Rockwell Automation Allen-Bradley LiquiFlo 2.0 - Page 226

226 Rockwell Automation Publication D2-3518-4 - January 2020
Chapter 10 Troubleshooting the Drive
4. Disconnect the motor from the drive.
5. Check all AC line and DC bus fuses.
6. If a fuse is open, use a multimeter to check the input diodes and output
IGBTs. See Ta b le 35
and Tabl e 36 .
7. Reconnect the motor to the drive.
8. Reapply input power.
Table 35 - Input Diode Components
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal
Table 36 - Output IGBT Components
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal
Input Diode
No.
Meter Connection Component is OK if
resistance (R) is:
Component is defective if:
(+) (–)
1 * L1 10 < R < 1 megohm Continuity (short circuit) or open
when the meter is connected
with reversed polarity.
2*L2
3*L3
4*L4
5*L5
6*L6
7L1**
8L2**
9L3**
10 L4 **
11 L5 **
12 L6 **
Output IBGT
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
4W/T3**
5 V/T2 **
6U/T1**