Hi sir :
Please see the status LED's for Units in te Board(s): LTK 50 ;
a) Normal condition the Led goes out when motor is running and light up when is standby.
b)If malfunction appear: 1) No enabling HAK 2) overcurrent motor 3)fuses B1+B2 bLOWN Test it.
LTK500:
Yellow led:
a) Normal condition the Led goes out when motor is running and light up when is standby.
b) Malfunction on the LT oron the motor one or both diode light up
Red Led:
a) Not enabling LT
b) overcurrent or overvoltage U <80V or >140v LT switch Off temporarily.
c) U <70v or 180v Switch off completely.
Reset or Fuses Blown (burning protection)
Not enabling of the HAK