Why does the emergency stop not reset the HMI?

a. Emergency stop activated

To do:

1. Check emergency stop wires & -buttons, acknowledge alarm
2. Establish safe condition and reset emergency stop

Why does the steam-valve not close when stop or emergency stop is activated?

a. Defective control system

To do:

1. Check system according to electrical diagram

Chain does not stop in case stop or emergency stop is activated (Only if it is connected to external chain drive)

a. Emergency stop circuit has not been connected to external chain drive

To do:

1. Connect emergency stop circuit to external chain drive

b. Defective control system

To do:

1. Check system according to electrical diagram
2. Defective control system
3. Check system according to electrical diagram