User manual

Industrial Air Division
112920 1163 04
If the compressor element outlet temperature exceeds a
programmed value below the shut-down level, this will also be
indicated to warn the operator before the shut-down level is
reached.
Monitoring components subject to service
The regulator continuously monitors the oil, oil filter, oil separator
and air filter. Each input is compared to programmed time
intervals. If these limits are exceeded, a message will appear on
the display (Fig. 7a) to warn the operator to replace the indicated
component.
Automatic restart after voltage failure
For compressors leaving the factory, this function is made inactive.
If desired, the function can be activated. Consult Atlas Copco.
If activated and provided the module was in the automatic
operation mode, the compressor will automatically restart if the
supply voltage to the module is restored within a programmed time
period.
The regulator has following functions:
Controlling the compressor
The regulator maintains the net pressure between programmable
limits by automatically loading and unloading the compressor. A
number of programmable settings, e.g. the unloading and loading
pressures, the minimum stop time and the maximum number of
motor starts are taken into account.
The regulator stops the compressor whenever possible to reduce
the power consumption and restarts it automatically when the net
pressure decreases. In case the expected unloading period is too
short, the compressor is kept running to prevent too-short standstill
periods.
Protecting the compressor
If the compressor element outlet temperature exceeds the
programmed shut-down level, the compressor will be stopped. This
will be indicated on the control panel (Fig. 7a). The compressor will
also be stopped in case of overload of compressor motor (M1) or
fan motor (M2). 1)
1) Air-cooled compressors only
1.4.1 Electronic regulator (E1-Fig. 2a)
SENSORS/LOADING SOLENOID VALVE
PT20. Pressure sensor, air outlet
TT11. Temperature sensor, compressor
element outlet
TT90. Temperature sensor, dewpoint 1)
Y1. Loading solenoid valve
MOTORS
M1. Compressor motor
M2. Fan motor, compressor coolers
M3. Fan motor, electric cabinet 2)
ELECTRIC CABINET
F1/F6. Fuses
F7/8. Fuses 3)
F21. Overload relay, compressor motor
K11. Auxiliary contactor for dryer 1)4)
K21. Line contactor
K22. Star contactor
K23. Delta contactor
K25. Phase control relay
Q15. Circuit breaker, fan motor
T1/T2. Transformers
1X1. Terminal strip
1X2. Terminal strip, connection to mains
1X3. Terminal strip
1X4. Terminal strip
CONTROL MODULE (E1)
I. Start button
K01. Blocking relay
K02. Auxiliary relay, star contactor
K03. Auxiliary relay, delta contactor
K04. Auxiliary relay, loading/unloading
K05. Auxiliary relay, high/low air pressure
K10. Auxiliary relay, dryer
O. Stop button
S3. Emergency stop button
ON FULL-FEATURE ALSO
C. Capacitors
FO. Fuses
K1. Start relay
M1. Motor, refrigerant compressor
M2. Fan motor
R. Heater
S3. Condensor fan control switch
S6. Thermal overload switch
S7. High pressure shut-down switch 5)
1) Only for Full-feature compressors
2) Only for compressors designed for high temperature conditions
3) Only on 220/230 V compressors, CSA/UL approved
4) Relay not yet mounted
5) TÜV-approved compressors only
Figs. 6. Electrical diagrams