Initial Start-Up; Checking The Direction Of Rotation; Checking The Y/D Time Setting; Initial Start-Up With Pilot Signal Cable - Nederman VAC 20 Manual De Instrucciones

EN VAC 20
7.2

Initial start-up

7.2.1

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:
7.2.2

Checking the Y/D time setting

NOTE! The Y/D time setting is factory preset and does not normally need to 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.
7.2.3

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).
7.2.4

Adjusting Anti Surge Control by PLC

Follow the steps in the installation and service manual for the HV Control Panel Standard
chapter "ASC and LCC" to configure the ASC function.
Normally it is only the current Setpoint parameter that is set. Open the display (371-
SETTINGS ASC) to access parameters.
Testing the Anti Surge Control
Observe the damper rotation on the valve angle indicator on the front of damper motor.
Either view the motor current response when the airflow is restricted on the display (371-
SETTINGS ASC) parameter "Act.Motor 1 xx A", or use the trend diagram to view the motor
current response.
Stop the vacuum unit. Seal off the ducting completely on the inlet side or "suction side". Do
not do anything on the outlet. Start the unit.
24
1)
Stop the unit.
2)
Disconnect power.
3) Open the start and control unit
4) Switch two of the incoming phase conductors.
–
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).