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F303
Retry Selection
Program Protection Retry/Restart
After a trip has occurred, this parameter sets the number of times that an
automatic system restart is attempted for a qualified trip.
The trip conditions listed below will NOT initiate the automatic Retry/Restart
function:
•
Input Phase Loss (Input Phase Failure)
•
Output Phase Loss (Output Phase Failure)
•
Output Current Protection Fault
•
Output Current Detector Error
•
Load Side Over-Current at Start
•
Earth Fault (Ground Fault)
•
Over-Current During Acceleration
•
Arm Over Current at Start-Up
•
DBR Resistor Over-Current
•
Low-Current
•
Voltage Drop in Main Circuit
•
EEPROM Data Fault (EEPROM Fault)
•
Flash Memory/Gate Array/RAM-ROM Fault
•
CPU Fault
•
Emergency Off (EMG)
•
Communication Error
•
Option Fault
•
Sink/Source Setting Error
•
Over-Speed Error
•
Over-Torque
•
Key Error
•
External Thermal Error
•
Externally-Controlled Interrupt
See the section titled
System Setup Requirements on pg. 9
information on this setting.
Dynamic Braking Selection (not used)
Program Protection Dynamic Braking
This parameter is model-specific and has no function on the WX9 ASD.
Settings:
0 — Off
1 — On with Overload
Dynamic Braking uses the inertial energy of the load to produce a braking
force. The inertial energy of the load drives the rotor and induces a current into
the stator of the motor that may be used to reduce the bus voltage in an attempt
to preclude an over-voltage trip during deceleration.
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-wattage resistance as a load for the generated 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 and PB of the drive and providing the proper
information at F304, F308, and F309.
WX9 ASD Installation and Operation Manual
Direct Access Number — F303
Parameter Type — Numerical
Factory Default — 0
Changeable During Run — Yes
Minimum — 0
Maximum — 10
for additional
Direct Access Number — F304
Parameter Type — Selection List
Factory Default — Off
Changeable During Run — Yes
F304
121
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