4–13Component Test Procedures
Publication 1336 IMPACT-6.2 – March 1998
Important: Before you remove connections and wires from the
drive components, mark the connections and wires to
correspond with their component connections and
terminals to prevent incorrect wiring during assembly.
1. Remove power from the drive.
2. Check for zero volts at TB1 terminals +DC and –DC.
3. Check for absence of control voltage at:
• TB10
• TB11
• L Option Board (if used)
4. Remove the Main Control Board Mounting Plate. Refer
to Chapter 3 – Disassembly and Access Procedures, Removing
the Main Control Board Mounting Plate.
5. Unplug the connectors from the Gate Driver Board.
6. Set your meter to test resistance.
7. Test Fuses F1 and F3 for an open condition. Replace the Gate
Driver Board if either fuse shows an open condition.
8. Set your meter to test diodes.
9. Test VR1 – VR6. The following table shows meter connections at
the components and ideal meter readings for those connections.
Refer to the former illustration for meter connection locations.
Table 4.D
Gate Driver Board Test
Component
Meter (+) Lead Meter (–) Lead Nominal Meter
Reading
VR1 – VR6 +
–
–
+
1.06
1.8
Important: Typical malfunction is shorted in both directions.
10.Replace the Gate Driver Board if your readings do not match the
table readings. Refer to Chapter 3 – Disassembly and Access
Procedures, Removing the Gate Driver Board.
11. Assemble the drive in reverse order of disassembly.
!
ATTENTION: Replace all guards and insulators
before applying power to the drive. Failure to replace
guards may result in death or serious injury.
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