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POWER CONNECTION
The indoor unit PS-A4 card -48V connector should be connected to a 10A fuse or automatic circuit breaker.
This is sufficient when using a 2 x 1.5mm2 power cable and takes into account the fact that the current will
increase when the battery voltage drops. Smaller fuses (6A) might blow when the IDU is fully equipped and
the battery drains during a power failure in the site.
Figure 13. Power supply connector
Pins number 1 and 2 are internally connected on the equipment side (-48V) and so are pins 2 and 3 (0 V). It
is not necessary to connect all four pins when using 2 x 1.5mm cables. Connect e.g. pin 1 and 4 only.
The connector housing is Tyco Electronics 1-178288-4 which will accept four pieces of connector pins, type
number 1-175218-2 (Figure 14). These connector pins (female) are for 0.5 to 1.3mm
2
wires. The connector
kit is included in the standard delivery. It is in practise suitable up to 1.5 mm2 fine stranded wires as well.
ASSEMBLING THE POWER CABLE
Normally a ready-made DC cable should be used. Field installation of the connector should be done only
exceptionally.
It is recommended to use the appropriate tool Tyco Electronics TE 91558-1. Please note that the insulation
is attached separately from the wire (remove the insulation for 3 to 3.5mm only). It may be necessary to
flatten the insulation with pliers or similar in order to push the connector pin inside the connector housing.
Do not bend the guide blades. Each pin has to be pushed in until it locks audibly. Test each pin by pulling
back; the connector must not move back from the housing.
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