SX
™
Service and Maintenance Manual 3-42 960714-02B © 2007 I2407
SECTION 3 – COMPONENT REPAIR
ELECTRICAL COMPONENTS
RED RELAY 24V (con’t)
6. Plug machine in and turn on.
7. Cycle the machine with the printer enabled.
Observe the LED on top of the Relay. If the
LED does not momentarily illuminate, check
the wiring on pins 3 and 4. If wiring is OK,
inspect GPIO connector for damage (Figure 3-
112).
8. Cycle machine with printer enabled again.
Observed input LED X7 on the PLC. If LED
does not momentarily illuminate, check wiring
of pin 2.
9. If all wiring is functional, relay is defective.
USE EXTREME CAUTION WHILE SERVICING A
MACHINE WHILE POWER IS APPLIED.
UNEXPECTED MACHINE STARTUP CAN
CAUSE SERIOUS INJURY.
WARNING
DO NOT ATTEMPT TO SERVICE THE MACHINE
DURING NORMAL OPERATION. KEEP HANDS
AND ARMS CLEAR OF MOVING PARTS.
WARNING
WHEN TESTING ELECTRICAL COMPONENTS
WHILE POWER IS APPLIED TO THE MACHINE,
USE PROPER TROUBLESHOOTING
TECHNIQUES TO AVOID ELECTRICAL SHOCK.
WARNING
GPIO
Port
Figure 3-112. GPIO Location