BOC Edwards 18B4B, Инструкция по эксплуатации, Страница: 26 / 62

Issue A Feb 04
PAGE
20
18B4B Vapour Booster Pumps
IN
STALLATION
20
3.7 Connect the electrical supply
3.7.1 Electrical safety
You must use a suitable isolator with an over
current trip to connect the electrical supply to the
pump. Use a cable of suitable rating for the total
heater loading (see Section 2.6).
You must provide adequate strain relief and
protection for your cables. We recommend that
you use conduit to connect the electrical supply.
The terminal box incorporates a number of cable
entry leadthroughs (with ‘knock-out’ type blanking
plates), suitable for use with cable-glands or conduit
fittings. Use the most suitable leadthrough(s) for
your installation.
As described in Section 1.8, when the pump is
switched off, the heaters in the pump will absorb
moisture: this will cause a decrease in the insulation
resistance of the heaters.
WARNING
A competent electrician must carry
out the electrical installation of the
pump.
WARNING
Ensure that the electrical installation
of the pump conforms with your
local and national safety
requirements. The pump must be
connected to a suitably rated and
protected electrical supply and a
suitable earth (ground) point.
WARNING
Make the electrical connections as
described in this section and in
Section 3.7.2. If you do not, the
pump may not operate safely, and
will not comply with the
requirements of BS EN60204-1.
We recommend that you connect the electrical
supply to the pump through an RCCB (residual
current circuit breaker): the RCCB will operate to
disconnect the electrical supply if the insulation
resistance of the heaters is too small.
For additional electrical safety:
• Incorporate suitable fuses in your electrical
supply.
• If you do not use conduit for the electrical
installation, use cable which is heat resistant
(up to 200
o
C) in case of accidental contact
with the pump.
• Fit an emergency stop button, so that you can
easily shut down the pump in an emergency.
• Check the earth (ground) resistance of the
pump electrical supply before switch on.
Figure 10 shows the recommended control circuit.
3.7.2 Connect the supply to the pump
Connect a 3-phase electrical supply to the pump as
described below. Refer to Figure 4, which shows the
heater wiring connections. The terminal numbers in
Figure 4 are the same as those in Figure 5, which
shows the terminal block.
1. Check the type of connection (that is, Delta or
Star), then position the terminal block links and
connect the electrical supply:
• For 380-400 V, 415-440 V or 460-480 V Star
connection, position the terminal block links
as shown in Figure 6 and connect the
electrical supply to the heaters as shown in
Figure 7.
• For 200-210 V, 220-230 V or 240-250 V Delta
connection, position the terminal block links
as shown in Figure 8 and connect the
electrical supply to the heaters as shown in
Figure 9.
2. Refer to Figure 13. Connect the earth (ground)
wire to the main earth (ground) stud in the
electrical box (17).
3. Ensure that the earth (ground) wires on the terminal
block cover (4) and the electrical box cover (1) are
properly secured to the two earth (ground) points
on the bottom of the electrical box.