Toshiba Q9 Series, Installation And Operation Manual, Page: 124 / 233

114 Q9 ASD Installation and Operation Manual
Drooping Gain
No Path — Direct Access Only
This parameter sets the effective 100% output torque level while operating in the
Drooping Control mode. This value is the upper torque limit of the motor being
driven by a given ASD while operating in the Drooping Control mode.
Note: The maximum frequency output is not limited by the setting of F011
while operating in the Drooping Control mode.
Drooping
Drooping Control, also called Load Share, is used to share the load among two
or more mechanically coupled motors. Unlike Stall, which reduces the output
frequency in order to limit the load once the load reaches a preset level, Drooping
can decrease or increase the V/f setting of a motor to maintain a balance between
the output torque levels of mechanically coupled motors.
Because of variances in gearboxes, sheaves, belts, motors, and since the speed of
the motor is constrained by the mechanical system, one motor may experience
more load than its counterpart and may become overloaded. Drooping Control
allows the overloaded motor to slow down, thus shedding load and encouraging a
lightly-loaded motor to pick up the slack.
The goal of Drooping Control is to have the same torque ratios for mechanically
coupled motors.
Direct Access Number — F320
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.00
Maximum — 100.0
Units — %
Speed at 0% Drooping Gain
No Path — Direct Access Only
This parameter sets the motor speed when at the 0% output torque gain while
operating in the Drooping Control mode. This function determines the lowest
speed that Drooping will be in effect for motors that share the same load.
Direct Access Number — F321
Parameter Type — Numerical
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 299.0
Units — Hz
Speed at F320 Drooping Gain
No Path — Direct Access Only
This parameter sets the motor speed when at the 100% output torque gain while
operating in the Drooping Control mode. This function determines the speed of
the individual motors at the 100% Drooping Gain setting for motors that share
the same load.
Direct Access Number — F322
Parameter Type — Numerical
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 299.0
Units — Hz
Drooping Insensitive Torque
No Path — Direct Access Only
This parameter defines a torque range in which the Drooping Control settings
will be ignored and the programmed torque settings will be followed.
Direct Access Number — F323
Parameter Type — Numerical
Factory Default — 10.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 100.0
Units — %
F320 F323