Hydrovane HR04, Руководство пользователя

Страница: 11 / 24

4.0 General Description
_________________________________________________________________________________________
CC1132751C 11
4.0 General Description
4.1 Compressor/Hypac (Fig.4.1)
This manual covers Vertical HR04-HR07 compressors, hypac’s
combine either a receiver, air dryer or both, depending on the
installation required.
A compressor without ancillary equipment is used where air
demand is constant and does not exceed the output capacity of
the unit.
4.2 Control Systems
Compressors can be operated in either automatic stop/start (set
as default) or in continuous operation.
All units benefit from REVS (Reduced Energy Venting System)
and Smart Servo to minimise power consumption during
operation.
On start up a short delay prevents full pressure delivery to
reduce motor power consumed.
With maximum line pressure established the venting system
lowers compressor pressure to provide substantial cost savings
due to the off-load power reduction.
Smart servo control isolates the servo and vacuum valve feeds
during full load operation to reduce losses and maximise
compressor efficiency.
During off-load run on time at minimum pressure the compressor
will either stop with no air demand or return to on-load running if
more air is required.
Automatic Operation
This is the normal operation selected giving maximum efficiency
and economy for applications with fluctuating air demands. The
compressor will load/unload and stop/start automatically in
response to air demand.
Motor restarts are set to 10 times per hour for single speed units
and 30 times for RS units.
Run-on time to stop can be increased to reduce or limit motor
restart frequency to lower levels if required.
Continuous Operation
When in continuous operation the compressor will supply air
from full to zero flow rates. The energy saving benefits of REVS
will not be maintained.
An air dryer is used to provide dry air (pressure dew point
3°C/37°F) for specialised applications.
Where air demand fluctuates a compressor with receiver is used
to store large quantities of air. A dryer can be combined with the
compressor and receiver for applications requiring large volumes
of dry air.
Figure 4.1 shows general views of typical units, the compressor
assembly is detailed in Section 4.3 / Fig 4.2, the air dryer is
supplied with its own manual.
Regulated Speed (RS) Operation
Regulated speed compressors are automatic stop/start operation
only.
The RS compressor saves energy and operating cost when
compared with a fixed speed compressor of similar size. The
saving is achieved by automatically regulating the compressor
speed to precisely match the compressor output to the system
demand.
If the system pressure rises above the unload pressure the
electric motor speed will decrease, conversely, if the system
pressure falls below the load pressure the motor speed will
increase. The speed will vary between load and unload limits
dependent upon system demand.
E ER ED ERD
Fig 4.1 General Views