OS.53 .. 74 with SE-B*, Y/Δ start

Open drive screw compressors OS.53 .. 74 with protection device SE-B* and star-delta 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.
Open drive screw compressors OS.53 .. 74 with protection device SE-B* and star-delta 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.

Last revision of the diagram:

13.04.2022

Abbr.

Component

B01

Compressor protection device

B02

Discharge gas / oil temperature sensor

B10

High pressure switch

B11

Low pressure switch

B24

Oil thermostat

B32

Oil level switch at oil separator

B42

Oil flow switch

B53

ECO switch-on

B60

Overload protective device

B62

Rotation direction monitoring

C03

Electrolytic capacitor

E01

Oil heater

F01

Main fuse

F02

Compressor fuse

F03

Control circuit fuse

F05

Fuse of oil 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

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

M17

SV for standstill bypass

M20

SV for liquid line

M40

SV for oil injection

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: