Service speech
185
Service
4.3
Troubleshooting table
Fault
Measuring point/test
Cause
Remedy
Programming procedure
from pushbutton to
intercom unit
not working.
Long tone (negative
acknowledge tone) at
intercom unit when
programming is complete.
Adjustment protection at
power supply unit 1 7573 is
activated.
Refer to Page
.
Adjustment
protection can only
be deactivated with
the TwinBus power
supply unit 1 7573.
No call signal
from the
modular door station
to all
intercom units on a busline.
Disconnect the three
bus lines from the power
supply unit.
At power supply unit 1 7573
between terminals:
a1 and b,
a2 and b,
a3 and b
the target voltage of 24 V
DC to 30 V DC is not
present.
Thermal fuse of TwinBus
power supply unit 1 7573
has activated.
De-energize power supply
unit 1 7573 – see
page
Power supply unit 1 7573
defective.
Replace power supply unit
1 7573.
Re-connect the three
bus lines to the power
supply unit.
At power supply unit 1 7573
between terminals:
a1 and b,
a2 and b,
a3 and b
the target voltage of 24 V
DC to 30 V DC is not
present.
LED 7 briefly goes off when
the bus line is connected to
a and b.
Short-circuit in TwinBus
line.
Remedy short circuit.
Call signal not
programmed.
See “Start-up” in chapter
entitled “Installation:
assembly, connection and
start-up” for relevant
intercom unit.
The target voltage of 24 V
DC to 30 V DC is not
present at the intercom
units between a and b.
Open circuit in TwinBus
line.
Check and repair line.
LED 2 not illuminating when
button pressed.
No call signal being
transmitted by button
modules.
Check bus connection in
door station (observe red
mark).
Module carrier is wrongly
connected. (connecting
terminals must be beneath
door intercom module
1 4760).
Wrong button modules
used (from Elegant series,
art.no. 1 5751 - 1 5754).
Содержание TWINBUS
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