Motor Potentiometer - Santerno DCREG2 Series User Manual

15P0059B3
USER MANUAL
6.3

MOTOR POTENTIOMETER

This function allows to use an internal variable as a reference, that can be increased or decreased using a
digital input Up and a digital input Down or using the arrow keys.
1. Reference. At least one of the sources selected for the reference through parameters C105 ... C108
(RefSelx) must correspond to UpDownRef; therefore, the LOC REF LED is to be on or flashing.
In the standard use of the Motor Potentiometer function, this source is the one selected to form the main
reference (Main Ref), and the reference obtained will be normally configured as a speed reference, even
though it can be configured as a current reference.
2. Increase / decrease commands. The UpDownRef internal reference may be increased or decreased
using the commands coming from max. three sources among the four available sources that can be
selected through parameters C110 ... C112 (SeqSelx). The terminal, serial connection or field bus
commands may be used after configuring one of parameters C130 ... C135 (MDIx) as 14:Up and 15:Dn,
or the "  " and "  " keys. If an increase command is simultaneously entered with a decrease command,
the former will cancel the latter and vice-versa. Two contemporary increment / decrement commands
have the same effect as a single command.
3. Ramps over the increment / decrement commands. Whenever an increment / decrement command
is enabled, the internal reference is increased or decreased according to the ramp set through par. P040
(UpDnRefRamp). When the motor is running, that ramp is in series with the ramp with the Ref n
reference, which is determined by parameters P030 ... P033, so the ramp obtained is the longer one.
4. Polarity. Par. P250 (UpDnRefPol) allows to program whether the internal reference may range from -
100 ... +100% or whether it may vary between the values with sign - or +.
5. Storing the last reference set. In order to keep the last value stored at each power on or in case of
power failure, set par. P251 (UpDnRefMem) to 1:Yes. Otherwise (0:No setting) the internal reference will
restart from zero.
6. Reference reset. The internal reference value may be set to zero at any time by enabling the digital
input set to 14:UpDnRefReset through one among par. C130 ... C135 (MDIx). In that case, the internal
reference is set to zero with no ramps. If a reset command is simultaneously sent with an increase or
decrease command, the reset command has priority.
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