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Menu 1
Digitax ST Advanced User Guide 29
Issue Number: 1 www.controltechniques.com
The drive can be controlled from the keypad if Pr 1.14 is set to 4. The Stop and Run keys automatically become active (the Reverse key may be
optionally enabled with Pr 6.13). The speed reference is defined by Pr 1.17. This is a read only parameter that can only be adjusted in status mode by
pressing the Up or Down keys. If keypad control mode is selected, then pressing the Up or Down keys in status mode will cause the drive to
automatically display the keypad reference and adjust it in the relevant direction. This can be done whether the drive is disabled or running. If the Up
or Down keys are held the rate of change of keypad reference increases with time.
See also Pr 1.51 on page 33 (Power-up keypad control mode reference).
See below.
The speed reference resolution is restricted to 0.1rpm from normal parameters, but the resolution can be improved by using the precision reference.
Pr 1.18 defines the coarse part of reference (either positive or negative) with a resolution of 0.1rpm and Pr 1.19 defines the fine part of the reference
(always positive) with a resolution of 0.001rpm. The final reference is given by Pr 1.18 + Pr 1.19. Therefore Pr 1.19 increases positive reference away
from zero, and decreases negative references towards zero.
When this bit is at 0 the precision reference parameters are read and stored in internal memory. Because the precision reference has to be set in two
parameters, this bit is provided to prevent the drive reading the parameters while the reference is being updated. Instead, the drive uses the value
stored in memory preventing the possibility of data skew.
1.17 Keypad control mode reference
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 1 1
Range ±SPEED_FREQ_MAX rpm
Default 0.0
Update rate 4ms read
1.18 Precision reference coarse
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 11
Range ±SPEED_FREQ_MAX rpm
Default 0.0
Update rate Background read
1.19 Precision reference fine
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
3111
Range 0.000 to 0.099 rpm
Default 0.000
Update rate Background read
1.20 Precision reference update disable
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default 0
Update rate Background read
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