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9.2 Setting of ratings
For setting, it is necessary to use the optional small display unit (EMU2-D65) or logging display unit (EMU2-D65-M). Order one of these
units when purchasing this unit.
In case of EMU2-RD3-F/C, EMU2-RD5-F/C, EMU2-RD7-F/C
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Phase and wiring [Default: 3-phase 3-wire]
One of the following systems can be set for each circuit.
Single-phase 2-wire, single-phase 3-wire and 3-phase 3-wire
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Primary voltage [Default: 220 V]
The primary voltage values applicable to each unit type are shown below. The primary voltage can be selected from the following values for each
circuit.
Settings
110 V, 220 V, 440 V, 690 V, 1100 V, 2200 V, 3300 V, 6600 V, 11000 V, 13200 V, 13800 V
15000 V, 16500 V, 22000 V, 24000 V, 33000 V, 66000 V, 77000 V, 110000 V
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
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On a single-phase 3-wire circuit, use the unit at the primary voltage setting of 110 V.
•
The unit can be connected directly to a 110 V or 220 V circuit. To connect it to a circuit of 440 V or more, a potential transformer must
be connected externally.
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Sensor type and primary current [Default: Direct sensor/100 A]
The primary current must be set according to the sensor type as shown below. One of the following settings can be selected for each circuit.
Sensor type
Primary current setting
EMU-CT50 50A
EMU-CT100 100A
EMU-CT250 250A
EMU-CT400 400A
Direct sensor
EMU-CT600 600A
5A
sensor
EMU2-CT5
5A, 6A, 7.5A, 8A, 10A, 12A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 75A, 80A, 100A, 120A, 150A, 200A, 250A, 300A, 400A,
500A, 600A, 750A, 800A, 1000A, 1200A, 1500A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 6000A, 7500A, 8000A,
10000A, 12000A, 20000A, 25000A, 30000A
Caution
EMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400 and EMU-CT600 are designed for low-voltage circuits (maximum voltage of 460
V). These models are not applicable to high-voltage circuits. When using EMU2-CT5, pass the secondary side (5A) of the current
transformer through the sensor. The model can be connected directly to circuits of up to 200 V (maximum voltage of 260 V).
Connecting it to a high-voltage circuit by mistake may cause burnout of the unit or a fire, resulting in a hazardous situation.
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
z
When EMU2-CT5 is used, set the ratings of the primary CT.
z
Ensure that the product of primary voltage setting and primary current setting does not exceed 88665 kW (the setting range is limited
by the full-load power). For example, if the primary current is set to 30000 A when the primary voltage setting is 110000 V, the primary
voltage setting is automatically initialized to 220 V. If the primary voltage is set to 110000 V when the primary current setting is 30000 A,
the primary current setting is automatically initialized to 100 A.
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Demand time limit [Default: 2 min]
The current demand time limit and the power demand time limit can be set separately. One of the following settings of each item can be selected for
each circuit.
Item Settings
Current demand time limit
0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min
Power demand time limit
0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min
