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Troubleshooting the Drive
6-5
Table 6.1 – Resistance Checks
Input
Diode
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is: Component is defective if:
1 * SCR1 10 < R < 1 megohm Continuity (short circuit) or
open when the meter is
connected with reversed
polarity.
2 * SCR2
3 * SCR3
4 * SCR4
5 * SCR5
6 * SCR6
7 SCR1 **
8SCR2 **
9SCR3 **
10 SCR4 **
11 SCR5 **
12 SCR6 **
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal
Table 6.1 - Resistance Checks (Continued)
IGBT
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is: Component is defective if:
1 * W/T3 10 < R < 1 megohm Continuity (short circuit) or
open when the meter is
connected with reversed
polarity.
2 * V/T2
3 * U/T1
4 W/T3 **
5 V/T2 **
6 U/T1 **
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal