Blitz VARIS - Trouble Shooting; Compressor Fails to Start; Protective Motor Switch Issues

Operating instructions
Trouble shooting
10
102620 • 05/2019
7 Trouble shooting
Danger
Trouble shooting may be carried out only by trained experts or by staff members of
BLITZ Company. In all actions, please observe the fundamental safety instructions (cf.
chapter 1), the safety instructions for operation (cf. chapter 4), and the safety instruc-
tions for maintenance (cf. chapter 5).
The compressor does not start up.
The protective motor switch has been triggered.
Potential reasons
Actions
No connection to network.
 Check the connection to the mains.
Fuse has blown.
 Check the electric cable, switching units
and the motor.
 Use time-lag fuses only.
 Replace the fuse.
Network pressure is over cut-in pressure.
 Reduce the pressure in the network.
The pressure switch is defective.
 Replace the pressure switch.
The motor has broken down.
 Check the electric system and the cables.
 Replace the motor.
The protective motor switch has been trig-
gered.
 See Table “The protective motor switch
has been triggered”.
Potential reasons
Actions
Wrong setting of the protective motor switch.
 Check the setting of the protective motor
switch.
Fault at the electric connection.
 Check the electric connection for un-
dervoltage and phase failure.
 Check the conductor cross section.
Ambient temperature is too high.
 Improve the room ventilation.
 Select a cooler location.
Damage on the compressor
 Check valves, crank mechanism and fan
for potential damage.
The compressor is not relieved.
 Check the relief mechanism.
 Check the check valve, and replace, if and
when necessary.
Motor gets too hot due to high switching
frequency.
 Check the pressure switching points.
The pressure switch has been set wrongly.
 Check the pressure switching points.
The clamping connections have come lose.
 Retighten the clamping connections.