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Electrical
Troubleshooting Guide
IRB6400 M94A
Page 7 - 6
Power Unit Circuitry
7.4
KM3
The KM3 relay is thought of as a motors off relay,
because it is only energized when the motors are OFF.
If it is not energized when trying to start the motors, KM1
and KM2 will not pull in, preventing power from getting
to the drive system.
KM3 should be energized when the main disconnect is
turned on.
-
24 VDC goes through KM2 normally closed contacts
12 and 11.
-
Then through KM1 normally closed contacts 12
and 11.
-
Then 24 VDC goes through KM4 normally closed
contacts 21 and 22.
-
To XS3/XT3 terminal C1.
Between C1 and C2 is a place for the customer to wire
into the motors hold off circuit.
This circuit can only be used to keep the motors OFF,
if they are already OFF. KM3 must be de-energized
before motors are shut OFF. This circuit will NOT stop
the motors. This circuit is usually used with the system
input "HOLD".
If this circuit is not used then a jumper is required
between XS3/XT3 terminals C1 to C2.
24 VDC will then go to KM3 terminal A1 causing KM3 to
energize. It is important to note that KM3 will not
energize unless the circuit between XS3/XT3 terminals
D1 and D2 is closed. This connects A2 to 0 VDC.
If this circuit is not being used then a jumper is required
between D1 and D2.
Sheet 9, line 04 ............
Fig. 7-1 ............
Sheet 9, line 10 ............
Sheet 9, line 08 ............
Sheet 9, line 04 ............
Sheet 9, line 01 ............
Fig. 7-2 ............
Sheet 9, line 06 ............
Sheet 9, line 01 ............
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