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Power Unit Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
7.3 KM2
The KM2 relay is the end of Run Chain 2.
If Run Chain 2 is closed and the computer has no faults
then 0 VDC will go through KM3 contacts to terminal A2.
(A1 and A2 are the terminals of the coil of KM relays.)
The A1 terminal is connected through the transformer
temperature switch to 24 VDC. If the transformer gets
too hot, the switch will open causing KM2 to de-
energize.
The KM2 relay has 6 sets of normally open contacts and
2 sets of normally closed contacts:
Normally OPEN contacts 44 and 43 are used to latch/
bypass KM3 relay contacts 43 and 44.
Normally OPEN contacts 7 and 8 are used along with
KM1 and KM4 contacts to release the brakes on the
robot.
Normally OPEN contacts 33 and 34 connected to
XS3/XT3 terminals B13 and B14 are supplied for the
customer to use to indicate when KM2 is energized.
Normally OPEN contacts 1, 3, 5, and 2, 4, 6 are the
power contacts on KM2. 262 VAC is on contacts 1, 3,
and 5 when KM1 is energized. When KM2 is energized,
262 VAC will go out contacts 2, 4, and 6 then to the drive
system.
Normally CLOSED contacts 11 and 12 along with
KM1 contacts are used to tell the system board that the
KM relays are not energized.
Normally CLOSED contacts 21 and 22 are used to
bypass the Motors Hold Off circuits on XS3/XT3 terminal
C1 and C2.
Sheet 9, line 07 ............
Fig. 7-1 ............
Sheet 9, line 07 ............
Sheet 9, line 09 ............
Sheet 9, line 10 ............
Sheet 9, line 19 ............
Sheet 9, line 10 ............
Sheet 9, line 09 ............
Sheet 9, line 09 ............
Fig. 7-2 ............
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