GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 198)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
70
Input XX sign - Selection of “Counter-clockwise” rotation when operated via the terminal strip for the
6KDV3 ... Q4 converters, when the reference value is only
given with one polarity.
High Counterclockwise selected
Low Counterclockwise not selected
If both Input XX sign+ and Input XX sign- are 0 or 1 the reference value is zero.
Scale input XX Scaling of the corresponding analog input
1) With a scaling factor of 1 and a Tune value inp XX = 1, 10 V or 20 mA on the
input correspond to the Speed base value.
2) With a scaling factor of 1 and a Tune value inp XX = 1, 10 V or 20 mA on the
input correspond to max possible current.
3) With a scaling factor of 1, 10V or 20 mA in the input correspond to the Pad value of 2047.
4) For the max. full scale values, refer to paragraph 6.16.3 PID function
5) With a scaling factor of 1.0 and Tune value inp XX=1, 10V or 20mA correspond
to Speed ratio = 20000.
Tune value inp XX Fine tuning of the input when the max. signal does not exactly correspond to the rated
value. Example see below.
Auto tune inp XX Automatic fine tuning of the input. If this command is given, Tune value inp XX is auto-
matically selected so that the input signal present corresponds to the max. variable value,
such as the Speed base value. Two conditions are necessary for automatic fine tuning:
Input voltage greater than 1 V or input current greater than 2 mA
Positive polarity. The value found is automatically set for the other direction for
the 6KDV3 ... Q4 converters.
Note: The automatically calculated value can, if necessary, be modified manually
via Tune value inp XX.
Offset inp XX If the analog signal has an offset or if the variable assigned to the input already has a value
although there is no input signal present, this can be compensated via the Offset inp XX.
The converter is factory set so that analog values as +10V/-10V.
With field bus operation (Option), the Input XX sign parameter specifies the sign for the rotation direction.
If a parameter is already internally assigned (e.g. if Speed ref 1 is automatically connected with the ramp output when
the ramp is enabled), it will no longer appear in the list of parameters that can be assigned to an analog input.
The Input XX sign + and Input sign - parameters cannot be addressed via the serial interface.
Example 1: The speed reference value of a drive is defined with an external voltage of 5V. With this
value the drive should reach the max. allowed speed (set via Sped base value).
As parameter Scale input XX the scaling factor 2 is entered (10V : 5V)
Example 2: An external analog reference reaches only max. 9.8V instead of 10V.
As parameter Tune value inp XX 1.020 is entered (10V : 9.8V).
The same result would have been obtained via the Auto tune inp XX function. The
appropriate parameters would have to be entered in the menu of the keypad. The maxi-
mum possible analog value (in this case 9.8 V) would have to be present at the terminal
with a positive polarity. The keypad will adjust the “Tune value” automatically if the
ENTER key is pressed.