12
1.4.3
Electrical Connections
The wiring to the Vapac should be done by a qualified
electrician. The external overcurrent protection and wiring
should comply with the appropriate Regulations and Codes
of Practice
.
Important:
Make sure the connection to the primary
Voltage winding of the Vapac transformer matches the
supply Voltage which is to be connected between Vapac
terminals A1 & A2.If the actual (measured) site voltage is
400v the preferred tapping is 380V
.
A fused disconnect/isolator or MCB should be used to
disconnect the supply from all electrodes simultaneously.
This must be sized to suit the total maximum phase/line
current of the unit and should be located adjacent to the
Vapac cabinet or within easy reach and readily accessible.
In Vapac VAPANET units terminals A1, A2 and A3 are for
the power supply connections as indicated in the diagrams
below (twin cylinder units have two supplies A1,A2,A3 &
B1,B2,B3).
Twin cylinder units’ have terminals for the connection of
two power supply input circuits. On twin cylinder units’ this
allows individual external protection of each steam cylinder.
Fused disconnect/isolator or MCB provision must be linked
to ensure both 3 phase supply inputs are disconnected
simultaneously.
1.4.4
Cable Entry Provision
Cable glands must be used to ensure cables are held
securely at the entry position. All Vapac cabinets are
equipped with a removable gland-plate. The installing
electrician should remove this and take it to a work-
bench to drill for the required cable gland size.
1.4.5
Vapac Control Circuit Transformer
The internal control circuit of the Vapac unit operates at
24Vac - the transformer secondary is set at 24V.
As standard the Vapac VAPANET includes a
transformer with alternative primary winding options
200V, 230, 380, 415, and 440V and requires on site
adjustment to match it to the Voltage connected to
Vapac terminals A1 and A2.
The transformer also has a 9V secondary tapping which
provides power to the VAPANET 1150630 PCB.
Important:
The Vapac transformer must
NOT
be used
to power other equipment or the warranty will be
invalidated.
1.4.6
RDU Connection
Vapac terminals 25 & 26 are included to provide a
230Vac electrical supply for the fan motor in the RDU
(Room Distribution Unit) .
Note: The 230Vac at terminals is derived from the
incoming electrical supply to the Vapac. If the local
supply cannot provide 230Vac (example 400V No
Neutral supply) it will be necessary for a transformer to
be fitted in the RDU as indicated below.
Notes:-
1. All units must have a PE earth connection connected to the units terminal.
2.
Unit with N.A. in the following tables means NOT AVAILABLE there is not a unit available to run at the voltage
and phases shown. Please check that the correct model reference is ordered and installed, for the low or high
voltage required, and at the desired steam output.
3.
Standard design is for 50 Hz. Supplies. Design for 60 Hz. Also available - 60 Hz. Supply must be specified with
order as the standard pump is only 50Hz.
FOR FULL ELECTRO-MAGNETIC COMPATIBILITY A NEUTRAL CONNECTION IS REQUIRED FOR ALL PROPORTIONAL
UNITS AS INDICATED IN THE CONNECTION DIAGRAMS ON THE FOLLOWING PAGES.
RDU Connection
The three type’s of RDU are for various voltages and phase without neutrals connections that can be made to the Vapanet unit. Please refer to
the Microvap connection diagram on the following three pages as to which type of unit is required. On twin cylinder units two fan circuits as
shown below one for each cylinder will be in the RDU unit.
RDU electrical loads
Model
RDU05LE
RDU09LE
RDU18LE
RDU30L
RDU45LE
Number of fans
2
3
3
5
7
Fan voltage
230 v
230 v
230 v
230v
230v
Each fan current 50Hz
(60 Hz)
115 mA
(105 mA)
115 mA
(105 mA)
115 mA
(105 mA)
115mA
(105mA)
115 mA
(105 mA)
RDU total load current 50Hz
(60 Hz)
225 mA
(210 mA)
345 mA
(315 mA)
345 mA
(315 mA)
575mA
(525mA)
805 mA
(735 mA)
