0148 Safety T4
Used for the monitoring of the landing door contacts KTS. The safety circuit is open before the fourth tap (ISKT4) but after the third tap (ISKT3). The message is logged if:
a) the safety circuit opens during a trip due to a landing door contact (any) which opens unexpectedly.
b) the safety circuit does not close as expected after the door has closed.
Comments: Downward safety circuit tap input (ISKT5) will not create corresponding error message. Refer also to wiring diagram for contacts causing the error.
If this error persists increase the value of the drive parameter 'DOOR_CONTACT-DELAY' to 50 (corresponds to 0.5 s), 70 or 100. This is time the logic waits during startup from the first time the SKD signal 5 (safety end) is received to the moment when the door overbridging is disabled. During this time, the door contacts may bounce. Do not increase the value for this parameter too much because it will further increase the trip preparation timer. More care should be taken to improve the adjustment of the door movement.
