Motor Drive - Honeywell MAXPRO-Net Hardware Installation Manual

7.12.4

Motor Drive

The second micro-controller on the RD379 receives data from the CC-2000
communications chip, and generates the appropriate control waveforms for pan, tilt and
lens motors.
Connections
Connections for pan and tilt motors are made at PL16 and PL15 respectively. The motor
speed is varied using pulse-width modulation. The motor drive and brake outputs are
protected with a current limit of 10A. Should a current spike pass this threshold, the
output drive will switch off until a new output is generated from the motor drive
processor. In addition re-settable fuses are used to protect the output. These become
open circuit after a few seconds if excess current (but less than 10A) is drawn from either
motor drive output. After a few seconds these fuses automatically reset.
The zoom and focus drive is output from PL9. Speed is again controlled using pulse-
width modulation, and this time the output is current limited to 80mA.
Preset Connections
If the pan/tilt motors and lenses used are fitted with position pots, up to 100 preset views
can be programmed into the RD379 site receiver. The board provides a 5V reference
that is output to the pan/tilt pots at PL12, and to the focus/zoom pots at PL14. The
return voltage is then dependant on the position of the associated pot, and is input at
PL11 for pan/tilt and PL13 for focus/zoom. The views are set and recalled from the
system keyboard.
LED Indicators
The motor, brake and lens outputs each have a pair of LED's to indicate when the output
is driving either +ve or –ve. These are listed below.
Rev. C
LED INDICATION
L6 Focus –ve
L7 Focus +ve
L8 Zoom –ve
L9 Zoom +ve
L10 Tilt Up (-ve half cycle)
L11 Tilt Up (+ve half cycle)
L12 Tilt Down (-ve half cycle)
L13 Tilt Down (+ve half cycle)
L14 Pan Right (-ve half cycle)
L15 Pan Right (+ve half cycle)
L16 Pan Left (-ve half cycle)
L17 Pan Left (+ve half cycle)
7.12-5 HMXMU001018
10/06