19/52
Building Technologies
Bus operator unit RMZ792
CE1P3113en
HVAC Products
4 Power supply
03.04.2006
4.3
Power supply via Synco™ controller
•
In exceptional cases, the bus operator unit can also be powered via the service
interface of a Synco™ controller. Because of the additional power consumption of
the bus operator unit, this type of power supply is possible only if the controller is
equipped with no more than 3 extension modules
•
The slide switch at the rear of the bus operator unit must be set to EXT
•
The bus operator unit is to be connected to the service interface of the Synco™
controller using the cable supplied with the unit
S
CE+
G0
G
CE
311
3
A
06
Synco RM...
KNX TP1
45 mA
S1
N1
KNX
EXT
If the bus operator unit is connected while the controller is in operation, the extension
modules might deliver fault status messages. The faults may lead to short-time interrup-
tions of plant operation. The fault status messages must be acknowledged and reset.
4.4 Error
handling
Possible cases are:
Error Cause
/
remedy
Bus operator unit does not start
Bus operator unit is cyclically
restarted
Konnex bus is locked
Operating values of the bus users
are not correctly displayed or
cannot be changed
Backlit display very faint
•
Wrong polarity CE+ / CE–
•
Wrong polarity G / G0
•
Insufficient power supply via Konnex bus
(undersized bus power supply, too low bus
voltage)
•
Wrong slide switch position (KNX / EXT) or
switch in an inadmissible intermediate position
•
RJ45 connector not correctly plugged in (no
contact)
Controller indicates failure of
extension modules, parts of the
plant fail
The slide switch is in the EXT position and the
bus operator unit was connected while the
controller was in operation.
Remedy:
1. Acknowledge the fault status messages and
reset them.
2. Connect the bus operator unit to a controller
with no extension modules
or
switch on the
controller only after the bus operator unit
has been connected.
