Service And Maintenance Of Atex Equipment; Ground Check Measurement - Nederman FlexPAK DX 800 Bedienungsanleitung

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NOTE!
Always disconnect the supply voltage with the maintenance switch before any service,
whether mechanical or electrical. Always lock the maintenance switch in the off position and, if
possible, secure with a padlock.
NOTE!
Always disconnect the compressed air supply before any service, whether mechanical or
electrical.
NOTE!
Contact Nederman if the frequency converter needs service.
NOTE!
The unit is CE-marked. Connections to the unit, initial start-up and maintenance are to be
carried out according with this manual.
9.1

Service and maintenance of ATEX equipment

To ensure the required level of protection, ensure that the following is performed:
•
FlexPAK 800/1000 DX is regularly inspected for damage or malfunction. If
FlexPAK 800/1000 DX is damaged, it is to be shut down and any explosive atmosphere
removed.
•
There is to be no explosive atmosphere when servicing or inspecting FlexPAK 800/1000 DX.
•
Only Nederman original spare parts are to be used.
•
FlexPAK 800/1000 DX is not be covered with thick dust layers (>5 mm). This is prevented
by setting up routines for regular cleaning and including these in the explosion protection
document.
9.2

Ground check measurement

Check that the unit is properly grounded after both the main installation and regular maintenance
work. If a component is removed and refitted, ground connection is to be verified.
NOTE!
All metal parts of the unit are to be grounded. The system is to have two independent
ground connections; one on the FlexPAK 800/1000 DX (GND1) and the other one on the duct
system. Follow the procedure in "To measure ground connection: below to ensure this.
Ground connection is measured between GND1, see figure 19, terminal PE, and the following
components on the unit:
1.
Filter bags, see figure 4A, item 3.
2.
Explosion suppression device, see figures 7 and 2A, 2B and 2C:
1)
A screw on the explosion venting panel (7A).
2)
The pipe of the explosion suppression device (7B).
3)
A screw on the quenching device.
3.
Inlet, see figure 4C, item 21.
4.
Collector bin, see figure 4A, item 1.
5.
Fan, see figures 4A and 4B, item 13.
To measure ground connection:
NOTE!
The duct system (inlet and outlet) is NOT to be connected during measuring.
1.
Disconnect mains ground from GND1.
2.
Measure between all components according to the list above and GND1. The value is to be
≤100 ohm.
3.
Measure and check whether there is contact between the incoming duct system and the
disconnected incoming mains ground. The value is to be ≤105 ohm.
4.
Connect the incoming duct system. Ensure that there is a second ground connection between
the duct system and the unit and that it is properly grounded to the unit.
1)
Measure and check whether there is contact between GND1 and the external mains
ground (≤105 ohm).
5.
Reconnect mains ground to GND1.
FlexPAK 800/1000 DX EN
49