Initial Start-Up; Checking The Direction Of Rotation; Checking The Y/D Time Setting; Checking The Start-Up And Vacuum Limiting Valve - Nederma RBU Serie Manual De Instrucciones

EN RBU
• Nederman start and control units have the terminals connected, and in some cases jumped
connections. Verify the connections using the connecting diagrams.
• The pilot signal cable from all valves is linked to the start and control unit on units with
automatic start/stop.
• All valves at work sites are closed.
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!
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

Checking the start-up and vacuum limiting valve

Perform the following start-up and vacuum limiting valve at initial start-up to check that the
valve works correctly:
1. Start the unit.
2. Place your hand on the motor cooling air outlet, Figure 3 item 16.
3. The valve works correctly when:
–
–
8.2.4

Checking the vacuum level

At initial start-up ensure the vacuum level is at correct level by doing the following:
• Check that the vacuum level on the vacuum meter, Figure 3 item 15, corresponds the
specified levels in 'Table 4-1: Technical data'. See Section '9.11 Vacuum level' for more
information about checking the vacuum level.
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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 be adjusted.
Air is sucked into the outlet silencer during Y mode.
Hot air is blown out from the outlet silencer during D mode.