Control Techniques Digitax ST - Page 62

Menu 3
Parameter
structure
Keypad and
display
Parameter x.00
Parameter
description format
Advanced parameter
descriptions
Serial comms
protocol
Electronic
nameplate
Performance
62 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
The drive encoder input can be used as a reference to control a drive parameter. The drive encoder reference parameter (Pr 3.45) gives the speed of
the encoder input as a percentage of the maximum drive encoder reference provided that the number of encoder lines per revolution (Pr 3.34) has
been set up correctly. This may then be scaled and routed to any non-protected drive parameter.
At power-up Pr 3.48 is initially zero, but is set to one when the drive encoder and any encoders connected to position category modules have been
initialized. The drive cannot be enabled until this parameter is one.
If any trips occur that could indicate that the encoder system is no longer initialized correctly (i.e. EnC2-EnC8 and Enc11-Enc17), or the internal 24V
or encoder power supplies are overloaded (i.e. EnC1 or PS.24V), Pr 3.48 is set to zero and the drive cannot be enabled until the encoder is re-
initialized. It is likely that the failure of either of these supplies will cause one of the other encoder trips and it should be noted that EnC1 or PS.24V
trips can override EnC2-EnC8 and Enc11-Enc17 trips so that the power supply overload is not mistaken for an encoder error.
When this parameter is set to one, additional information for the motor object can be transferred from Pr 18.11 to Pr 18.17 as shown below.
If Pr 3.50 is set to one Pr 3.28, Pr 3.29 and Pr 3.30 are not updated. If this parameter is set to zero these parameters are updated normally.
3.46
Drive encoder reference destination
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 2 1111
Range Pr 0.00 to Pr 21.50
Default Pr 0.00
Update rate Read on reset
3.47 Re-initialise position feedback
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Update rate Background read
3.48 Position feedback initialised
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Update rate Background write
3.49 Full motor object electronic nameplate transfer
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default 0
Update rate Read on reset
User parameter Motor object parameter
Pr 18.11 Motor object version number
Pr 18.12 Motor type (MSW)
Pr 18.13 Motor type (LSW)
Pr 18.14 Motor manufacturer
Pr 18.15 Motor serial number (MSW)
Pr 18.16 Motor serial number
Pr 18.17 Motor serial number (LSW)
3.50 Position feedback lock
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default 0
Update rate 4ms read