Electrical
Troubleshooting Guide
IRB6400 M94A
Page 4 - 4
Power On Circuitry
4.2 AC Power Distribution
The Primary Voltage is connected to QS1. QS1 is a 20
amp circuit breaker. When QS1 is turned ON by the
main disconnect handle, the primary voltage goes
through wires labeled T1, T2 and T3. These three wires
are connected to the transformer (TM1) terminals 1, 2
and 3.
The transformer’s input is configured for 480 VAC by
having jumpers from terminals 1 to 25, 2 to 35, and 3 to
15. The transformer's input is configured for 600 VAC
by having jumpers from terminals 1 to 28, 2 to 38, and
3 to 18.
It should be noted that all AC voltages are grounded to
earth ground through terminals 70 and 72.
The output of the transformer puts out several different
AC voltages. They are:
262 VAC is used for the Motor Drive System. It is sent
out from TM1 terminals 42, 52, and 62. Into FS1
terminals 2, 4, 6 (which is a 16 amp circuit breaker.) 262
VAC then goes from FS1 terminals 1, 3, 5. To KM1
terminals 2, 4 and 6 (the MOTORS ON relay.) KM1 is
also the result of Run Chain 1.
230 VAC is sent through fuse FU3 (6.3 amps) terminal
74, then to optional AC accessories. Examples of
accessories include; going through door switch SB3 to
a service light in the control cabinet, a service outlet to
plug in test equipment such as meters or scopes, or
through door switch SB2 to a cooling device (EV4.)
120 VAC through fuse FU2 (6.3 amps) terminal 73,
which can be used for the service outlet XS21 for
customer use.
230 VAC through fuse FU1 (3.15 amps) terminal 71,
which on wire L33 supplies power to the Control Power
Supply GS1:XP1 pin D2.
Sheet 5, line 03 ..............
Fig. 4-2 ..............
Sheet 5, line 12 ..............
Sheet 9, line 8 ................
Sheet 5, line 15 ..............
Fig. 4-1 ..............
Sheet 5, line 11 ..............
Sheet 24, line 01 ............
Fig. 4-1,2 ...........
Sheet 5, line 11 ..............
Fig. 4-1,2 ...........
Sheet 5, line 11 ..............
Sheet 6, line 17 ..............
Fig. 4-1,2 ...........
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