Download Variable speed drives for asynchronous motors

Functions (continued)
Variable speed drives
for asynchronous motors
563723
Altivar 31
Fault management with PowerSuite for PC
# Fault management
There are different modes of operation on a resettable fault:
5Freewheel stop
5The drive switches to the fallback speed
5The drive maintains the speed at which it was operating when the fault occurred
until the fault disappears
5Stop on ramp
5Fast stop
The detected resettable faults are as follows:
5drive overheating
5motor overheating
5CANopen bus fault
5Modbus serial link failure
5external faults
5loss of 4-20 mA signal
# Fault reset
Used to clear the last fault by means of a logic input.
The restart conditions after a reset to zero are the same as those of a normal
power-up.
Resets the following faults: overvoltage, overspeed, external fault, drive overheating,
motor phase loss, DC bus overvoltage, loss of 4-20 mA reference, load veering,
motor overload if the thermal state is less than 100%, serial link fault.
"Line supply undervoltage" and "line supply phase loss" faults are reset automatically
when the line supply is restored.
Function suitable for applications where the drives are difficult to access, for example
on moving parts in material handling systems.
# General reset (resets all faults)
This function can be used to inhibit all faults, including thermal protection (forced
operation) and may cause irreparable damage to the drive.
Function suitable for applications where a restart can be vital (conveyor in a furnace,
smoke extraction station, machine with hardening products which need to be
removed).
The function is enabled by a logic input.
Fault monitoring is active if the logic input is at state 1.
All faults are reset on a change of state
of the logic input.
# Controlled stop on loss of line supply
Used to control motor stopping on a loss of line supply.
Function suitable for material handling, machines with high inertia, continuous
product processing machines.
Type of stop possible:
5locking of the drive and freewheel stop
5stop which uses the mechanical inertia to maintain the drive power supply as long
as possible
5stop on ramp
5fast stop (depends on the inertia and the braking ability of the drive)
# Stop mode in the event of a fault
The type of stop that occurs on detection of a fault can be configured as normal,
freewheel or fast for the following faults:
5external fault (detection enabled by a logic input or a bit in a Modbus or CANopen
control word)
5motor phase loss fault
If a downstream contactor is being used between the drive and the motor, the motor
phase loss fault should be inhibited.
Presentation:
pages 2 to 9
56
Characteristics:
pages 10 to 13
References:
pages 14 to 17
Dimensions:
pages 30 to 35
Schemes:
pages 36 to 39
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