Control Techniques Digitax ST - Page 39

Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
Menu 2
Digitax ST Advanced User Guide 39
Issue Number: 1 www.controltechniques.com
The jog acceleration rate is only used when accelerating towards the jog reference and when changing the jog reference.
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 2.21, 2 = Pr 2.22, etc.
9 Ramp rate selection by Pr 1.50
When Pr 2.20 is set to 0 the deceleration ramp rate selected depends on the state of bit Pr 2.35 to Pr 2.37. 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 2.20 is set to 9 the appropriate deceleration rate is automatically selected depending on the value of Pr 1.50, and so a deceleration rate can
be programmed to operate with each reference. Since the new ramp rate is selected with the new reference, the deceleration applies towards the
selected preset if the motor needs to decelerate to reach the preset.
If an deceleration rate is selected where the parameter is set to 0.000 the deceleration ramp is disabled and the reference changes instantly to its new
value during deceleration.
2.19 Jog acceleration rate
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0.000 to 3200.000 s/1000rpm
Default 0.000
Update rate Background read
2.20 Deceleration 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
02.37 02.36 02.35 Ramp defined by
00 0 Pr 2.21
00 1 Pr 2.22
01 0 Pr 2.23
01 1 Pr 2.24
10 0 Pr 2.25
10 1 Pr 2.26
11 0 Pr 2.27
11 1 Pr 2.28
2.21 Deceleration rate 1
2.22 Deceleration rate 2
2.23 Deceleration rate 3
2.24 Deceleration rate 4
2.25 Deceleration rate 5
2.26 Deceleration rate 6
2.27 Deceleration rate 7
2.28 Deceleration 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 21.05 for Pr 2.21 only
Update rate 4ms read