Schneider Electric Altivar 58 VW3-A58101 Manual de usuario descargar pdf (Pagina 68)

ALTIVAR

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58 Keypad Display VVDED397047US R8/01

Chapter 2 — Menus 08/01

Assignment of AI2 and AI3

Summing Speed Reference: The frequency setpoints given by AI2 and

AI3 can be summed with AI1.

Speed Regulation with Tachogenerator: (Assignment on AI3 only with

an I/O extension card, VW3A58201U)

An external divider bridge is required to adapt the voltage of the

tachogenerator. The maximum voltage must be between 5 and 9 V. A

precise setting is then obtained by setting the dtS parameter available in

the 2—Adjust menu.

PTC Probe Processing: (only with an I/O extension card using the

analog input). Used for the direct thermal protection of the motor by

connecting the PTC probes in the motor windings to analog input AI3.

Total resistance of the probe circuit at 20 °C = 750 Ω.

Torque Limit: (Assignment on AI3 only with an I/O extension card

VW3A58201U). This function can only be accessed if an analog input has

been assigned to the torque limit. If the logic input is at 0, the torque is

limited by setting tL1 or tL2. If the logic input is at 1, the torque is limited

by the analog input assigned to this function.

The signal applied at AI3 operates in a linear fashion on the internal

torque limit (parameter TLI in the 3—Drive menu):

— If AI3 = 0 V: limit = TLI x 0 = 0

— If AI3 = 10 V: limit = TLI

Using the Controller Relay and Logic Outputs

The relay R2 on the drive controller or the logic output (LO) on an option

card can be configured as follows:

Output Contactor Command (OCC)

The Output Contactor Command function allows the drive controller to

command a contactor between the controller and the motor. The

controller closes the contactor when a run command is given. When there

is no longer any current in the motor, the controller opens the contactor.

When using an output contactor, set outphase loss (OPL) to No.

NOTE: If the braking by DC injection function is configured, do not exceed

contactor rating, because the contactor will not open until the end of

braking.

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Schneider Electric Altivar 58 VW3-A58101 Manual de usuario Pagina 68