Bevent Rasch RCMU8-MOD User manual

20/11/2018
www.bevent-rasch.com
RCMU8/-MOD
Control unit
Monitoring system MRB
FIRE SAFETY

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Monitoring system MRB – Control unit RCMU8
• Groups A and B work together as a single group and
close the corresponding damper groups, regardless of
which detector in groups A and B was triggered, while
the detectors in group C and group D only affect their
corresponding damper group respectively.
• Groups C and D work together as a single group and
close the corresponding damper groups, regardless of
which detector in groups C and D was triggered, while
the detectors in group A and group B only affect their
corresponding damper group respectively.
• All groups work together and all dampers close, regard-
less of the triggered detector.
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 detec-
tor loops. The RCMU can even be made to enter alarm
operation mode for the A+B group and the C+D group via
an external incoming alarm.
Alarm functions
Operating parameters are easy to change as they are pro-
grammed in a so-called EEPROM. Control unit RCMU 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
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 8 dampers and 8 smoke detectors
split into four 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 four groups,
A to D, for connecting up to 2 dampers and 2 detectors in
each group.
The RCMU8 can either 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, con-
trol and monitoring. RCMU8-MOD is used to connect to
Modbus. Function tests can also be initiated by an external
switch. During the test, damper groups A+B are tested first
then C+D. The RCMU has electronic circuits that automati-
cally connect outputs with connected damper actuators.
By setting a microswitch, a so-called DIP switch, you can
determine the effect of the smoke detectors as follows:
• The four detector groups A-D only affect their corre-
sponding damper group.

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Monitoring system MRB – Control unit RCMU8
Operating indicators
34 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 RCMU is
functioning independently and is not connected to
a network
- Lit 2 s/off 0.5 s during normal operation when the RCMU
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
(both 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 dampers connected to groups A+B
and then groups C+D are function tested. After the test the
RCMU8 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 or 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 RCMU is connected in a network to a minimas-
ter RCMM, the RCMM determines which functions the
RCMU is to perform. In the case of a network fault during
operation the RCMU will enter alarm mode and the main
alarm will be triggered.
Use RCMU8-MOD to connect to a Modbus network. The
network can have free topology and the following informa-
tion can be transferred:
• Status of RCMU8-MOD
• Which outputs have connected dampers
• Damper faults with detailed causes
• Detector faults and detector alarms
• Service alarms
Furthermore, the following options are available for con-
trolling RCMU8-MOD Modbus-based equipment:
Remote reset | Function test | External alarm | Night
operation

4
Brand-/Brandgasspjäll BSKC6 EI60
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Monitoring system MRB – Control unit RCMU8
External alarm
There are two inputs for external alarms: one for alarm op-
eration of group A+B and one for group C+D. If connected
to a network the minimaster is used to control this.
External alarm
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 RCMU8
-”- RCMU8-MOD - for connection to Modbus network
ACCESSORIES:
RCKD/-RD - Smoke detectors
Specification
Technical data RCMU8-MOD
Supply voltage: 230 V AC +10% -15%, 50 Hz
Power rating: 75 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: 500 mA tube fuse, delay
EMC: EN 50081-1 (1992)
EN 50082-2 (1995)
Technical data RCMU8-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
BORÅS Tel +46 (0)33 - 23 67 80 STOCKHOLM Tel +46 (0)8 - 54 55 12 70
Monitoring system MRB – Control unit RCMU8
Block diagram RCMU8, RCMU8-MOD
Detector group
Main
alarm A
Damper fault
Detector alarm
Detector fault
External alarm
System fault
Communication fault
Power failure
Dirty detector
Opt. comm. bus
230V AC
Air handling unit
External alarm A+B *)
External alarm C+D *)
External func. test/Reset ext. alarm *)
Night operation *)
*) Not with network connection
Main
alarm B
Damper group
Detector group Damper group
Detector group Damper group
Detector group Damper group
Weight 2,2 kg
Dimensions and weight
250
175
1 cpl M20 (6-12 mm)
TEST
ÅTERSTÄLL
75
16 cpl M12 (3-6,5 mm)
RCMU 8
DRIFT
DRIFT VENT
NATTDRIFT
FUNK.TEST
EXT. LARM A+B
EXT. LARM C+D
GRUPP A
GRUPP B GRUPP C GRUPP D
SPJÄLL 1 LÄGE
SPJÄLL 1 FEL
SPJÄLL 2 LÄGE
SPJÄLL 2 FEL
DETEKTORER FEL
DETAKTORER LARM
DETEKTORER SERVICE

6
Brand-/Brandgasspjäll BSKC6 EI60
BORÅS Tel +46 (0)33 - 23 67 80 STOCKHOLM Tel +46 (0)8 - 54 55 12 70
12-0540_ENG / Nov. 2018 teamfront.se
Wiring diagram RCMU8, RCMU8-MOD
Thermal
sensor
dF2
dF1
1
2
Actuator
64112
*) 24V AC max. 10VA
When separate
thermal sensor is
used, connect in
series with motor.
3
6
1
3
6
1
3
6
1
3
6
1
36 1
36 1
***) With duct-
detector RCKD
**) With room-
detector RCRD
Detector 1)
group A
Damper group A 2)
damper 1
Damper group A 2)
damper 2
Actuator *) Actuator *)
**) With room detector
RCRD connected in series
***) With duct detector
RCKD connected in series
Detector 1)
group B
Damper group B 2)
damper 1
Damper group B 2)
damper 2
Actuator *) Actuator *)
***) With duct-
detector RCKD
**) With room-
detector RCRD
Conn.
box
Conn.
box
Conn.
box
Conn.
box
***) With duct-
detector RCKD
**) With room-
detector RCRD
***) With duct-
detector RCKD
**) With room-
detector RCRD
Detector 1)
group C
Damper group C 2)
damper 1
Damper group C 2)
damper 2
Group AGroup BGroup C
Group D
Actuator *) Actuator *)
Actuator *) Actuator *)
Detector 1)
group D
Damper group D 2)
damper 1
Damper group D 2)
damper 2
DIP switch
X-conn. A+B
X-conn. C+D
X-conn. A+B+C+D
Delay air handling unit.
Delay function test 12 h
ON
12
0
34 5
Max. 2 detectors per group (tot. 8
detectors per RCMU). 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.
1)
50 49
Network
connection
(BUS)
3)
52 5351
Main alarm:
Fault in detector loop
Triggered detector
Damper fault
External alarm
Power failure
System fault
Communication fault BUS
55 5654
6)
Detector
Service alarm
58 57
Operation
air handling
unit
3)
42 41
External
func. test/
Reset
ext. alarm
5)
44 43
External
inc. alarm
A + B
4)
46 45
External
inc. alarm
C + D
4)
48 47
Night
operation
7)
The damper output is 24 V AC, max.
10 VA per actuator. Low current contacts
are used for position indication.
Break between terminals triggers alarm.
Jumpered at factory. Not used with
network connection.
2)
4)
Potential free contact max. 24 V AC, 3 A.
Shows potential free/alarm mode.
3)
Function test/Reset ext. alarm in
case of short circuit. Not used
with network connection.
5)
Potential free contact 24 V AC, 3 A.
Shows potential free/normal mode.
6)
Night operation in case of short circuit.
Not used with network connection.
7)
Monitoring system MRB – Control unit RCMU8