Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Parameter Special operation
FR-D700 SC EC 6 - 263
NOTES In normal PID control, PID control is stopped when multi-speed operation signal (RH, RM,
RL, REX signal) or JOG signal is input. In dancer control, however, PID control continues
handling the signals as the main speed.
During dancer control, Second acceleration/deceleration time of Pr. 44 and Pr. 45 are the
parameters for acceleration/deceleration time setting to the main speed command source.
They do not function as the second function.
When switchover mode is set with "6" in Pr. 79 , dancer control (PID control) is invalid.
Speed command of terminal 4 input from terminal AU is invalid when dancer control is
selected.
Acceleration/deceleration of the main speed command is the same operation as when fre-
quency command is increased/decreased by analog input.
Therefore, SU signal remains on even if the starting signal is turned on/off (always in the
constant speed state).
The DC brake operation starting frequency when turning off the starting signal is not Pr. 10
but a smaller value of either Pr. 13 or 0.5Hz.
The set frequency monitor is always variable as "main speed PID control".
The main speed setting frequency accelerates for the acceleration/deceleration time set in
Pr. 44 and Pr. 45 and the output frequency accelerates/decelerates for the acceleration/
deceleration time set in Pr. 7 and Pr. 8. Therefore, when the set time of Pr. 7 and Pr. 8 is
longer than Pr. 44 and Pr. 45, the output frequency accelerates/decelerates for the accelera-
tion/deceleration time set in Pr. 7 and Pr. 8.
For the integral term limit, a smaller value of either the PID manipulated variable (%) value
converted from the linear, interpolated Pr. 1 "Maximum frequency" with Pr. 902 and Pr. 903,
or 100% is used for limit. Although the output frequency is limited by the minimum frequency,
operation limit of the integral term is not performed.