Step 7: Selection Of Measuring Instruments - Mitsubishi Electric G-50A Technical Manual

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10. Step 7: Selection of Measuring Instruments

(1) Measuring instruments
Use measuring instruments with recommended pulse signals shown in the Table 10-1 below.
We also recommend using a watt-hour meter shown in the Table 10-2 below.
Model name
Output pulse type
Output pulse width
Pulse unit
Model name
Maker
Model name
Others
* (H) means it comes with a transformer (CT); (V) means it is semi-flush mounted with rear connection.
Other systems
PLC (with a pulse count software)
TG-2000A
CAUTION
Table 10-1 Recommended pulse specification
Semi-conductor relay type
100 ~ 300ms (100ms or above)
Select a measuring instrument which outputs
non-voltage a-contact pulse per pulse output unit.
Watt-hour meter : 0.1kWh/pulse, 1kWh/pulse is recommended.
3
Water meter
: m
/pulse
3
Gas meter
: m
/pulse
Calorimeter
: MJ/pulse
Table 10-2 Recommended watt-hour meter
Mitsubishi Electric
Single-phase 2 wire system
Single-phase 3 wire system, three-phase 3 wire system
Up to 32 units of Watt-hour meter can be used per 1 unit of PLC.
PLC DI board (QX40)
Figure 10-1 Measuring instrument wiring diagram
Make sure pulse unit is set in the measuring instruments. If not, consumption will
not be correctly measured, and charging functions and peak cut control will not
work correctly.
Power and gas consumption is counted by pulse. We will take no responsibility for
measurement results since they depend on performance and accuracy of
measuring instruments.
Description
ON
* Except for the watt-hour meter, select the measuring
instrument type with the appropriate pulse unit.
Description
Three-phase
Watt-hour meter
with a pulse
oscillator
Single-phase
Water meter with a pulse oscillator
Gas meter with a pulse oscillator
100ms ~ 300ms
Outdoor unit power supply
Indoor unit power supply
71

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