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Diagnostic test point scaling.
Feedback: 100% = 1.59v peek
Demand:
220% = 5v peek
(Centred on -5v)
Diagnostic test points:
These are of two types:
•
Analogue current control diagnostics
•
Peek memory location diagnostic
Current control diagnostics:
The current control loop has two channels, here called 1 and 3 (for historical reasons).
Each channel has a current feedback, a current demand, and a resulting current error. The current error is taken to a
comparator, and a sawtooth waveform is taken to the other input of the comparator to produce the PWM waveform.
The current feedback is centred on zero, and scaled such that rated drive current gives 1.6v peak.
The current demand is centred on 5v, and is scaled such that rated drive current is 2.04v peak, i.e. 5v + or - 2.04v.
Peek memory location diagnostic (Peek Diag.):
This displays the 'peeked' value as an analogue output.
A Tag may be displayed by setting PEEK TAG to the desired Tag number. The default is speed feedback. The value
can be scaled using PEEK SCALE.
An absolute memory location may be displayed by setting PEEK TAG to zero and selecting the memory location with
PEEK DATA This function requires the supper password.
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - info@sdsdrives.com
