PLCXSRVerified · sol.ls-electric.com
XSR ES2-4 — ES2 IN2/FAIL LED 4 blinks - K1K2 External Relay Error
Critical — power cycle required
CAUSE
Why does it occur?
IN2/FAIL LED red, 4 blinks: K1/K2 external contactor feedback fault
REMEDY · Step by step
How to fix it?
Check K1/K2 contactor wiring and feedback signal
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Verified · sol.ls-electric.com
Open manual ↗XSR Safety Relay 사용 설명서 (MF2/FB3/OS2/ES2 통합)
3.4 LED 표시 진단