Initial Operation - Becker VARIAIR DIRECT SCREW 1500 Operating Manual

Other safeguards
• Motor PTC resistor: The driving motor is protected by an integrated PTC resistor. In case of overheating,
it will cause a malfunction in the frequency inverter, which, in its turn, will result in a shutdown of the unit.
The message "Motor Thermistor" will be displayed.
• Control transformer: The relevant protection is secured by an integrated motor contactor. The 230 V
voltage serves, among others, to supply all the coils of the unit, which means that a failure of this com-
ponent will bring all components driven by rotary current to a standstill. This will result in a shutdown
of the unit.
• Unit: The integrated switch disconnector activates the safety fuses in the event of malfunctioning or
excess current intake, thus shielding the unit from the external power network.

2.4 Initial operation

Settings of the motor protection switches
Before starting the unit up, check the settings of the integrated motor contactors and, if necessary, adjust
them. As a prerequisite for this procedure please check the input voltage of the unit.
consuming component
oil cooler fan
oil pump
cabinet ventilator 1
cabinet ventilator 2
control transformer
external motor fan
Checking the direction of rotation
Likewise, the direction of rotation of the following components must be checked before putting the entire unit
into operation and, if applicable, must be adjusted by exchanging two phases:
In each of these cases, the direction of rotation is marked by an arrow attached on the outside of the res-
pective.
consuming component
oil cooler fan
oil pump
cabinet ventilator 1
cabinet ventilator 2
External motor fan:
Since the runner of the external motor fan has straight blades, this component does not require checking of
the direction of rotation.
motor protection
switch
PKZ no.
F2
F3
F4.1
F4.2
F6
F5
protection
no.
K2
K3
K4.1
K4.2
Europe
400V / 50Hz
nominal current [A]
0,45
1,1
0,64
0,64
0,45
1,3
rotation direction
definition/check-up
When looking at the fan motor: left
Pressure build-up and lowering of the oil level have to
self-adjust.
When looking at the motor of the fan: right
see above
USA
480V / 60Hz
nominal current [A]
0,69
1,3
0,84
0,84
0,54
1,15
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