Schneider Electric vw3-a58101 Motor switching, Second torque limit, Fault reset, External fault

GP_ATV58_EN.fm Page 96 Mardi, 2. avril 2002 6:09 18

Configurable I/O Application Functions

ENGLISH

Motor switching

This function is used to switch between two motors with different power ratings using the same speed controller. An appropriate sequence must be installed on the speed controller output. Switching is carried out with the motor stopped and the speed controller locked. The following internal parameters are automatically switched by the logic command :

-	nominal motor current	- brake release current
-	injection current

This function automatically inhibits thermal protection of the second motor.

Accessible parameter : Motor power ratio (PCC) in the drive menu.

Second torque limit

Reduction of the maximum motor torque when the logic input is active.

Parameter tL2 in the adjust menu.

Fault reset

Two types of reset are available : partial or general (rSt parameter in the "fault" menu). Partial reset (rSt = RSP) :

Used to clear the stored fault and reset the speed controller if the cause of the fault has disappeared. Faults affected by partial clearing :

-	line overvoltage	-	communication fault	-	motor overheating
-	DC bus overvoltage	-	motor overload	-	serial link fault
-	motor phase loss	-	loss of 4-20mA	-	speed controller overheating
-	overhauling	-	external fault	-	overspeed

General reset (rSt = RSG) :

This inhibits all faults (forced operation) except SCF (motor short-circuit) while the assigned logic input is closed.

Forced local mode

Used to switch between line control mode (serial link) and local mode (controlled via the terminals or via the display module).

Auto-tuning

When the assigned logic input changes to 1 an auto-tuning operation is triggered, in the same way as parameter tUn in the "drive" menu.

Caution : Auto-tuning is only performed if no command has been activated. If a "freewheel stop" or "fast stop" function is assigned to a logic input, this input must be set to 1 (active at 0).

Application : When switching motors, for example.

Auto-man PI, preset PI setpoints : PI operation (see page 97)

Torque limitation by AI

This function is only accessible if the analogue input AI3 is assigned to torque limit. If there is not a logic input configured on TL2 : second torque limit, the limit is directly given by AI3.

If a logic input is configured on TL2 second torque limit.

-When the input is 0 the limit is given by tLi

-When the input is 1 the limit is given by AI3

External fault

When the assigned logic input changes to 1, the motor stops (according to the configuration of the LSF Stop+flt parameter in the Drive menu), and the drive locks in EPF external fault fault mode.

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