112 G7 ASD Operation Manual
Ridethrough Mode
Program ⇒ Protection Parameters ⇒ Undervoltage/Ridethrough
This parameter determines the motor-control response of the drive in the event
of a momentary power outage.
Settings:
Off
Ridethrough
Stop
Direct Access Number — F302
Parameter Type — Selection List
Factory Default — Off
Changeable During Run — Yes
Number of Retries
Program ⇒ Protection Parameters ⇒ Retry/Restart
After a trip has occurred, this parameter sets the number of times tha t an
automatic system resta rt is attempted for a qualified trip.
The trip conditions listed below will not initiate the automatic Retry/Restart
function:
• OCA1, 2, or 3 (Arm Short Ckt),
• EPH1 (Input Phase Failure),
• EPH0 (Output Phase Failure),
• OCL (Startup Overcurrent),
• EF1 or 2 (Ground Fault),
• EMG (Emergency Off) ,
• EEP1 (EEPROM Fault),
• Err2 through Err9 (Main RAM/ROM Fault), or
• E-10 (Sink/Source Error),
• 13 (Speed Error), or
• 17 (Key Error).
See the section titled General Safe ty Information on pg. 1 for further
information on this set ting.
Direct Access Number — F303
Parameter Type — Numerical
Factory Default — 00
Changeable During Run — Yes
Minimum — 00
Maximum — 10
Dynamic Braking Enable
Program ⇒ Protection Parameters ⇒ Dynamic Braking
This parameter Enables/Disables the Dynamic Braking system.
Settings:
Enabled with Overload
Disabled
Dynamic Braking
Dynamic Braking uses the inertial energy of the load to produce a braking
force or it may be used to reduce the bus voltage i n an attempt to preclude an
overvoltage trip during deceleration . The inertial energy of the load drives the
rotor and induces a current into the stator of the motor.
The induced stator current (energy) is dissipated through a resistive load. The
resistive load is connected across terminals PA and PB (non-polarized). Using a
low-value, high-watt age resistance as a load for the generat ed current, the
resistive load dissipates the induced energy. The dissipated energy is the energy
that would otherwise have caused the rotor to continue to rotate.
Dynamic Braking helps to slow the load quickly; it cannot act as a holding
brake.
The Dynamic Braking function may be setup and enabled by connecting a
braking resistor from terminal PA to PB of the drive and providing the proper
information at F304, F308, and F309.
For additional information on selecting the proper resistance value for a given
application contact Toshiba’s Marketing Department.
Direct Access Number — F304
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — No
F302 F304