Bevent Rasch RCBK4-MOD User manual

28/08/2018
www.bevent-rasch.com
RCBK4/-MOD
Control unit
Monitoring system MRB
FIRE SAFETY

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Monitoring system MRB – Control unit RCBK4
A microswitch, a so-called DIP switch marked X-conn., is
used to set the effect of the detectors as follows:
• Either detector group A affects damper group A and
detector group B affects damper group B (position = 0).
• Or both damper groups work together regardless of the
triggering detector group (position = ON).
This enables a single RCBK4 to be used for two independ-
ent ventilation systems.
The detector outputs feature an electronic short circuit
fuse. All connected dampers enter the alarm position in
the event of a short circuit or a break in one of the detector
loops. The RCBK4 can be set to alarm operation mode by
an external incoming alarm.
Alarm functions
Operating parameters are easy to change as they are pro-
grammed in a so-called EEPROM. Control unit RCBK4 has
an output relay main alarm (A alarm) and a service alarm (B
alarm).
The main alarm is triggered in case of:
• Fault in detector loop
• Triggered detector
• Damper fault
• External incoming alarm
• Power failure
• System fault or communication fault (such as test not
performed)
The service alarm is triggered in case of a dirty detector.
Each alarm relay has an alternating potential free contact,
24 V AC, 3 A.
Quick facts
• Up to 4 dampers and 4 smoke detectors
split into two groups
• Indicators for each individual damper
• Optional external incoming alarm
• Night operation function
• Alternating relay contacts for both main
alarm and dirty detector
• Alternating relay to, for example, turn off
unit during function test
• Integrated transformer from 230 V to 24 V
for powering actuators
Function description
The RCMU is an encapsulated microprocessor-based,
intelligent, self-monitoring control unit split into two groups,
A and B, for connecting up to 2 dampers and 2 detectors
in each group. The RCBK4 can act as an independent
control unit and perform automatic function tests every 48
hours after power up/resetting. Or it can be connected in a
network to a minimaster RCMM for centralised registration,
control and monitoring. RCBK4-MOD is used for connec-
tion to Modbus. Function tests can also be initiated by an
external switch. The control unit has electronic circuits that
automatically connect outputs with connected damper
actuators.

3BORÅS Tel +46 (0)33 - 23 67 80 STOCKHOLM Tel +46 (0)8 - 54 55 12 70
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

4
Brand-/Brandgasspjäll BSKC6 EI60
BORÅS Tel +46 (0)33 - 23 67 80 STOCKHOLM Tel +46 (0)8 - 54 55 12 70
Monitoring system MRB – Control unit RCBK4
External alarm
There is an input for an external alarm. If the input is
activated the entire control panel enters alarm operation
mode. If connected to a network the minimaster is used to
control this.
Function test delay
The microswitch marked “Delay func. test 12h” can be
used to delay the function test. In the ON position and
after power up/resetting a function test is performed, with
the next test 12 hours later, followed by a return to every
48 hours. This enables the automatic test to be performed
during the night.
Control unit RCBK4
-”- RCBK4-MOD - for connection to Modbus network
ACCESSORIES:
RCKD/-RD - Smoke detectors
Specification
Technical data RCBK4-MOD
Supply voltage: 230 V AC +10% -15%, 50 Hz
Power rating: 55 VA
Encapsulation class: IP 65
Ambient temp.: 0° – +50°C
Output relays: Potential free, 24 V AC, 3 A,
resistive load
Max. load
per damper output: 10 VA, 24 V AC
Max. detectors
per output: 2 units
Internal fuse: 315 mA tube fuse, delay
EMC: EN 50081-1 (1992)
EN 50082-2 (1995)
Technical data RCBK4-MOD
Interface: RS485 (MODBUS-RTU)
Communication
speeds: 9600/19200 baud, 8 bit,
even parity with termination function
All addresses from 0 to 247.

