Schneider Electric ALTIVAR 58 TRX - Manual (Page 72)

Altivar ® 58 TRX AC Drives
Type FVC Analog Inputs
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72
09/2003
Preset Setpoints for PID Regulator:
2 or 4 preset setpoints require the use of 1 or 2 logic inputs respectively:
ATV58 TYPE FVC ANALOG INPUTS
Analog Torque Limit:
This function is for load compensation, torque or traction correction applications. It is available only with
an I/O extension card with analog input AI3. The signal applied at AI3 operates in a linear fashion on the
internal torque limit (parameter TLI in the Drive menu):
If AI3 = 0 V: limit TLI x 0 = 0; If AI3 = 10 V: limit TLI.
Encoder Input Application Function with I/O Extension Card And Encoder Input:
This function provides speed reference summing. The setpoint from the encoder input is summed with
AI1 (see documentation supplied with the card). Applications include:
• Synchronization of the speed of a number of drive controllers. Parameter PLS on the DRIVE menu
is used to adjust the speed ratio of one motor in relation to that of another.
• Setpoint via encoder.
Encoder Input Application Function with Control Card:
This function provides closed loop flux vector control with sensor (inputs A, A-, B, B-). This relates to the
encoder connected to the control card. It is used for fine speed adjustments, irrespective of the state of
the load, and for control optimization (flux vector control mode in closed loop: Ctr = closed loop, DRIVE
menu).
Consistency between the motor frequency and the speed feedback is monitored in the drive controller
fault management system. If there is no encoder signal (FVC mode) or if the motor frequency and speed
feedback are not consistent, the drive controller gives a speed feedback fault and locks with code SPF.
During operation, if the difference between the motor frequency and the speed feedback is greater than
5 Hz, the drive controller gives a speed feedback fault and locks with code SPF. If the speed feedback
is greater than 1.2 x maximum frequency, the drive controller gives an overspeed fault with code SOF.
2 Preset Setpoints 4 Preset Setpoints
Assign: LIx to Pr2 Assign: LIx to Pr2, then LIy to Pr4
LIx Reference LIy LIx Reference
0 Analog reference 0 0 Analog reference
1 Process max 0 1 PI2 (adjustable)
1 0 PI3 (adjustable)
1 1 Process max