Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 24)

2-2 Start Up / Troubleshooting
Before Applying Power to the Drive(s)
❏
1. Verify all inputs are connected to the correct terminals and are
properly torqued.
❏
2. Verify the AC line power at the drive(s) disconnecting device is
within the rated value of the drive(s).
❏
3. Verify the control power voltage is correct (115V AC for the fan).
❏
4. Verify the DBU Overtemperature N.C. contact output is correctly
wired. This normally closed contact output is used to stop the
drive(s) when an overtemperature condition exists. Verify this
interlocking circuit has been wired correctly according to customer’s
application. See
Figure 1.5 on page 1-9 .
Applying Power to the Drive(s)
❏
1. Apply AC power to the drive(s) and control voltage (115V AC) to the
fan of the DBU.
The red DC Power ON LED on the DBU should be on if power is
applied to terminals R, S, T (L1, L2, L3) of the connected drive(s).
See Figure 2.1.
❏
2. If the red DC Power ON LED is not on at this point, refer to the Table
2.A for troubleshooting guidelines.
Start-Up