OS.74 explosion protection design

1

Protection device Pepperl + Fuchs KFD2-GUT-Ex1.D (see operating instructions of Pepperl + Fuchs for the legend to the numbers inside the protection device)

OFC

Oil flow control system

B1

Oil thermostat

B2

Control unit

B3

Thermostat at the ECO suction line

F1

Main fuse

F2

Compressor fuse

F3

Control circuit fuse

F4

Oil heater fuse

F5

High pressure switch

F6

Low pressure cut-out

F7

Oil flow switch

F8

Oil level switch on the oil separator

F12

Pressure switch (ECO)

F13

Thermal overload relay “motor”

F16

Rotation direction monitoring

F17

Control transformer fuse

F18

Oil level switch of the reservoir for the oil barrier

F23

Fuse of the flow direction monitoring

H1

Signal lamp “motor failure” (excess temperature/phase failure)

H3

Signal lamp “oil flow fault”

H4

Signal lamp “oil level fault”

H7

Signal lamp “wrong rotation direction”

J1

Section switch amplifier Pepperl + Fuchs KFD2-SR2-Ex1.W (1 connection) / KFD2-SR2-Ex2.W (2 connections)

K1

Main contactor

K2

Delta contactor

K3

Star contactor

K4

Auxiliary contactor

K2T

Time relay “Pause time”

K3T

Time relay (star-delta)

K4T

Time relay “Oil level monitoring”

M1

Compressor

M3

Motor

Q1

Main switch

R1

Oil heater

R2

Discharge gas temperature sensor

S1

Control switch (on/off)

S2

Reset “discharge gas temperature” / “oil flow”

T1

Control transformer

T2

Voltage supply for protection device

Y1

Solenoid valve “oil injection”

Y2

Solenoid valve “liquid line”

Y3

Solenoid valve “shut-down bypass”

Y6

Solenoid valve “Capacity regulator CR1 + CR2” (for OS.(A)7451-EX .. OS.(A)7471.-EX)

Y7

Solenoid valve “Capacity regulator CR1 + CR2” (for OS.(A)7441-EX)

Y8

Solenoid valve “ECO” (if required)