OS.53 .. 74 with SE-B*, Y/Δ start
The polarity of the orange connection cables on the SE-B* protective device must be determined with a measuring device.
In grey: options and components that are included in the scope of delivery of the oil separator.
(1): If the star-delta switching time exceeds 2 s, a time relay with max. delay time 2 s must be used instead of the normally open (NO) contacts Q03/15 in paths 17, 18 and 19.
For OS.53:
Correct direction of rotation for the compressor (viewed from compressor shaft end): clockwise, see also arrow on the compressor.
When looking from the compressor towards the motor, the motor obviously rotates in the opposite direction (counter-clockwise).
For OS.74:
Correct direction of rotation for the compressor (viewed from compressor shaft end): counter-clockwise, see also arrow on the compressor.
When looking from the compressor towards the motor, the motor obviously rotates in the opposite direction (clockwise).
Last revision of the diagram:
13.10.2025
Abbr. | Component |
|---|---|
B01 | Compressor protection device |
B02 | Discharge gas temperature sensor |
B03 .. 08 | Temperature sensors in motor windings |
B10 | High pressure switch |
B11 | Low pressure switch |
B14 | Additional protection device for oil monitoring |
B21 | Optional temperature sensor |
B24 | Oil thermostat |
B30 | Oil level switch |
B32 | Oil level switch at oil separator |
B41 | Oil filter monitoring |
B42 | Oil flow switch |
B50 | High pressure transmitter |
B51 | Low pressure transmitter |
B53 | ECO switch-on |
B60 | Overload protective device |
B61 | Overload protective device for second part winding |
B62 | Rotation direction monitoring |
C03 | Electrolytic capacitor |
E01 | Oil heater |
E02 | Terminal box cover heater |
F01 | Main fuse |
F02 | Compressor fuse |
F03 | Control circuit fuse |
F04 | Fuse of compressor protection device or compressor module |
F05 | Fuse of oil heater |
F07 | Fuse of terminal box cover heater |
F08 | Fuse of rotation direction monitoring |
K01 | Superior controller |
K01T | Time relay for part winding start or for star-delta start |
K02T | Time relay for minimum shut-off period of compressor |
K03T | Time relay for oil supply fault |
K04 | Auxiliary relay for oil monitoring |
K04T | Time relay for oil level switch |
K05T | Time relay for oil supply monitoring |
K06T | Time relay for capacity regulator |
M01 | Compressor motor |
M06 | SV for economiser (ECO) |
M11 | SV for capacity regulator 1, CR1, CR+, CRII-2 or start unloading |
M12 | SV for capacity regulator 2, CR2, CR- or CRII-1 |
M13 | SV for capacity regulator 3, CR3 or CRII-3 |
M14 | SV for capacity regulator CR4 |
M17 | SV for standstill bypass |
M20 | SV for liquid line |
M40 | SV for oil injection |
P03 | Light: time delay is activ |
P04 | Light: oil supply fault |
P05 | Light: compressor fault |
P07 | Light: wrong rotation direction |
P18 | Light: oil filter fault |
Q01 | Main switch |
Q02 | Contactor for first part winding (PW) or main contactor (Y/Δ) or compressor contactor (DOL) |
Q03 | Contactor for second part winding (PW) or delta contactor (Y/Δ) |
Q04 | Star contactor (Y/Δ) |
Q05 | Control transformer fuse |
R06 | Interference suppressor (if required, e. g. from Murr Elektronik) |
S01 | Control switch (on-off) |
S02 | Reset of compressor safety chain |
S18 | Reset of oil filter monitoring |
T01 | Control transformer (example for 230 V, required according to EN60204-1) |
Technical documents for further information: