Electrical Wiring - Fujitsu AIRSTAGE UTY-ALGX Instruction Manual

37.

Electrical Wiring

● Electricity meter connection composition
In order to control the peak cut of energy saving, In principle, It is necessary that a electricity meter with
pulse sending function to monitor all electricity consumed by air conditioner. The number of electricity
meter should be less than predefined number, but if cover all observed subject, it can be multiple in-
stalled. The installation construction of general electricity meter is shown as follows.
Electricity meter
Pulse fixed number
setting point
VT
(PT)
3ø
1ø
Pulse unit set-
VT
ting point
(PT)
Pulse fixed number
setting point
Electricity meter
Item
Electricity meter Service line for measurement use measure the voltage and current of connect-
ed power cables to obtain consumed electricity or output a measured value
related pulse from pulse transmission line.
VT(PT) Voltage Transformer (Power Transformer)
Make the voltage of power cables lower to be a voltage that the electricity
meter can measured. It will shows with VT(PT) ratio that how the voltage was
lowered.
Usually, it has no necessary that a voltage level used on outdoor units, indoor
units.
CT Current Transformer
Shunt the current value of power cables to be current that the electricity meter
can measured. It will shows with CT(PT) ratio that how the shunt it.
It have 2 type of " insert into power cable type" and " through into power cable
type".
Pulse unit Pulse unit shows the relation of electricity meter's output pulse and measured
electricity. The numerical value specified in pulse unit shows the value of kWh
that are equivalent to a pulse in consumed electricity of power cables.
Unit is [kWh/pulse]
The numerical value specified in pulse unit has consider to the used VT or CT
ratio, it corresponding to the value of actual consumed electricity.
Pulse unit setting point It shows the measurement point of consumed electricity specified in pulse unit.
A fixed number of pulses Pulse fixed number shows the relation of measured electricity of electricity
meter and output pulse. The numerical value specified in pulse fixed number
shows the number of pulses that are equivalent to 1kWh consumed electricity
that input electricity meter.
Unit is [pulse/kWh]
It is need to multiply VT, CT ratio by the value of pulse fixed number respec-
tively when you calculate the actual electricity consumed on power cables,
because of the numerical value specified in pulse unit has not taken the used
VT or CT ratio into consideration.
Pulse fixed number set- It shows the measurement point of consumed electricity specified in pulse
ting point fixed number.
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Pulse transmission line
to CN135
Service line for
measurement
use
Outdoor unit
CT
Power cable
Indoor unit
Service line for
measurement
use
Transmission line (VRF Network)
Pulse transmission line
Explanation
302
System Controller Lite
Internet
to CN135
Field supplied parts
• Electricity meter
• CT
• VT (PT)
System Controller
Lite (Remote site)
Remarks