Rotar Plus 20-25 Easytronic - Cod.197AA2702 - Edition 00 01/2004
GB
8
CONTROL FUNCTIONS
1) Check direction of rotation
Alarm trips in the event of incorrect phase sequence being detected. The compressor locks
up; to restore operation, the correct phase sequence must first be re-established.
NOTE: To reset the alarm, the equipment must be
isolated from the a.c. power supply
.
2) Check temperature sensor
Alarm trips in the event of temperature sensor fault (sensor open or short circuiting). The
compressor locks up; to restore operation, check the connection and/or replace the sensor,
then press
.
3) Maximum oil temperature
Alarm trips when the maximum oil temperature is sensed. The compressor locks up; to
restore operation, wait for the temperature to fall below the programmed value, then press
.
4) Minimum oil temperature
Alarm trips when the minimum oil temperature is sensed. The compressor locks up; to restore
operation, wait for the temperature to rise above the programmed value, then press
.
5) Oil temperature pre-alarm
Trips when the pre-alarm oil temperature is sensed. The compressor does not lock up. To
override the pre-alarm, press
.
6) Motor thermal overload
Operates when the thermal overload relay is tripped. The compressor locks up. To silence
the alarm, first verify the cause, then press
.
7) Emergency
A circuit activates to lock up the compressor when the red emergency button is depressed.
To silence the alarm, first reset the emergency button, then press
.
8) Machine maintenance pre-alarm
Trips to warn the user than that machine is due for routine maintenance (oil change, service
filters, etc.). The alarm must be silenced by the service technician, who when carrying out
maintenance operations will select the item Pre-alarm hours from the menu and reset the
value as described under the heading Modifiable parameters - point (1).
9) Separator pressure switch
Alarm trips in the event of the separator pressure switch contact opening. The compressor
locks up. To silence the alarm, first reset the separator pressure switch, then press
.
10) 4-20 mA fault (pressure sensor)
Alarm trips when the pressure sensor connected to the 4-20mA input does not operate
correctly. The compressor locks up. To silence the alarm, first restore the pressure switch to
normal status, then press
.
11) Maximum pressure
Alarm trips when the maximum pressure setting is exceeded. The compressor locks up. To
silence the alarm, first restore the correct pressure, then press
.
ALARM MESSAGES
In the event of a fault occurring or of set safety limits being exceeded, the red alarm light will appear and the current alarm
condition is displayed.
Display status
30°C h00110 m05
Wrong rotation
30°C h00110 m05
Temp sensor faulty
110°C h00110 m05
Max oil temp
-10°C h00110 m05
Min oil temp
105°C h00110 m05
Oil temp pre-alarm
74°C h00110 m05
Motor thermal relay
74°C h00110 m05
Emergency button
74°C h00110 m05
Routine maintenance
74°C h00110 m05
4-20mA fault
75°C h00110 m05
Separator p/switch
74°C h00110 m05
Max pressure
SAFETY DEVICES (FIG. 5)
1)
Electronic transducer: controls both STOP and START
pressure.
2)
Pressure switch for oil separator filter clogging:
indicates efficiency limit of oil separator filter.
3)
Minimum pressure switch:
4)
Pressure switch for air filter clogging: indicates air filter
efficiency limit
5)
Safety valve: opens the air bleeding unit when the
safety value is reached.
6)
Max. temperature sensor: stops motor over +110°C.
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