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Monitoring system MRB – Control unit RCBK4
Operating indicators
19 LEDs are used to present the control unit’s operating
status with, among other features, individual indicators for
each damper and function as follows:
OPERATION is indicated by a green LED as follows:
- Lit during normal operation when the RCBK4 is
functioning independently and is not connected to
a network
- Lit 2 s/off 0.5 s during normal operation when the
RCBK4 is connected to a network
- Lit 0.1 s/off 0.1 s in case of network fault
- Off in case of power failure
OPERATION VENT. - Green LED lit when output relay for
vent. unit is activated.
NIGHT OPERATION - green LED lit in case of activated
input.
FUNC. TEST - yellow LED lit during internal function test.
- Lit 2 s/off 0.5 s during external function test
EXT. ALARM - red LED lit in case of activated alarm input.
DAMPER POSITION - indicated by green LED as follows:
- Lit in open position
- Lit 2 s/off 0.5 s in closed position
- Lit 0.1 s/off 0.1 s in middle position
- Off when damper motor is not connected/overloaded
DAMPER FAULT - indicated by red LED.
Function when LED for DAMPER POSITION is lit with
indicator as above:
- Lit when damper will not open
- Lit 2 s/off 0.5 s when damper will not close
- Lit 0.1 s/off 0.1 s when damper will neither open nor
close
- Lit 0.5 s/off 2 s when damper indicates open and
closed simultaneously
Function when the LED for DAMPER POSITION is off:
- Lit 0.1 s/off 0.1 s in case of overload on one of outputs
(all damper fault LEDs flash).
- Lit 2 s/off 0.5 s in case of motor failure
DETECTORS FAULT - red LED lit for each detector loop
in case of break in detector loop.
- Lit 0.1 s/off 0.1 s for each detector loop in case of
short circuit in detector loop.
DETECTORS ALARM - red LED lit for each detector loop
in case of triggered detector.
DETECTORS SERVICE - yellow LED lit for each detector
loop in case of dirty detector.
Resetting
The RESET button resets all alarms. After activation the
microprocessor performs a self-test, a memory test and an
EEPROM test, all LEDs are lit for a visual test, output relays
are activated and then connected dampers are function
tested. After the test the RCBK4 enters normal operation
mode.
External incoming alarms can be reset remotely by activat-
ing the “External Function Test” input. Other alarms cannot
be reset remotely. Not used with network connection.
Night operation
Via an external switch the panel enters NIGHT OPERA-
TION mode, at which time the dampers close without the
control unit triggering an alarm.
The external switch must be controlled by a time channel
from DUC, a timer or similar device and not from the venti-
lation unit to avoid “self-locking”. Used, for example, during
intermittent operation. Not used with network connection.
Controlling the ventilation unit
If you want to stop the ventilation unit in conjunction with
a function test and in case of alarm operation, there is an
integrated closing relay switch, 24 V AC, 3 A.
A microswitch marked “Delay” can be used to activate
a 5-minute delay on the dampers’ function test if using
an electrically-heated thermobattery. The relay remains
activated throughout night operation. Damper faults do not
affect the above functions.
Network connection
When the RCBK4 is connected in a network to a minimas-
ter RCMM, the RCMM determines which functions the
RCBK4 is to perform. In the case of a network fault during
operation the RCBK4 will enter alarm mode and the main
alarm will be triggered.
Use RCBK4-MOD to connect to a Modbus network. The
network can have free topology and the following informa-
tion can be transferred:
• Status of RCBK4-MOD
• Which outputs are connected to dampers
• Damper faults with detailed causes
• Detector faults and detector alarms
• Service alarms
Furthermore, the following options are available for con-
trolling RCBK4-MOD Modbus-based equipment respectively.
• Remote reset
• Function test
• External alarm
• Night operation
