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shows the unit lists in the metering funciton.
Metering items
Voltage (V)
Current (I)
Active power (P)
Reactive power (Q)
Apprent power (S)
Diminishing a very small value to display zero
9.2.3
If the metering value is less than certain value, the metering value displayed on HMI will be
zero (0) value. The user can define the certain value by settings [I-Valid Level] for currents and
[V-Valid Level] for voltages.
In the setting [I-Valid Level], the range is 0.10-5.00(%) and default value is 4.00(%), which
means a percentage value of 1(A). In the setting [V-Valid Level], the range is 0.10-5.00(%) and
default value is 0.30(%), which means a percentage value of 63.5(V).
Flow settings for active/reactive/apparent powers
9.2.4
The user should set the rules for the metering P, Q, and S
Metering in active power (P)
(i)
When the metering function measures the value for supplying power, the user should set Send
for the [Power]. Conversely, if the metering function should operate for absorbing power, set
Receive for the setting. Figure 9.2-3 illustrates the sign of the active power (P), which is
polarized with the voltage (V). In Figure 9.2-3.a exemplifies the metering function operating
for the supplying power so that the value P will have plus (+) sign (i.e., the I lags the V, which
shown in Quadrant IV). In Figure 9.2-3.b, the value P will have minus (–) sign when the I lags
the V, provided Receive is set for the setting.
Receiving
II
(P<0)
III
(P<0)
a. Metering (P) for supplying power
[Power]=Send
Figure 9.2-3 Sign of the active power (P) ruled by setting [Power]
Table 9.2-3 Selection of units to display
Settings
[V-Display Unit]
[I-Display Unit]
[P-Display Unit]
[Q-Display Unit]
[S-Display Unit]
Sending
I
(P>0)
V
IV
I
(P>0)
- 777 -
Selection of a unit to display
Volt (V) or kilo-volt (kV)
Ampare (A) or kilo-ampare (kA)
Kilo-watt (kW) or Mega-watt (MW)
Kilo-var (kvar) or Mega-var (Mvar)
Kilo-VA (kVA) or Mega-VA (MVA)
Receiving
II
(P>0)
III
I
(P>0)
b. Metering (P) for absorbing power
[Power]=Receive
6F2T0207 (0.01)
Sending
I
(P<0)
V
(+)
IV
(P<0)
GRE200 (5,6)
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