5
EI60 Brand-/Brandgasspjäll BSKC6
TEST
ÅTERSTÄLL
DRIFT
DRIFT VENT
NATTDRIFT
FUNK.TEST
EXT. LARM
GRUPP A
GRUPP B
SPJÄLL 1 LÄGE
SPJÄLL 1 FEL
SPJÄLL 2 LÄGE
SPJÄLL 2 FEL
DETEKTORER FEL
DETAKTORER LARM
DETEKTORER SERVICE
175
175
1 x M20 (6-12 mm)
72
10 x M12 (3-6,5 mm)
RCBK 4
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Monitoring system MRB – Control unit RCBK4
Block diagram RCBK4, RCBK4-MOD
Weight 1,8 kg
Dimensions and weight
Damper fault
Detector alarm
Detector fault
External alarm
System fault
Communication fault
Power failure
Dirty detector
Opt. comm. bus
230V AC
Vent.unit
External alarm
*)
External func.test/Reset. ext. alarm
*)
Night operation*)
Main
alarm A
Main
alarm B
*) Not with network connection
Detector group
ADamper group
A
24V AC
Detector group
BDamper group
B
24V AC
TEST
ÅTERSTÄLL
DRIFT
DRIFT VENT
NATTDRIFT
FUNK.TEST
EXT. LARM
GRUPP A
GRUPP B
SPJÄLL 1 LÄGE
SPJÄLL 1 FEL
SPJÄLL 2 LÄGE
SPJÄLL 2 FEL
DETEKTORER FEL
DETAKTORER LARM
DETEKTORER SERVICE
RCBK 4

6
Brand-/Brandgasspjäll BSKC6 EI60
BORÅS Tel +46 (0)33 - 23 67 80 STOCKHOLM Tel +46 (0)8 - 54 55 12 70
Monitoring system MRB – Control unit RCBK4
Wiring diagram RCBK4, RCBK4-MOD
Damper 1 Damper 2
Group A
Damper 1 Damper 2
Group B
FUNC
TEST
EXT
ALARM
NIGHT
OPER.
INPUTS
BUS MAIN
ALARM
DET SERV
ALARM
OPER.
AIR H.
UNIT
OUTPUTS
X-connection A+B
Delay air handling unit
Delay function test 12 hr
Group A
Detector
1)
group A
Damper group A
2)
damper 1
Actuator *)
Damper group A
2)
damper 2
Actuator *)
Group B
Detector
1)
group B
Damper group B
2)
damper 1
Damper group B
2)
damper 2
External
function test/
Reset
external
alarm
External
incoming
alarm A+B
Night
operation
Network-
connection
(BUS)
Main alarm:
Fault in detector loop
Triggered detector
Damper fault
External alarm
Power failure
System fault
Communication fault BUS
Detector
Service alarm
Operation
Air handling
unit
X-connection A+B
Delay air handling unit
Delay function test 12 hr
Max. 2 detectors per group (tot. 4
detectors per RCBK4). See product
sheet for series connection. A 2.2 kΩ
terminating resistor is connected to
the last detector in each loop.
If no detector group is connected,
short the terminals with a 2.2 kΩ resistor.
The damper output is 24 V AC, max.
10 VA per actuator. Low current contacts
are used for position indication.
Function test/Reset ext. alarm in
case of short circuit. Not used with
network connection.
Potential free contact 24 V AC, 3 A.
Shows potential free/normal mode.
Night operation in case of short circuit.
Not used with network connection.
Potential free contact max. 24 V AC, 3 A.
Shows potential free/alarm mode
Break between terminals triggers alarm.
Jumpered at factory. Not used with
network connection
3 6 1
3 6 1
**) With room detector
RCRD connected in series
***) With duct detector
RCKD connected in series
*) 24V AC max 10VA
When separate thermal
sensor is used,
connect in series with
motor.
3
6
1
***) With duct-
detector RCKD
**) With room-
detector RCRD
Actuator *) Actuator *)
Connection
box
3
6
1
***) With duct-
detector RCKD
**) With room-
detector RCRD
Thermal
sensor
12-0539_ENG / Aug. 2018 teamfront.se