Boge RATIO, Руководство по эксплуатации

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RATIO.pm6.5 - USA
Page 1.7
RATIO
BOGE – RATIO compressor control for screw compressors
Operation
RATIO
Operation 1.4
Run-up phase
Load operation
Stand by
(Ready for operation)
The run-up phase – or star phase – is automatically
finished by switching the electropneumatical control
into load operation and the symbol
appears
in the display – probably first a change to delta
connection takes place 60 ms after the star phase.
Once the set maximum pressure is reached, the
idling symbol
appears. The system pressure
is reduced automatically.
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If required the pressure control starts the motor –
if the motor spinning time is finished, the system
pressure has decreased and no motor switching
limitation is necessary (otherwise the idling symbol
- blinks
→
the idling symbol appears during the
time-controlled run-up or star phase. For a star/
delta contactor combination the following applies:
the star contactor is switched on first followed by
the network contactor 20ms later. The idling symbol
signals the state of the electropneumatic control.
Thus it also appears after reaching the set maxi-
mum pressure – during the decrease phase of the
system pressure.
If the network pressure (in idling mode) drops below
the max. start-up back pressure and the automatic
operating cycles monitoring allows it, the control
unit switches the motor off and the Stand by symbol
is shown in the display. If the network pressure
drops to the set minimum pressure within the idling
phase, the compressor switches back to load opera-
tion and the respective symbol is displayed again.
If this happens shortly after having switched to
stand still, it has to be waited in case of contactor
connection – cf. also motor spinning time – until the
compressors is switched off for 20 s, to be sure that
the motor stands completely still, before you may
start it again. If the pressure is below the switch-on
pressure this is signalled by the blinking of the
Stand-by symbol until the compressor starts again.
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Operating/control element Function Operation/ Explanation