Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 173
Troubleshooting Chapter 9
8. Tighten the center nut until the indicator washer becomes loose with some
friction. The clamp is now at the proper force and must not be clamped
any tighter. If the indicator washer becomes too loose (no friction), back
the center nut off slowly until the washer is loose with some friction.
9. Replace the shorting bar. Torque hardware to 30 N•m (20 lb•ft). For
3/8 in. hardware in the “T” slots of aluminum heatsinks, the
recommended torque is 22 N•m (16 lb•ft). Do not overtorque these
connections as the slots will be damaged and the connection will be
compromised.
C. Install Refurbished Stack
1. Inspect all connections on the module. Inspect wire insulation and
components for damage.
2. Install the module in the cabinet. Watch for power cables and fiber-optic
cables as module is slid into place. Tighten locking nuts at the bottom of
the module.
3. Connect power cables and tighten hardware to 30 N•m (20 lb•ft).
4. Install gate-driver board, ensuring that the locking tabs on the nylon circuit
board supports are all engaged. Plug in thermistor and gate connectors and
reconnect wires to the left side of the board. Plug in the fiber-optic cables.
5. Replace current loop cable (see Figure 51
). Tighten the terminals at the
current loop power supply to 5.6 N•m (50 lb•in).
6. Make sure all connections are secure. Perform resistance checks according
to instructions on “Thyristor (SCR) Testing” (page 170
), and test gate-
drive circuits by performing power supply tests in Chapter 3 (page 77
).
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