Troubleshooting - Schüco S.B 1956 Manual De Instrucciones

7.
Lock does not unlock
Latchbolt remains in the lock
Lock unlocks automatically
Schüco International KG · Karolinenstraße 1–15 · D33609 Bielefeld

Troubleshooting

Problem Cause
• Missing or faulty power supply
(measure 24 V)
• No + 24 V control signal
• Mechanically blocked
- door leaf or door frame is
twisted or warped
- latch is jamming
- the hardware screws are
pressing on the lock case
• The lock is in programming
mode
• Profile cylinder actuated
INFO: If the cylinder is operated when the motor is in operation, the
lock switches to overload protection and does not respond to control
signals for 20 s!
• No power supply, power failure
in the event of motor-driven
daytime release
• A voltage of 24 V is
permanently applied on the
control line
• Mechanically blocked
• Profile cylinder actuated
• Lever handle permanently
actuated (follower)
• Door contact defective or
jumper missing
S.B 1956; S.B 1959
Remedy
• There must be at least
21.5 V DC at the lock.
Check that the power supply
unit, fuse and cable cross-
sections are sufficiently sized
and replace if necessary
• Check control input
(pin 9/green)
• Check door leaf/frame
• Align or adjust latch striker
correctly
• Check hardware screws,
shorten if necessary
• If the latch is jammed (motor
under short-circuit conditions),
the lock does not respond to
control signals for 20 s
• Exit or abort programming
mode (see point 6)
• Remove the key
• Check cam position when key is
removed (see point 4.1)
• There must be at least
21.5 V DC at the lock.
Check that the power supply
unit, fuse and cable cross-
sections are sufficiently sized
and replace if necessary.
• Actuate lock via profile cylinder
• Check control signal; deactivate
the daytime relase
(see point 4.3)
• See point "Lock does not
unlock"
• Remove the key
• Check hardware
• Check door contact or wiring
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