RC4500 Antenna Controller Chapter 5 MODES – In Depth Descriptions
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The CONFIG-AZ DRV screen contains configuration items for customizing the characteristics of the motor
drive for the Azimuth axis.
5.2.1.3.4 Azimuth Drive Parameters
FAST:100 ACC:250 CONFIG-AZ DRV
SLOW: 50 DEC:250 JAM: 4 FDB:1000
CL:100 IR: 0 RUN: 200 SDB: 500
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 azimuth axis based upon the current speed (FAST or SLOW). The motor drive of the
RC4500 will supply 24VDC by default. The output voltage is decreased by way of pulse width modulation.
CL: CURRENT LIMIT <0-10 AMPS*10, 0=OFF >
The CL setting represents the percentage of maximum current that the motor drive will allow to the motor
for the azimuth axis. The motor drive of the RC4500 will supply up to 10 Amps by default.
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 5.2.1.3.2.)
IR: IR COMPENSATION <0-100, 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 azim_jam_slop_item specifies the amount of sensed movement the controller wants to see before
declaring a jam condition. See the Drive System theory
section 6.2.3.
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 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.
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