Maintenance; General Inspection - Nederman VAC 20 Manual De Instrucciones

EN VAC 20
Example for 460 V, 40 hp:
•
I
Then set I
repeated opening and closing of the valve, increase the dead band by setting I
higher.
Testing the Anti surge control settings
Slowly increase the flow through the fan by opening a valve (or sliding aside the board
blocking the collector inlet). The yellow MIN LED should go out (if it has been lit) and the
MAX LED should light up if the flow is further increased. As the flow is gradually increased,
the valve closes more and more until it is fully closed and I
For an installation in full use this is a normal situation.
Block the flow rapidly and check that the valve finds a balancing point within a few seconds
without self-oscillating. This terminates the test.
8

Maintenance

Read Chapter '2 Safety' before carrying out maintenance.
It is recommended to install an hour service meter in the start and control unit.
NOTE! The intervals in this chapter are based on the unit being professionally
maintained.
WARNING!
Work with electric equipment must be carried out by a qualified electrician.
WARNING!
Use proper protective equipment when risking exposure to the dust.
WARNING!
Always disconnect the supply voltage before any servicing, whether mechanical or
electrical. Always lock any maintenance switch in the off position.
WARNING!
Ensure that no vacuum is present in the system during service.
WARNING!
Make sure the unit is cool before undertaking an inspection to avoid burn. The unit and
its parts can get very hot.
8.1

General inspection

Perform the following general inspection every 500 hours of operation:
•
Inspect the incoming connections. Ensure all cables and hoses are tightly fitted.
•
Check for signs of corrosion or other damage.
•
Check that the ventilation inlet and outlet of the unit are clear.
•
Check that the ventilation to the room is clear (if placed indoors).
•
Check for dust or collected material inside the unit. Dust or collected material may
indicate a filter malfunction.
26
=400/460x32≈28 A.
e min
to a value about 5 units higher than I
e max
Risk of electric shock.
Risk of personal injuries.
Risk of electric shock.
Risk of personal injury.
Risk of burn injury.
. If self-oscillating occurs, resulting in
e min
lights up yellow continuously.
e max
slightly
e max