KW8M Eco-POWER METER
70
9.2 Input Specifications
9.2.1 Electric power input
Phase and wire system
Single-phase two-wire system
Single-phase three-wire system
Three-phase three-wire system
Three-phase four-wire system
(common)
Measured
input
voltage
Rating
Single-phase two-wire : 0-440V AC (Line voltage)
Single-phase three-wire : 0-220V AC (Phase voltage)
Three-phase three-wire : 0-440V AC (Line voltage)
Three-phase four-wire : 0-254V AC (Phase voltage)
Allowable measurement
voltage
Up to 120% of rated input voltage
Single-phase two-wire : 0-528V AC (Line voltage)
Single-phase three-wire : 0-264V AC (Phase voltage)
Three-phase three-wire : 0-528V AC (Line voltage)
Three-phase four-wire : 0-300V AC (Phase voltage)
VT ratio
1.00 to 99.99 (Set with setting mode)
*Voltage transformer (VT) is required when you measure a load
with voltage over 440V system.
*Secondary voltage rating of VT is 110V.
Input
current
Primary side rating
・
5A/50A/100A/250A/400A/600A (In case using dedicated CT)
(Select with setting mode)
・
1 to 4000A (Set with setting mode)
*Use a CT with secondary side current of 5A when measure 600A
or more.
Special
functions
Cut-off current
1.0 to 50.0%F.S (Set with setting mode)
Current threshold for
hour meter
1.0 to 100.0
％
F.S.
Accuracy
(without error
in CT and VT)
Instantaneous electric power
(active/reactive/apparent)
Integral electric power
(active/reactive/apparent)
Electricity charge
Within ± (2.0 % F.S. + 1 digit)
In case of 5 A CT mode, within ± (2.5 % F.S. + 1 digit)
(at 20 °C, rated input, rated frequency, power factor 1)
*Accuracy coverage: 5 to 100 % of rated current
Current
Within ± (1.0 % F.S. + 1 digit)
(at 20 °C 68 °F rated input, rated frequency, power factor 1)
*Accuracy coverage: 5 to 100 % of rated current
Voltage
Within ± (1.0 % F.S. + 1 digit)
(at 20 °C 68 °F rated input, rated frequency, power factor 1)
Hour meter
±
(0.01
％
+1digit) (at 20
℃
)
In case power on start or current energizing
±
(0.01
％
+1s+1 digit)
Temperature
characteristics
Within ± (1.0 % F.S. + 1 digit)
In case of 5 A CT mode, within ± (1.5 % F.S. + 1 digit)
(Range of -10 to 50 °C, rated input, power factor 1)
Frequency
characteristics
Within ± (1.0 % F.S. + 1 digit)
In case of 5 A CT mode, within ± (1.5 % F.S. + 1 digit)
(Frequency change ± 5 % based on rated frequency,
rated input, power factor 1)
9.2.2 Pulse input
Input mode
Addition (Fixed)
Max. counting speed
2kHz /30Hz (Select with setting mode)
Pulse input
Min. input signal width:
0.25ms (When 2kHz selected) /16.7ms (When 30Hz selected)
ON:OFF ratio = 1 : 1
Input signal
Contact / No contact (open collector)
・
Impedance when shorted: 1k
Ω
・
Residual voltage when shorted: Max. 2V
・
Impedance when open: 100k
Ω
Output mode
HOLD (Over count)
Number of Digit
8-digit (0 to 99999999)
