Electrical
Troubleshooting Guide
IRB6400 M94A
Page 4 - 6
Power On Circuitry
DC Power Distribution (Cont)
24 VDC
, named
Brake PB
, is supplied through GS1:XP1
pin D16 to XS\XP18 pin 7 and then to terminal 51 on
KM4 (these are normally closed contacts) on the brake
relay. When the brakes are not being released by KM4,
24 VDC is sent out to the manual brake release push
buttons on the manipulator. 24 VDC from KM4 terminal
52 goes to XS1 pin B16 to the robot connector R1.MP
pin B16, then to the Brake Unit (BU) through cable
R3.BU1-6 connector R3.X8 pin 5. At this point 24 VDC
is supplied to all six brake release push buttons.
24 VDC
is supplied through GS1:XP1 pin Z18, to the
Duty Time Counter
(PT). The 24 volts is only used to
supply power to the timer, not to start timing.
24 VDC
is also supplied to the
Power Unit
, which is the
four relays on top of the swing gate. 24 VDC is supplied
through a temperature switch on the transformer TM1
terminal 90 and 91 then to the coil of KM2 terminal A1.
The 24 VDC will not energize the relay until the 0 VDC
is intact through Run Chain 2.
If the transformer gets too hot, the switch will open,
preventing KM2 from energizing.
24 VDC
in the
Power Unit
will also energize KM3 (the
supervisory relay), by going through normally closed
contacts of KM1 and KM2 terminals 12 and 11. Then
to the System board (DSQC 256A) as MOFF (motors
OFF signal to the computer.)
Beside going to the System board (DSQC 256A), 24
VDC goes through KM4 terminals 22 and 21 (which are
normally closed contacts) to XS3/XT3 terminal C1. At
this point the customer may wire contacts between C1
and C2 as a 'motors hold off' circuit.
If 'motors hold off' circuit is not used, a jumper must be
used between terminals C1 and C2.
From there, 24 VDC is sent to the coil of the KM3 relay.
As long as XS3/XT3 terminals D1 to D2 is closed, KM3
will energize. KM3 will then latch closed through KM1
and KM2 terminal 22 and 21 and through KM3 terminals
13 and 14. 0 VDC (zero volts) is also latched through
contacts KM3 terminals 53 and 54.
24 VDC
is fed to the
Teach Pendant
through the back
plane X32 pin 5 to XS20 pin G in to the Teach Pendant.
This is the only power source for the Teach Pendant.
Sheet 6, line 10 ..............
Sheet 9, line 17 ..............
Sheet 13.1, line 11..........
Sheet 105, line 11...........
Sheet 104, line 01...........
Fig. 4-2,3 ...........
Sheet 9, line 16 ..............
Fig. 4-1 ..............
Sheet 9, line 04 ..............
Fig. 4-1 ..............
Sheet 9, line 12 ..............
Fig. 4-1 ..............
Sheet 7, line 01 ..............
Fig. 4-2 ..............
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