Instruction Manual Breathing Air Compressors
45
Abb. 61 Final pressure switch
OFF max. = 350 bar
a)
OFF min. = 200 bar
In case of readjustment becoming necessary, open cover (2,
Abb. 61). Adjust screw (1) to the required pressure using a 6
mm allen key.
Service switch (optional)
Abb. 62 Service switch
1 = Test
0 = Operate
The switch is labelled S3. It is mounted on the switch box. In
position “0” the compressor operates normally, i.e. the unit
is switched OFF automatically by the pressure switch. In posi
tion “1” the pressure switch F16 is overridden.
Use this switch position for servicing pur
poses only, e.g. checking the blow-off
pressure of the safety valves. The unit will
not shut off automatically when switch is
in this position.
Cycle counter
The cycle counter is mounted in the switch box and labelled
P14 (1, Abb. 36) . It counts the electrical control pulses for the
automatic condensate drain solenoid valve and hence the
accumulated amount of load cycles of the installed oil and
water separator after the last compressor stage.
1 count corresponds to 1 load cycle
(1 pressurization, 1 depressurization).
Oil pressure switch
The oil pressure monitoring ensures that the compressor is
operated with the correct oil pressure. Missing or low oil pres
sure causes the compressor to be switched off and the red
warning lamp (3, Abb. 14) at the instrument panel to be il
luminated. At start, the missing oil pressure is overriden for
40 seconds.
Emergency shutdown
The unit can be shut down with main switch S0 installed in
the switch box.
Electrical connection of the automatic condensate
drain (optional)
For electrical connection of the automatic condensate drain
see the schematic diagram in the annex of this manual. The
automatic condensate drain is an optional extra for all com
pressor units, i.e. the amount of built-in components varies
depending on order.
The factory set condensate drain intervals
are valid for 20 °C (68 °F) air temperature
of the surrounding air. It is possible to
shorten the condensate drain interval
when operating the unit at a higher tem
perature. Adjust the electrical timer as follows.
Adjustment of the condensate drain timer
Standard setting condensate drain
• Drain interval = 15 min.
• Drain period = 6 s.
Adjusting the timer
(units with electric motor)
Timer K10 controls the automatic condensate drain unit.
K10 is an industrial timing relay with 1 single pole, double
throw contact. The drain interval and drain period is set with
controls t1 (1, Abb. 63) and t2 (2).
Switch (3, Abb. 63) is set to the position to start with a pulse.
t1 is factory set to 15 minutes, t2 to a drain time of 6 seconds.
a) Max. possible setting value; for max. allowable value refer to chapter 1., Technical data
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