Marine Galvanic Isolator GI70SM
Installation:
1.
Remove the external AC power cord from the shore power AC inlet socket.
2. Locate the green (or sometimes yellow&green) earth wire immediately behind the AC
inlet socket (this is the wire leading from the large pin) and cut the wire at a convenient
point. It may be necessary to remove the outer sheathing of the 3 core cable to find the
green wire.
Please ensure the other two cables are not damaged in any way when
you remove the sleeving.
3. Connect one end of the green cable to the screw terminal of the isolator and the other
green wire to the other terminal (either way round: the isolator works in both directions).
4. Mount the isolator in a well ventilated position (minimum 4” airspace around the unit)
away from inflammable materials and preferably on solid wood or metal battens (not
directly on g.r.p.)
:
In
extreme fault conditions
the unit
may
become hot for a short
period before the trips operate (milliseconds!) so a little extra care in mounting is
essential. Regular inspection is recommended so mount in an easily accessible
position for testing.
It may be necessary to mount the isolator away from the AC inlet socket: Simply remove
the green earth wire from the rear of the socket & fit a new piece of earth cable(green
min 4mm) & connect this cable to one terminal of the isolator. Continue from the other
terminal with green cable to the brass earth strip on the mains distribution outlet.
GALVANIC ISOLATOR
GREEN
MAINS DISTRIBU-
TION INSIDE BOAT
(Earth Terminal)
GREEN
SHORE POWER
INLET SOCKET
Bulkhead Mount
Red or
Brown
Blue
The function of this isolator in the ground circuit can be critical to safety. If you are
not confident in your ability to install this unit please seek professional help.
pg_0002
Testing installation
Specification
Supplied by I.E.S. Leeds UK.
Tel: 0113 2 774747 / 711858
Fax: 0113 2 774797
E-mail: here@instantelectronics.freeserve.co.uk
Email helpline: galvanic.isolators@virgin.net
This unit is a solid state device constructed with high grade components and requires no servicing.
Testing can be carried out with a simple multimeter as follows:
Remove the mains input cable to disconnect the AC Supply Connection
to the vessel.
With a digital multimeter set to the OHMS position connect the probes to either terminal of the
isolator and note the reading. Now reverse the probes: The meter should show a similar reading
within 12% in both directions. If your meter has diode check facilities performing the same
operation will result in a reading of approx 1.65 volt in both directions. Any
significant
difference
between the two readings indicates component failure.
An ohms reading of “infinity”or “zero” would indicate failure of the isolator: Refer to manufacturer.
Should the isolator become warm after initial connection, this indicates conduction of the internal
diodes resulting from defective mains shore power or internal wiring fault. Under these
circumstances please remove the mains shore power lead and consult a qualified electrician.
To ensure continued protection we recommend performing this quick test on a regular monthly
basis together with checks on the shore power / vessel rccd test facility.
Models GI70 & GI70SM
Solid State Construction. Isolated Heatsink. Epoxy sealed.
Suitable for use with rccb protected shore power outlets of 30 & 50 amps.
Operating Range 0.9 -250 volts AC/DC. 70 Amps. Peak 400 Amps.
No user replaceable components. Conforms to EC/73/23/EEC & 89/336/EEC
12 months warranty subject to correct installation and operating conditions.
Liability limited to replacement of operating unit only. The manufacturers do not accept
responsibility for injury or loss sustained through incorrect installation or operation of this
unit, defective shore power or faulty A.C. mains / D.C. installations on board the vessel.
STATUS MONITOR FOR USE WITH MODEL GI70SM
Carry out installation as for model GI70 & test as above. Mount the status monitor in a convenient
position & feed the attached test cable through any bulkheads & clip securely.
Cut the cable provided to a suitable length & feed to isolator position. Fit the 2 gold connectors
(provided) to the cable ends & at this point test the operation of the l.e.d,s by
briefly
applying the
voltage from a 9 volt pp3 battery to the two gold plugs:
One led will light at full intensity.
Reverse the applied voltage & the other led will light
at full intensity.
Connect the gold plugs into the terminal posts of the isolator (either way round) & repeat the test
with the 9 volt battery. This will simulate a fault condition & cause the isolator to conduct.
The leds will again light but now at
reduced intensity
indicating correct operation of the isolator.
Testing is now complete.
Fault Indication: 1 led lit : dc current leakage
2 leds lit : ac current leakage