Yokogawa Value Series FX1000 - Manual (Page 108)

3-26
IM 04L21B01-17EN
Description • Use parameter p2 to set the VT ratio.
VT ratio (p2): 10 to 60000
Set this value using an integer without a
decimal point. (10 means “1.0.”)
• About the CT ratio setting
The range of the CT ratio is 0.05 to 32000.
Parameters p4 (the integer) and p3 (the
decimal place) are used to display the value.
(Example: If p3 is 2 and p4 is 12345, the CT
ratio is 123.45.)
• The range of parameter p3 is 0 to 2.
The ranges of p4 in relation to p3 are
shown in the following table.
Parameter Range
Setting
p3 p4
2 5 to 99999 0.05 to 999.99
1 10000 to 99999 1000 to 9999.9
0 10000 to 32000 10000 to 32000
For parameters p3 and p4, either set both
parameters, or omit both parameters.
• Set the VT ratio and CT ratio so that they meet
the following condition.
(Secondary rated power Ч 1.2 Ч VT ratio × CT
ratio) < 10 (GW).
The secondary rated power is shown in the
following table.
Input Voltage Secondary Rated
Power
Single-phase
two-wire system
120 V 100 W
240 V 200 W
Single-phase
three-wire system
200 V 200 W
Three-phase
three-wire system
120 V 200 W
240 V 400 W
Setting the low-cut power
Syntax NP p1,p2
p1 Setting type (LOWCUT)
p2 Low-cut power (5 to 2000)
Query NP[p1[,p2]]?
Example Set the low-cut power to 1.00.
NPLOWCUT,100
Description Use parameter p2 to set the low-cut power. The
range is 5 to 2000, which corresponds to actual
settings of 0.05 to 20.00.
FR Sets the interval for acquiring
data to the FIFO buffer
Syntax FR p1,p2
p1 Fixed to 1
p2 FIFO acquisition interval (125MS, 250MS,
500MS, 1S, 2S, 5S)
Query FR?
Example Set the FIFO acquisition interval to 1 second.
FR1,1S
Description • Set the acquisition interval to a value that is
greater than or equal to the scan interval.
• If you use the XV command or the FX screen
to set the scan interval to a value greater than
the acquisition interval, the acquisition interval
is automatically set to the same value as the
scan interval.
• The FX has a FIFO (First In First Out) ring
buffer. The FX acquires measured values and
computed values in the internal memory at
predetermined time intervals from the time that
the FX is turned on. The FX outputs the data
in internal memory when it receives an FF
command. The FX retains the previous output
position for each connection and updates the
position when it outputs the next set of data
upon the receipt of another FF command. This
scheme compensates for the communication
delay and the differences in the processing
power of the measurement PCs. Provided that
a measurement PC reads the data before the
ring buffer is overwritten, this scheme makes it
possible to retrieve data without any dropouts.
For details on the FIFO data output process,
see appendix 5.
3.4 Setting Commands