2
IM 77C01E01-03E
2nd
Edition
Sep
. 2
9
, 20
17
1.2
Setting the Voltage Range
This section explains how to set the voltage range by taking as an example the case when the voltage range is changed from 300 V to 600 V.
Using
or
, show the Voltage
Range screen.
The Specification Change Confirmation screen
appears.
Measured Value screen
Startup screen
VT Ratio screen
2
1
3
Phase and Wire System screen
6
Specification Change Confirmation screen
Specification Change Confirmation screen
4
The PR300 shows the station number for about 5
seconds, then the Measured Value screen * appears.
The Phase and Wire System screen appears.
7
The Voltage Range screen appears.
The Voltage Range Setting screen appears.
5
8
9
Voltage Range screen
Voltage Range Setting screen
Voltage Range Setting screen
Turn on the PR300.
Hold down
for at least 3 seconds.
The parameter (VT ratio) appears.
Using or , show
on
the lower display.
Press
once.
Press
once.
Current value
Parameter symbol for voltage range
Setpoint
Simultaneously hold down
+
for at least 3 seconds.
Press
once to blink the setpoint.
Using
or
, select the setpoint.
2. Setting the VT and CT Ratios
NOTE
Set the VT and CT ratios so that the value of “secondary rated
power
ⴛ
VT ratio
ⴛ
CT ratio” is smaller than 10 GW. If this value
exceeds 10 GW, the updated VT or CT ratio will not be
incorporated but revert to the current value before change.
2.1
Setting the VT Ratio
This section explains how to set the VT ratio by taking as an example the
case when the VT ratio is changed from the initial value (1) to 4.
Prior to proceeding to the following steps, ensure that the PR300 is turned
on, and the Measured Value screen is displayed.
1
Measured Value screen
VT Ratio screen
1
2
VT Ratio Setting screen
VT Ratio Setting screen
VT Ratio Setting screen
VT Ratio screen
3
4
If you do not operate any key for more than 5
minutes on the Parameter screen, the PR300
automatically returns to the Measured Value screen.
Setting completed.
Hold down
for at least 3 seconds.
The parameter (VT ratio) appears.
Current value
Press
once.
The screen changes to the one for setting the
parameter and the alterable digit blinks.
Using
or
, change the setpoint.
Setpoint
To move to the digit to be changed, use the following
keys:
To the left
To the right
Press
once to blink the setpoint.
5
To return to the Measured Value screen, hold down
.
When proceeding to set the CT ratio, press once
and start from step
3
in Section 2.2, “Setting the CT Ratio.”
Press
once while the setpoint is blinking.
The setpoint is confirmed and the PR300 returns to the VT Ratio screen.
To re-set the parameter:
Press any key other than while all digits of the setpoint are
blinking.
The PR300 returns to the initial setting screen.
Parameter (VT Ratio) Setting Types and Ranges
Parameter Symbol
Parameter Name
Setting Type Setting Range (Details)
Initial Value
(Factory-set
Value)
VT ratio
Integral
numeric
value
1 to 6000
1
2.2
Setting the CT Ratio
This section explains how to set the CT ratio by taking as an example the
case when the CT ratio is changed from the initial value (1.00) to 10.00.
Prior to proceeding to the following steps, ensure that the PR300 is turned
on, and the Measured Value screen is displayed.
To return to the Measured Value screen, hold down
.
Measured Value screen
VT Ratio screen
1
2
3
CT Ratio screen
5
CT Ratio Setting screen
The alterable digit blinks.
6
CT Ratio Setting screen
CT Ratio Setting screen
CT Ratio screen
Setting completed.
CT Ratio Setting screen
4
Current value
Setpoint
Hold down
for at least 3 seconds.
The parameter (VT ratio) appears.
Press
once.
The parameter (CT ratio) appears.
Press
once.
The screen changes to the one for setting the parameter
and the decimal point blinks.
Press
once to fix the position of the decimal point.
To move the decimal point, use the following keys:
To the left
To the right
Using
or
, change the setpoint.
To move to the digit to be changed, use the following keys:
To the left
To the right
To re-set the parameter:
Press any key other than while all digits of the setpoint are
blinking.
The PR300 returns to the initial setting screen.
If you do not operate any key for more than 5
minutes on the Parameter screen, the PR300
automatically returns to the Measured Value screen.
Press
once to blink the setpoint.
7
Press
once while the setpoint is blinking.
The setpoint is confirmed and the PR300 returns to the CT Ratio screen.
Parameter (CT Ratio) Setting Types and Ranges
Parameter Symbol
Parameter Name
Setting
Type
Setting Range (Details)
Initial Value
(Factory-set
Value)
CT ratio
Floating-point
numeric
value
1.00
0.05 to 32000
Voltage Range Setting screen
11
Measured Value screen
Setting completed.
Voltage Range screen
When proceeding to set the phase and wire system, press
or
to show the Phase and Wire System screen,
with this screen (figure on the left) shown as is. After
showing the Phase and Wire System screen, start from step
6
in Section 1.1, “Setting the Phase and Wire System.”
Hold down
for at least 3 seconds.
10
To re-set the parameter:
Press any key other than
while all digits of the setpoint are blinking.
The PR300 returns to the initial setting screen.
Press
once while the setpoint is blinking.
The PR300 shows the Startup screen for about 5 seconds,
then the Measured Value screen appears.
The setpoint is confirmed and the PR300 returns to the
Voltage Range screen.
NOTE
•
The voltage range of single-phase three-wire system is fixed at
300V (between P0 and P1, P0 and P2). The voltage range
cannot be selected.
•
Select the voltage range of three-phase four-wire system, by
the phase voltage (between P0 and P1, P0 and P2, P0 and P3).
Range of Voltage Range Options
Parameter Symbol
Parameter Name
Setting
Type
Setting Range (Details)
Initial Value
(Factory-set
Value)
Voltage range
Selection
150V
300V
600V
300V
* The initial value of the Measured Value screen (display pattern) is Upper
display: Current (phase switch indication), Middle display: Voltage (phase
switch indication), and Lower display: Active power. For the display
pattern setting procedures, refer to the PR300 Power and Energy Meter
User's Manual (IM 77C01E01-01E).
