Design Technical Manual

(2) When electricity meter used is specied by pulse constant
The connection conguration is shown below.
Touch panel
controller
measurement
line
measurement
line
Pulse constant
reference point
Pulse constant
reference point
pulse
transmission
line
pulse transmission line
CT
VT
(PT)
3ø
1ø
VT
(PT)
System Controller
Transmission line (VRF Network)
Outdoor unit
Indoor unit
RB unit
Power cable
Electricity meter
Electricity meter
to CN135
to CN135
For the electricity meter specied by pulse constant, the Input Power indicated by output pulse
must be corrected by VT/CT ratio. In this case, the settings are as follows:
Set point Set item Set value Description Remarks
Electricity
meter
Set in
accordance
with the product
manual.
- When there is a product unique setting,
setting is performed in accordance with
the product manual. (Pulse constant
value, output coe󰀩cient, etc.)
Outdoor unit Meter No.
setting
Arbitrary Set an unique electricity meter No. for
electricity meter identication.
The information
will become
necessary when
setting System
Controller or
ECA Tool later.
Refer also to
2-1.OUTDOOR
UNIT
Electricity meter
pulse setting
The pulse constant
value / (VT ratio x
CT ratio). However,
truncated after the
decimal point
Set the approximate number of power
meter pulses that are equivalent to
1kWh.
When set number of pulses come
from the electricity meter, the outdoor
unit communicates “1” to the System
Controller or ECA Tool.
System
Controller or
ECA Tool
Electricity meter
system setting
Unit to be measured by
electricity meter
Sets the outdoor unit and indoor unit,
measured by the electricity meter of
the meter No. set at the outdoor unit.
The value set
by each outdoor
unit is used.
Pulse setting (Electricity meter pulse
setting value) x (VT
ratio x CT ratio)/pulse
constant
Values after the
decimal point must be
also input. *1
Set the standard number of kWh for the
value communicated from the outdoor
unit.
Set the number of kWh that
corresponds to the “1” communicated
from the outdoor unit.
Refer to the
value set by
each outdoor
unit.
*1: Input up to 6 decimal digits
[Setting example]
Equipment conditions: VT ratio=1 (not used), CT ratio=500(2500/5A), electricity meter=3200 pulse/kWh
Set value: Electricity meter pulse setting=6 (3200/ (1x500)),
Pulse setting=0.9375 (6x (1x500)/3200) ---Refer to the calculating formula of the table above.
NOTE:
Be sure to select an electricity meter that sends more pulses per 1kWh than VT ratio x CT ratio. Other-
wise, the measurement error of the power will be larger than 1kWh, thus a󰀨ecting the accuracy of ECA.
- (07 - 180) -
FUNCTION SETTING FUNCTION SETTING