Fuji Electric FRENIC MEGA G2 Series - Page 482

5.3 Description of Function Codes 5.3.9 d codes (Applied functions 2)
5-298
 Output filter (d06/A48/b48/r48)
This specifies the time constant for the primary delay filter for speed regulator output.
Setting range: 0.000 to 0.100 (s)
This is used when machine resonance such as hunting or vibrations cannot be suppressed by adjusting the P gain
or integral time. Generally speaking, the resonance amplitude can be decreased by increasing the output filter time
constant, but increasing it too much may cause the system to become unstable.
 Select speed control parameter 1, 2 -- “MPRM1”, “MPRM2” (E01 to E09 data = 78, 79)
The combination of the ON/OFF states of digital input signals “MPRM1” and “MPRM2” selects one of 4 different
level speed control parameter sets. These parameters are valid under vector control with speed sensor, V/f control
with speed sensor, and sensorless vector control.
Input signal
Speed control constant
“MPRM2”
“MPRM1”
OFF
OFF
Speed control constant 1: d01 to d06
OFF
ON
Speed control constant 2: A43 to A48
ON
OFF
Speed control constant 3: b43 to b48
ON
ON
Speed control constant 4: r43 to r48
 Relationship between motor switching and speed control constant selection
If neither speed control constant 1 “MPRM1” nor speed control constant 2 “MPRM2” has been assigned to an input
terminal, by switching the motor with input terminal “M2”, “M3”, or “M4”, speed control constants 1 to 4 are assigned
to motor 1 to motor 4.
If speed control constant 1 “MPRM1” or speed control constant 2 “MPRM2” has been assigned to an input terminal,
by switching the motor with input terminal “M2”, “M3”, or “M4”, speed control constants 1 to 4 can be selected with
the terminal “MPRM1” or “MPRM2”. Furthermore, the parameter switching function (A42, b42, r42 = 1) will be invalid,
and only the motor switching function will be valid (normally equivalent to A42, b42, r42 = 0).
 ASR switching time (d25)
Speed control parameters switching by “MPRM1” and “MPRM2” signals is possible even during motor drive
operation. For example, speed control P (Gain) and I (Integral time) listed can be switched. Switching these
parameters during operation may cause an abrupt change of torque and result in a mechanical shock, depending
on the driving condition of the load.
To reduce such a mechanical shock, the inverter decreases the abrupt torque change using the ramp function of
ASR switching time (d25).
• Data setting range: 0.000 to 1.000 (s)