Product description 2.5 Safety and monitoring devices
Page 26 Operating instructions for S 40-3...S 150-3 series screw compressors
Safety valve
Fig. 2.4: Safety valve
Monitoring the drive
and fan motor
The drive motor is monitored by PTC resistors.
The fan motor is monitored by overcurrent/overload release units.
Rotational direction
monitoring (optional
accessory)
The pressure switch checks the rotational direction of the drive motor each
time the system starts up.
System pressure build-
up (optional accessory)
The system pressure build-up unit monitors the system pressure build-up
when the compressor starts up.
Safety valve (1) on the com-
pressed air/oil vessel pre-
vents the maximum admissi-
ble pressure being exceeded.
WARNING: Risk of injury!
When the maximum pressure is exceeded (e.g. incorrect setting of the oper-
ating pressure switch), the entire delivery volume of the compressor is
ejected!
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