Siemens E382 EH81E 061 01 03 02 Service Manual page 21

Compressor Compact
5.7 Standby lamp
The yellow STANDBY LAMP will be on only
when the compressor is in standby mode,
i. e. when the 4.1 COMPRESSED AIR
RESERVOIR is supplied with compressed
air from the hospital central gas supply.
The standby function can be described as
follows:
1.With the compressor switched off, connect
compressed medical grade air from the
hospital central gas supply to the 4.5
COMPRESSED AIR INLET. The gas
pressure must be above approx. 300 kPa
(3.0 bar). Switch on the compressor:
– The 3.8 STANDBY PRESSURE SWITCH
detects that the pressure in the reservoir
is above approx 300 kPa (3.0 bar)
– The STANDBY LAMP lights up
– The 3.6 STANDBY SOLENOID VALVE
is automatically set to supply compressed
air from the central gas supply to the
4.1 COMPRESSED AIR RESERVOIR
– The compressor motor is not on, i. e. the
compressor is not active.
2.The compressed air from the central gas
supply is disconnected or the pressure
drops below approx. 300 kPa (3.0 bar):
– The 3.8 STANDBY PRESSURE SWITCH
detects that the pressure in the reservoir
drops and stays below approx. 300 kPa
(3.0 bar) for a few seconds
– The start relay RL4 connects mains
power to the compressor motor. The
compressor starts to work, i. e. the
compressor supplies compressed air
– The 3.6 STANDBY SOLENOID VALVE
is automatically set to supply compressed
air from the compressor to the 4.1 COM-
PRESSED AIR RESERVOIR
– The STANDBY LAMP goes off.
E382 EH81E 061 01 03 02
The compressor will not automatically return
to standby mode if the pressure in the
central gas supply returns.
5.8 Pressure alarm lamp
The pressure alarm is activated if the air
pressure in the 4.1 COMPRESSED AIR
RESERVOIR, detected by the 3.7 LOW
PRESSURE SWITCH, drops and stays
below 280 kPa (2.8 bar) for 10 seconds. This
alarm is indicated by the red PRESSURE
ALARM LAMP and the ALARM BUZZER.
The alarm lamp and the alarm buzzer will
stay on until the alarm is deactivated or until
the compressor is switched off.
The pressure alarm is deactivated when the
air pressure rises above approx. 280 kPa
(2.8 bar).
5.9 Buzzer
The alarm BUZZER gives an audible alarm
indication. The buzzer is active:
• During the first 10 seconds of a tempera-
ture alarm
• During a pressure alarm
• When the 5.4 TEST BUTTON is depressed.
Siemens-Elema AB
Description of functions
21