Menu 2
Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
38 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
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.
If an acceleration rate is selected where the parameter is set to 0.000 the acceleration ramp is disabled and the reference changes instantly to its new
value during acceleration.
2.08 Standard ramp voltage
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 111
Range 0 to DC_VOLTAGE_SET_MAX V
Default
200V rating drive: 375
400V rating drive: EUR: 750 / USA: 775
Update rate Background read
2.10 Acceleration rate selector
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 9
Default 0
Update rate 4ms read
Pr 2.34 Pr 2.33 Pr 2.32 Ramp defined by
00 0 Pr 2.11
00 1 Pr 2.12
01 0 Pr 2.13
01 1 Pr 2.14
10 0 Pr 2.15
10 1 Pr 2.16
11 0 Pr 2.17
11 1 Pr 2.18
2.11 Acceleration rate 1
2.12 Acceleration rate 2
2.13 Acceleration rate 3
2.14 Acceleration rate 4
2.15 Acceleration rate 5
2.16 Acceleration rate 6
2.17 Acceleration rate 7
2.18 Acceleration rate 8
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
3111
Range 0.000 to 3,200.000 s/1000rpm
Default 0.200
Second motor
parameter
Pr 21.04 for Pr 2.11 only
Update rate 4ms read
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