User manual

CompAir BroomWade Limited
page 16
6. REGULATION SYSTEM
6.1 Description
The compressor is regulated through a combination
of electronic, pneumatic, electrical and mechanical
devices. Two modes of regulation are used: ‘On/
Off’ is fitted as standard, and ‘Modulating’ as an
optional extra.
6.2 On/Off Control
In the ‘On/Off’ mode, the compressor is regulated
by the pressure transmitter, which continuously
monitors the pressure in the user’s pipework, a run-
on time sequence within the controller and an
unloader solenoid valve.
The compressor operates in response to varying air
demand in either the on-load condition with the
suction regulator inlet valve fully open, or off-load
with the inlet valve fully closed.
When the controller switches the compressor to run
off-load, a run-on time sequence is activated. This
allows the compressor to run for a pre-set
(adjustable) period of time in the off-load condition.
If this time elapses before the pressure in the
user’s pipework has fallen to the lower set point,
the compressor stops and enters the ‘Standby’
condition.
The compressor will remain in the ‘Standby’
condition until the pressure transmitter senses that
the pressure in the user’s pipework has fallen to the
lower set point. The controller will then re-start the
compressor.
If the pressure in the user’s pipework falls to the
lower set point before the run on time has elapsed,
the controller will re-initialise the time sequence
and switch the compressor to run on-load.
8. Separator Filter
9. Pressure Relief Valve
10. Separator Vessel
11. Air-end
12. Drive Motor
13. Intake Pressure Switch
14. Air-end Discharge Temperature Sensor
1. Air Intake Filter
2. Suction Regulator
3. Venting Valve
4. Unloader Solenoid Valve
5. Minimum Pressure/Non-return Valve
6. Pressure Transmitter
7. Aftercooler
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REGULATION SYSTEM – ON/OFF CONTROL