Fig. 16 Option C5: Oil level monitoring
1
Compressor block
2
Oil level monitoring
The contact in the oil level monitor is wired at the factory as a normally open contact.
Oil level
Electrical contact
rises
closes
falls
opens
Tab. 30 Option C5: Oil level monitoring factory setting
➤ Connect oil level monitoring as follows.
6.9.1.1 Connecting the oil level monitor
Connecting oil level monitoring for direct online starting
Machines with direct online starting and an undervoltage trip in the pressure switch require addi‐
tional control and connection components.
If the machine is shut down by the undervoltage trip, the machine does not restart automatically
when power is restored after a power cut.
1. Electrical connections to be made by the user.
2. Switch on and off the compressor at the pressure switch.
Connecting oil level monitoring for star-delta starting
Machines with star-delta starting require additional control and connection parts and an external
control unit. The oil level monitor must be linked with the external controller so that the machine is
shut down if oil falls below the set minimum level.
If the machine is shut down, the machine restarts automatically when power is restored after a
power cut.
1. The user is to make the connection to the power supply or the connection to an external con‐
trol unit.
2. The machine is switched off by the external controller.
6.9.1.2 Float switch
The float switch has been set at the factory as follows:
■ The machine shuts down when the oil falls to its minimum permissible level.
■ The tip of the red arrow is visible for 2 mm.
➤ Check the setting and adjust, if required.
6
Installation
6.9
Options
42
Assembly and operating manual 2-stage piston compressor
EPC-2-G
No.: 9_5753 24 E
