Fujitsu Airstage J-II - Page 682

Selection of Electricity meter, CT, and VT
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Select the electricity meter, CT, and VT by considering the following items.
(1) Install electricity meters for each refrigerant system, if circumstances allow.
(2) Select VT/CT with a small VT/CT ratio.
(3) When using an electricity meter which is specied in pulse units (kWh/pulse), usually select
a meter with a 1kWh/pulse output.
Outdoor unit connection interface (CN135) to electricity meter
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Item Specications Remarks
Interface Dry contact “a” contacts “a” contacts: ON when shorted *1
Pulse Speci-
cations
Width: 50ms or more
Interval: 50ms or more
Units 1kWh/pulse (pulse units) recommended
Constant Considering the electricity meters available in some
countries, use of electricity meters with 3200 pulse/kWh
(pulse constant) or less pulses are possible.
Line length restriction 150m or less Between Electricity meter to
Outdoor unit
Wiring specications Control and instrumentation cable CVV-S (Control-use
Vinyl insulated Vinyl sheathed cable – Shielding) *2
2-conductor 1.25mm
2
*1: Pulse signal: normally OFF (open), ON (closed) when shorted
*2: When affected by interference by induction, select shielded CVV cable (CVV-S cable).
This is because copper shielding tape is wrapped around CVV cable and induction
interference from adjacent power cables is alleviated and normal communication is
maintained.
In addition, when the wiring is outdoors, select weather resistance cable.
Number of electricity meters installed and connection destination
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Item Specications Remarks
Number of electricity meters
installed
Max.200 Per System Controller
Max. 1 Number connectable to 1 outdoor unit (master or slave)
Electricity meter signal line
connection destination
Arbitrary
There are no restrictions on outdoor units which connect an
electricity meter.
An arbitrary electricity meter can be connected to an
arbitrary outdoor unit.
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FUNCTION SETTING FUNCTION SETTING