4–4 Component Test Procedures
Publication 1336 IMPACT-6.2 – March 1998
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 Snubber Board. Refer to Chapter 3 – Disassembly
and Access Procedures, Removing the Snubber Board.
5. Set your meter to test diodes.
6. The following table shows meter connections and ideal meter
readings for those connections. Refer to the former illustration for
meter connection locations.
Table 4.A
Input Rectifier SCR1 Test
Meter (+) Lead
Meter (–) Lead Nominal Diode
Reading
Nominal Ohm
Reading
1
1
1
2
A
B
C
A
Infinite
Infinite
Infinite
Infinite
8 Meg
8 Meg
8 Meg
8.5 Meg
2
2
3
3
B
C
A
B
Infinite
Infinite
Infinite
Infinite
8.5 Meg
8.5 Meg
7 Meg
7 Meg
3
21
21
22
C
22
23
21
Infinite
0.035
0.035
0.035
7 Meg
30
30
30
23
11
12
13
21
1
2
3
0.035
0.035
0.035
0.035
30
15
15
15
7. Replace the Input Rectifier if any meter readings are not as
shown. Refer to Chapter 5 – Part Replacement Procedures, Input
Rectifier SCR1.
8. If the Input Rectifier requires replacement, check the Power
Modules for damage. Refer to Testing the Power Modules in this
chapter.
9. Assemble the drive in reverse order of disassembly.
AB Spares