CSD Series
Variable Frequency AC Drive
MOTORTRONICS
- 63 -
8.3.1 Mega Test
Check for tightness of electrical connections, discoloration or other
signs of overheating. During service inspection, turn off AC main circuit
power and wait for charging indicator LED 101 to extinguish (or at
least 10 minutes) before touching any circuit components. Failure to
adhere to this warning could result in serious or lethal injuries.
1. Clean up internal dust and dirt
2.Check for tightness of electrical connections.
3. Do Mega test
a. Remove all connection wires from the complete unit when doing
the Mega test.
b. Connect all T & L leads together with jumper wire.
c. Mega test can only be applied on main circuit.
Note: Never do the Mega Test on control circuit. The
insulation resistance of DC500V tester should be more than
5M ohm after completing this test.
d. After completing test, remove jumpers installed in step (b).
e. Reconnect all removed wires in step (a).
8.3.2 Ground Fault Protection When Motor is Running
If a “ground fault” occurs while motor is running, transient surge currents
will destroy the power section of CSD. The CSD offers an optional
ground fault protection unit to detect the surge current and disable the
output section whenever ground fault occurs.
Installation:
1. Disconnect the CSD from power source.
2. Make sure that charge lamp (LED 101) extinguishes and wait for
at least 10 minutes before taking next step.
3. Thread output line (T1, T2, T3) through ground fault current
transformer and connect ground faulT current to CON 4 (as shown
on diagram).
4. Be sure to thread all T1, T2 and T3 through ground Fault current
transformer.
*Max cross section of T1, T2 and T3 should < 7mm.
Note: Ground fault is standard on 230V, 5Hp and above, on 460V,
7Hp and above, and on all 600V units.
8.3.3 Fuse Replacement
CSD drives with 240VAC > 2 HP and all 480 VAC have a DC Bus line
fuse. If the fuse opens due do a fault condition on the output of the
drive, care must be used in replacing the fuse.
ONLY USE THE EXACT
FUSE IN REPLACEMENT! MAKE SURE THE DC BUS IS TOTALLY
DISCHARGED BEFORE REPLACING THE FUSE! FAILURE TO
OBSERVE STANDARD SAFETY PRECAUTIONS COULD RESULT
INJURY OR DEATH!
Once the DC fuse is replaced, perform the trouble
shooting procedures in Section 8.2 prior to energizing the drive.
Figure 8 - 2
Mega Test
Figure 8 - 3
Ground Fault Connections
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