7
Electrical Connections
Important E.M.C. Considerations
Use a dedicated, earthed metal conduit for both the
control signal cable and the security circuit cables
along their entire length - they may share the same
conduit where practicable. The earth must be made
by "metal-to-metal" contact and should be a good
RF (Radio Frequency) earth.
The control and security circuit connections should
be run in screened cable with the screen grounded
at the Microvap end (onto the electrical section back
panel). The screen should be maintained as close
as possible to the cable ends and any tail between
the screen and the earth point must be kept short
(50 mm maximum).
Control Cable / Security Circuit
Conduit Entry Arrangement
Control Cable / Security Circuit
Screening Arrangement
Tail to be kept short
(less than 50mm)
Cables to control terminals
Screen left intact
Outer insulation
Earthed back panel
Important Power Connection Information
Vapac 24V secondary Transformer Primary supply connections:
Vapac units are wired to allow connection to alternative site Voltages.
Make the following simple checks before connecting the power supply:-
Move the RED connection on the Microvap transformer primary winding
circuit to the position marked with the supply Voltage that is to be connected
between Microvap power terminals A1 and A2.
The transformer primary circuit terminal positions are clearly marked:- 200V,
230V, 380, 415 & 440V. For sites where the actual (measured) voltage is
400V the preferred transformer tapping is 380V.
Note:
24 V a.c. Control circuit
-
Transformer Primary Circuit -
And RDU.
230V ac Pump Supply.
-
3.15 A 20 mm (F - Quick blow) fuse (Pt.No. 1080096) mounted on Terminal
rail F3 for master control and F4 for slave unit control.
Two fuses protect the control circuit on Single cylinder units F1 2.0A (slow
blow) (Pt. No. 1080095) mounted in fuse-terminal holder protects Primary
transformer and RDU unit if fitted. F2 500 mA 20 mm (F - Quick blow) fuse (Pt
No. 1080054) mounted in fuse-terminal holder protects Transformer Primary
and Pump or both pumps if two pumps are fitted. Twin cylinder units F5 2.0A
(slow blow) (Pt. No. 1080095) mounted in fuse-terminal holder protects second
RDU unit if fitted.
The pump or pumps on twin cylinder units are feed from the main transformer
via a 230 volt auto winding. The pumps are protected by fuse F1 and F2 above
feeding the transformer primary.
All metal surfaces which come
into contact with each other,
must be free of paint, grease,
dirt, etc., thereby ensuring a
good low impedance R.F.
(Radio Frequency) path to
ground.
Electrical section metalwork
Metal conduit
Summary of Contents for MICROVAP V15
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