Nederman VAC 12/20 Manual De Instrucciones página 26

EN VAC 12/20
• All electrical connections have been correctly made as in Figures 6-9.
• Nederman start and control units have the terminals connected, and in
some cases jumped connections. Verify against the connecting diagrams.
• The pilot signal cable from all valves is linked to the start and control unit
on units with automatic start/stop.
• Anti surge control: The current transformer is connected to the relay box.
8.2 Initial start-up
8.2.1 Checking the direction of rotation
At initial start-up, check the direction of rotation by doing the following:
1. Start the unit.
2. Compare the direction of the motor rotation with the arrow on the motor.
• If the direction of the motor and the arrow are the same, allow the starting
procedure to continue.
• If the direction of the motor is different from the direction of the arrow,
change the direction of the motor by doing the following:
1)
2)
3)
4)
8.2.2 Checking the Y/D time setting
NOTE!
be adjusted.
Switching to D mode before the motor has reached full speed can damage the
start and control unit. This is particularly important when automatic start and
stop is installed. Too long in Y mode results in an unnecessary delay before the
unit delivers full vacuum.
At initial start-up check the Y/D time setting by doing the following:
• Make sure the motor sound is constant and high pitched, indicating full
motor effect, before the motor switches to D mode.
8.2.3 Initial start-up with pilot signal cable
For units with pilot signal cable also ensure the following at initial start-up:
• The unit only starts directly when one of the following occurs:
–
–
• The unit shuts down when the time set on the timer relay has elapsed after
the valve is closed (up to 30 minutes).
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Stop the unit.
Disconnect power.
Open the start and control unit
Switch two of the incoming phase conductors.
The Y/D time setting is factory preset and does not normally need to
A valve is opened at a work site, causing the micro switch to close.
The test start button is pressed on the start and control unit (if
available).