H9 ASD Installation and Operation Manual 139

Synchronized Acceleration Tim e

Program ⇒ Protection ⇒ Undervoltage/Ridethrough
In the event that the Ridethrough function activates in a multiple-motor
application it will be necessary to manage the accelerating motors
synchronously as not to damage the product being processed (e.g., wire spools,
bobbin winder for textile machines, etc .).
This parameter is used to minimize the product breakage during a momentary
power outage. This function or ch estrates the acceleratio n of mul ti ple machines
simultaneously or makes them reach their respective command frequencies
simultaneously by regulating their ac celeration times.
See parameter F302 for more information on this setti ng.
Direct Access Number — F318
Parameter Type — Numerical
Factory Default — 2.0
Changeable During Run — Yes
Minimum — 0.10
Maximum — 6000
Units — Seconds

Drooping Gain

Program ⇒ Feedback ⇒ Drooping Control
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 mechanical ly coupled motors. Un like Stall, whic h re d uc e s th e
output frequency in order to limit the load once the load reaches a preset level,
Drooping can decrease or increase t he 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 counter part and may become overloaded.
Drooping Control allows the overloaded moto r to slow down, thus s hedding
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

Program ⇒ Feedback ⇒ Drooping Control
This parameter sets the moto r 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 — 320.0
Units — Hz

Speed at F320 Drooping Gain

Program ⇒ Feedback ⇒ Drooping Control
This parameter sets the motor speed when at th e 100% output torque g ain while
operating in the Drooping Control mode. This function determines the speed
of the individual motors at the 100% Drooping Gain setting for moto rs that
share the same load.
Direct Access Number — F322
Parameter Type — Numerical
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 320.0
Units — Hz
F318 F322