MSRD 2.5 switching unit
Rotary current 400 volt, fan
Design
Plastic housing, protection type IP 41.
Protective insulation in accordance with VDE, plate with symbols for switching positions, incoming power and protective conductor terminals, main contactor, control switch with the functions “Off/Speed 1/Speed 2”, control fuse, operating light (goes out when there is a fan mal- function and/or power interruption to the switching unit), motor output terminals, connection terminals for thermal contacts and room thermostat.
Switching on again after a problem
Each time the power supply is interrupted or the fan malfunctions, the fan reset button has to be pressed once.
Switching and wiring diagram
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| 1 | 3 | 5 | 7 | 9 11 | 13 | 15 | 17 | |
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| 2 | 4 | 6 | 8 | 10 12 | 14 16 18 | |||
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0 |
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D |
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U |
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Group switching
The switching unit is suitable for group switching. Sev- eral motors wired the same way can be connected to one switching unit.
The total capacity of the connected motors may not ex- ceed the permissible switch capacity of the switching unit. The thermal contacts of all motors are to be con- nected in a row.
Important information about safe operation
Grounding and earthing or protective wiring and fuse protection must be done by the customer in accordance with the requirements of the VDE as well as the respon- sible EVU.
The electrical unit connections must be performed by authorised personnel in the line with the valid require- ments in compliance with local laws and in accordance with the wiring diagrams.
Thermal protections
for 2 units
R1 | Thermal protection |
for 3 units |
0U D
S1 | 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 |
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| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
1 3 5
K1
13
14
Thermal protection
for 4 units
Connect other thermal
contacts in a row
| K1 | 2 | 4 | 6 |
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| A1 |
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| 4 | 1 | 2 |
| PE L1 L2 L3 | N |
| PE U1 V1 W1 U2 V2 W2 | TK TK | RT RT | 4 | 3 | 4 | |||||||||||
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| 4 | 5 | 6 | ||||||||||||||||
| 1 | 2 | 3 | 4 | 5 |
| 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |||
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| Incoming power |
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| Motor 3~ |
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| Thermal | Room thermostat |
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| 400V/3/N/PE 50HZ |
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S1 | Control switch | K1 | Switch contactor |
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| PTC element |
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F1 | Control fuse |
| H1 | Operating light |
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