LNS GT 112-E, Instruction Manual

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Chapter 9 TROUBLE SHOOTING GUIDE
9 - 5
GT 112-E
9.3 ERROR MESSAGE DESCRIPTION AND TROUBLE SHOOTING
GUIDE
When an error occurs the corresponding alarm message will be displayed on the HMI screen.
Follow the troubleshooting instructions below to solve the problems and clear the alarms.
To clear the alarm after troubleshooting presses STOP.
If the alarm message remains active please contact LNS or one of its representatives for further
technical assistance.
AL01 Emergency Stop Line is open!
Description
The emergency stop circuit includes:

Emergency stop button on HMI (STP1)

Emergency stop circuit of the lathe

Main circuit-breaker QM1

Contactor K1
During normal operation the contactor K1 is energized and
continuously sending signal to PLC input X10. Whenever
this circuit is open K1 will de-energize and the signal to PLC
input contact X10 is Off.
Sequence of actions:
1. The 220V AC to the servo amplifier is interrupted.
2. All PLC output signals are interrupted except for Y20
(input signal of alarm relay R1).
3. The alarm AL01 is displayed on the HMI screen.
If the relay K8 (DCS relay) is installed press MANUAL button
on the HMI after powering up the bar feeder otherwise this
error message will be displayed.
Trouble shooting
1. Check if the emergency stop on HMI (STP1) is pressed. If yes release it.
2. Check if the emergency stop circuit on the lathe is open. If yes clear all lathe alarms.
3. Check if circuit-breaker (QM1) has tripped. If yes reset it.
4. Check if A1 and A2 of contactor (K1) have 24 VDC.
5. Press “STOP” button on HMI to clear the alarm.