Name: Control Techniques unidrive sp
Brand: Control Techniques
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Parameter

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Parameter

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Advanced parameter

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40 Unidrive SP Advanced User Guide

www.controltechniques.com Issue Number: 7

This voltage is used as the control level for standard ramp mode. If this parameter is set too low the machine will coast to rest, and if it is set too high

and no braking resistor is used the drive may give an OU trip. The minimum level should be greater than the voltage produced on the DC bus by the

highest supply voltage. Normally the DC bus voltage will be approximately the rms supply line voltage x √2.

The acceleration rate is selected as follows.

0 Ramp rate selection by terminal input

1 - 8 Ramp rate defined by parameter number, i.e. 1 = Pr 2.11, 2 = Pr 2.12, etc.

9 Ramp rate selection by Pr 1.50

When Pr 2.10 is set to 0 the acceleration ramp rate selected depends on the state of bit Pr 2.32 to Pr 2.34. These bits are for control by digital inputs

such that ramp rates can be selected by external control. The ramp rate selected depends on the binary code generated by these bits as follows:

When Pr 2.10 is set to 9 the appropriate acceleration rate is automatically selected depending on the value of Pr 1.50, and so an acceleration rate can

be programmed to operate with each reference. Since the new ramp rate is selected with the new reference, the acceleration applies towards the

selected preset if the motor needs to accelerate to reach the preset.

2.08 Standard ramp voltage

Drive modes Open-loop, Closed-loop vector, Servo

Coding