SB-509-226
5.8 Schematic wiring diagrams OS.(A)74.-EX
Abbr
.
Component
1 Protection device Pepperl + Fuchs KFD2-
GUT-Ex1.D (see operating instructions of
Pepperl + Fuchs for the legend to the num-
bers 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 bar-
rier
F23 Fuse of the flow direction monitoring
H1 Signal lamp “motor failure” (excess temperat-
ure/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
Abbr
.
Component
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)
Tab.1: Legend for schematic wiring diagrams
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