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RC4000 ACU Boardset
3.3.1.3.7 Elevation Drive Parameters
The CONFIG-EL DRV screen contains configuration items for customizing the characteristics of the motor
drive for the Elevation axis.
FAST VOLTAGE <0-100 % OF MAX>
FAST:
FAST VOLTAGE <0-100 % OF MAX>
SLOW:
SLOW VOLTAGE <0-100 % OF MAX>
The FAST/SLOW setting represents the percentage of maximum voltage that the motor drive will output
to the motor for the elevation axis based upon the current speed (FAST or SLOW). The motor drive of
the RC4000 will supply 24VDC by default. The output voltage is decreased by way of pulse width
modulation.
CL:
CURRENT LIMIT <0-10 AMPSx10, 0=OFF >
The RC4000 motor drive can supply up to 10 Amps. The current limit setting is a value between 0 to 100
and the unit of measure is tenths of an Amp. For example, if the desired current limit for the Elevation
axis is 7.5 Amps, then enter a value of 75 (7.5 x 10 = 75.) Or the desired current limit is 10 Amps, then
enter a value of 100 (10 x 10 = 100.)
ACC:
ACCELERATION <0-999 MSEC>
DEC:
DECELERATION <0-999 MSEC>
The ACC and DEC settings represent the acceleration and deceleration times respectively. This
represents the time it takes (in milliseconds) to ramp from 0 to 24VDC during acceleration or to ramp from
24 to 0VDC in deceleration. If the Fast or Slow motor speeds are less than 24VDC, the ramp time is a
percentage of the maximum based upon the percentage of maximum voltage at the set speed. The ACC
and DEC values should be set before a COAST RANGE is set (refer to section
IR:
IR COMPENSATION <0-100 UNITS, 0=OFF)
The IR setting adjusts the IR Compensation of the motor drive system. The default value of IR
Compensation is 0 and can be adjusted higher as needed. This value adjusts gain in the motor drive that
counteracts the impedance of the system.
JAM :
JAM SLOP <0.0-10.0 DEG, 0.0=OFF>
The elev_jam_slop_item specifies the amount of sensed movement the controller wants to see before
declaring a jam condition. See the Drive System theory
The unit of measure of the entered value is in hundredths of a degree (0.01 deg).
The value should be set to avoid nuisance jams but allow a jam to be declared within a reasonable
amount of time to avoid damage to the system. Too high of a value will trigger false jam conditions since
the mount may sometimes not be able to move that far in the required interval. Too low of a value may
allow mechanical slop in the system to appear as valid movement thus never triggering a jam.
Setting the value to 0.0 will disable the jam sensing since no movement will be required to be sensed to
make the jam system think the mount has moved when it should. This may be a useful thing to do in
emergency situations to alleviate unwanted jam declarations but should only be done temporarily vs.
having an active jam sensing system.
FAST:100
ACC:250
SLOW: 17
DEC:250 JAM: 0.2 FDB: 750
CL:100
IR: 14 RUN: 2.0 SDB: 500
Chapter 3
CONFIG-EL DRV
section
4.3.3.
119
Software
3.3.1.3.5
and 3.3.1.3.6.)
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