IMO MRH

28 MRH 18.08.2022
Color
No.
Description
Pin*
Pin function
Connectors for user
P7
Mains power supply 220-240 VAC**
1
2
3
4
PE
N – neutral
L1 – live 1, 230 VAC: OPEN
L2 – live 2, 230 VAC: CLOSE
P5
NO and NC information about actuators position of Service
switch for monitoring purpose ***
1
2
3
4
NC com
NC
NO
NO com
P1
Actuator 1 – position information - internal floating limit
switch **** (hatch position information)
drawn position “CLOSED”
1
2
3
P2
Actuator 2 (only MRH 1120, 1250) – position information -
internal floating limit switch ***** (hatch position infor-
mation)
drawn position “CLOSED”
4
5
6
* Pin numbers counted from top to bottom and left to right.
** The control voltage L1 or L2 to open or close hatch cover should apply max. 6 minutes! This is to ensure by control
system (use actuator`s internal floating limit switches as indication of cover position to cut off the control voltage).
Operating mode for peak load at 25°C ambient: S2 1min.
Operating mode for continuous load at 40°C ambient: S3 5% (example: open in 30s, then wait 9min 30s)
*** Service switch is used during service / repair / maintenance / review of ventilation unit.
1 – Normal operation (recommended ready state): switch shall be in this position during normal operation (NO –
closed contact, NC – opened contact) – WARNING!
0 – Disconnects power SAFETY POSITION (NO – opened contact, NC – closed contact) (during service / repair / main-
tenance…)
2 – Reverse operation of position 1 (NO – opened contact, NC – closed contact) – DANGER! (during service / repair /
maintenance…)
When changing actuator`s direction (means when feeding power is changed from L1 – 0 – L2 or vice versa with service
switch or by the central) the position 0 keep for a minimum time of 15 s (L1  0 or L2  0).