YASKAWA T1000A - Page 159

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5.4 d: Reference Settings

YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 159

Parameter Details

Input Value Polarity

The polarity of the torque reference determines the direction of the torque output from the motor, and is not determined

by the direction of the Run command (i.e., forward or reverse). The polarity of the torque reference depends on the

following:

Positive torque reference: Drive’s internal torque reference is for forward operation (rotating counter-clockwise when

looking down the motor shaft from the load side).

Negative torque reference: Drive’s internal torque reference is for reverse operation (rotating clockwise when looking

down the motor shaft from the load side).

When using an analog signal to set the frequency reference, the following situations will create a negative input signal:

• Negative voltage reference input

• Positive voltage reference input but using a negative value for the analog input bias

• Positive voltage reference input with an input terminal set to “External torque reference polarity inversion” (H1- =

78) is closed

The sign for the torque reference (positive or negative) can also be set using MEMOBUS/Modbus or a communications

option card.

Speed Limitation and Speed Limit Bias

The speed limit setting is read from the input selected in parameter d5-03. A bias can be added to this speed limit using

parameter d5-05 while parameter b5-08 determines how the speed limit bias is applied. Table 5.18 explains the relation

between these settings.

Table 5.18 Speed Limit, Speed Bias and Speed Limit Priority Selection

Torque Compensation

Analog inputs A1/A2/A3 H3-02, H3-10, or H3-06 = 14

<1>

Make sure the signal level settings for the input terminal selected

match the signal used. Refer to H3: Multi-Function Analog Inputs

on page 201 for details on adjusting analog input signals.

Analog Option Card

• F2-01 = 0

• H3-02, H3-10, or H3-06 = 14

<1>

The H3- settings become effective for the option board input

terminals. Make sure the signal level settings for the input terminal

selected match the signal used.

MEMOBUS Register 0005h

• b1-01 = 2

• Set Register 000Fh, bit 3 = 1 to enable the torque

compensation setting by register 0005h

–

Communication Option Card

b1-01 = 3

Refer to the option card manual for details about

setting the torque reference value.

–

<1> Sets analog input terminals A1, A2, and A3 to supply the speed limit, torque reference, or torque compensation. An operator programming error

oPE07 (Multi-Function Analog Input Selection Error) will occur if two analog inputs are set for the same function.

Operating Conditions

Run Command Forward Reverse Forward Reverse Forward Reverse Forward Reverse

Torque Reference

Direction

Positive (Forward) Positive (Reverse) Negative (Reverse) Negative (Forward) Negative (Reverse) Negative (Forward) Positive (Forward) Positive (Reverse)

Speed Limit

Direction

Positive (Forward) Negative (Forward) Negative (Reverse) Positive (Reverse) Positive (Forward) Negative (Forward) Negative (Reverse) Positive (Reverse)

Normal Operation

Direction

Forward Reverse Forward Reverse

Generated Torque

(d5-08 = 0)

<1>

Input Value Signal Source Settings Remarks

Speed

Torque

Limit

Internal

Torque