 and TP6 on the SPS board. It should be at a
level of
ā2 x VIN
RMS
.
This can range from 120V (85V input) to 375V (265V input).
5. Measure between TP15 and TP14 on the SPS board. It should be at a level
of 20V DC, +/- 400 mV.
If these readings are not correct, replace the tested SPS board with a new
board and return the faulty board to the factory.
Always connect the SPS test harness connectors to the SPS board before
applying input power to the SPS test harness.
Certain shorted components on the SPS board, such as any of the input diode
bridge diodes D10, D11, D13 or D14, will cause the input breaker to the SPS test
power harness to trip. In this situation, replace with a new unit and return the
faulty board to the factory.
Self-Powered Gate Driver
Board ā SPGDB
This board is a component in drives using SCRs as the rectifying device on the
input of the drive. The SCRs require a gating pulse to turn on, and this is
achieved by using the SPGDB.
The SPGDB receives signals from the drive processor via a light signal
transmitted through a fiber optic cable. The power source for the SPGDB is
from the SCR snubber network, a Rockwell Automation patented design. This
unique design gives the SPGDB the ability to conserve the amount of energy
that it supplies to the SCR. This reduces the amount of energy required by the
drive to operate, thus making the drive more efficient.
This board also determines the health of the SCR. The SPGDB has the
hardware necessary to diagnose SCR conditions and relay the status to the
processor via a fail-safe light signal along a fiber optic cable.
Board Calibration
This board requires no field calibration.
WARNING: When the SPS test harness is installed and powered, there are lethal
voltages on the SPS board and test harness. Always connect multimeter test
leads to the SPS test points before applying input power to the SPS test
harness. Do not touch the test harness contacts or the SPS board once input
power is applied. Once the test harness is removed, wait 10 seconds before
touching the SPS board.
WARNING: When testing with the SPS harness is complete, remove the test
harness from all of the SPS boards and remove the SPS test harness from the
power converter cabinet. Do NOT leave the SPS test harness in the power
converter cabinet. Reconnect all of the SGCT snubber connections to the J1
connectors on the SPS boards.
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