9. COMMUNICATION DATA DESCRIPTION
IMS01T28-E4
9-96
Power feed forward (PFF) selection
RKC communication
identifier
JK
Modbus
register address
ch1: 0425H (1061)
ch2: 0426H (1062)
Use to select Use/Unuse of the Power feed forward (PFF) function.
Attribute:
R/W
Digits:
7 digits
Number of data:
2 (Data of each channel)
Data range:
0: Unused
1: Used
Factory set value:
0
Related parameters:
PFF power supply frequency (P. 9-95),
Measurement power supply frequency (P. 9-97), PFF input voltage (P. 9-97),
PFF reference voltage (P. 9-98),
Output compensation factor for PFF reference voltage (P. 9-98),
Output compensation captured value for PFF reference voltage (P. 9-99),
PFF gain (P. 9-99)
Function:
The Power feed forward function monitors the electrical load through a dedicated
transformer, and adjusts manipulated output to compensate power supply fluctuation.
If the Power feed forward (PFF) input voltage is decreased to about 70 % or less of
the rated value, the Power feed forward function is turned off. At this time, the
control mode will return to the normal control (the same control as without the
Power feed forward function).
The Power feed forward function is used together with the Output change rate limiter
function, the Manipulated output value may exceed the limit of the Output change rate
limiter.
When the Power feed forward function is set to “1: Used,” the function is turned off under
the following condition.
When no Power feed forward (PFF) input is used (no Power feed forward transformer is connected)
When Power feed forward (PFF) input voltage is decreased to about 70 % or less of the rated value
Always use the dedicated power feed transformer (PFT-02A) included.
PID compute
Output change
rate limiter
Power feed
forward
Actual Manipulated
output value (MV)
Relationship between the Power feed forward and Output change rate limiter
Z-TIO-G
module
SSR
Control output
Controlled
object
Operating unit
Load power supply
Sensor input
Control
output
Power feed forward transformer
(PFF input)
Содержание Z-TIO-G
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