Connections - Nederma RBU Serie Manual De Instrucciones

EN RBU
5. Motor.
6. Transmission.
7. Belt guard.
8. Discharge silencer.
9. Base.
10. Thermal fuse.
11. 3-lobe roots-pump.
12. Inlet silencer with safety grating.
13. Universal valve. This is a combined vacuum limiting valve, back flush valve, and
overpressure valve.
14. Vacuum limiting valve disc.
15. Maximum work vacuum regulator.
16. Safety vacuum regulator. The regulator must not be adjusted.
17. Inlet safety grating.
18. Overpressure valve.
5.1

Connections

The motor is connected electrically with the enclosure roof removed. See the start and control
unit's manual for electrical connections. Connections may vary depending on the options.
Connecting material such as cables are not included with the unit. Different dust collectors are
available; see the manual of the dust collector for details.
Start and control units from Nederman have terminals for easy connection of all control cables.
If other equipment is used, this equipment must be similarly equipped and connected for the
guarantee of the RBU unit to be valid. Most failures are result from faults in the electrical
equipment or connections. The motor overload relay must be of the 'heavy start type' as some
units are heavy to start. Otherwise the motor overload may trip because of the high current and
the long time spent in the Y-mode.
Figure 3 contains a schematic diagram of the normal connections. These are as follows:
1. Exhaust duct in steel spiro for indoor installation.
2. Optional: 'Jet cap' for outdoor installation.
3. Vacuum pipe in non-spiro steel from dust collector.
4. 3-phase supply.
5. Start and control unit. Normally with a frequency converter or Y/D-starting. Direct starting
is also possible.
6. Optional: Pilot signal cable for installations with automatic start/stop.
7. 6 mm (1/4") tube air line to the universal valve. The tube is supplied with the unit.
8. T-joint for air line to dust collector. See the dust collector manual for more information.
9. Dirt and water separator for compressed air. The separator is supplied with the unit.
10. Dust collector for 1–2 units. The dust collector is ordered separately.
11. Cable to filter cleaning unit. See the dust collector manual for more information.
12. Two lead cable to thermal fuse, see also Figure 5. The cable can be combined with the cable
to solenoid V1, item 13, into a single four lead cable.
14
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