Control Techniques Digitax ST Advanced User's Manual page 38

Parameter
Menu 2
structure
2.08 Standard ramp voltage
Bit SP
Coding
Range 0 to DC_VOLTAGE_SET_MAX V
200V rating drive: 375
Default
400V rating drive: EUR: 750 / USA: 775
Update rate Background read
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.
2.10 Acceleration rate selector
Bit SP
Coding
Range 0 to 9
Default 0
Update rate 4ms read
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:
Pr 2.34 Pr 2.33
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
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.
2.11 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
Bit SP
Coding
Range 0.000 to 3,200.000 s/1000rpm
Default 0.200
Second motor
Pr 21.04 for Pr 2.11 only
parameter
Update rate 4ms read
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.
38
Keypad and
Parameter x.00
display
FI DE Txt VM DP ND RA NC NV
1
FI DE Txt VM DP ND RA NC NV
Pr 2.32 Ramp defined by
0 Pr 2.11
1 Pr 2.12
0 Pr 2.13
1 Pr 2.14
0 Pr 2.15
1 Pr 2.16
0 Pr 2.17
1 Pr 2.18
FI DE Txt VM DP ND RA NC NV
3
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Parameter Advanced parameter
description format descriptions
PT US RW BU
1 1 1
PT US RW BU
1 1
PT US RW BU
1 1
Serial comms Electronic
protocol nameplate
PS
1
PS
1
PS
1
Digitax ST Advanced User Guide
Issue Number: 1
Performance