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Pelco Manual C520M Rev B (6/92) 5
5.0 OPERATION AND SYSTEM TEST
5.1 MANUAL OPERATION TEST
After installing the interconnecting cable between the
pan/tilt and control, plug the control into the AC outlet,
turn control on, and test operation using the following
procedures:
1. Move the joystick to the UP position; the front of
the tilt table should move upwards. Move the joy-
stick to the DOWN position; the front of the tilt
table should move downwards.
2. Move the joystick to the LEFT position; the unit
should pan to the left. With the joystick at the
RIGHT position, the unit should pan to the right.
3. Test operation of the diagonal positions of the joy-
stick (which combine both pan and tilt functions
simultaneously). For example, moving the joystick
diagonally to the left between LEFT and UP should
pan the unit to the left and move the tilt table up.
5.2 AUTO/RANDOM SCAN
OPERATION TEST
The MPTA24DT, MPTA115DT, and MPTA220DT Se-
ries provide two modes of automatic pan operation –
Random Scan and continuous Auto Scan. After install-
ing the interconnecting cable between the pan/tilt and
control, plug control into the AC outlet, turn control
on, and test operation using the following procedures:
5.2.1 Random Scan Operation
1. For Random Scan operation, activate the rocker
switch located on the left side of the control in the
AUTO/RANDOM position. Activation of this
switch causes scanning between limits in an un-
predictable pattern:
a. The scan duration varies randomly between
approximately 0 and 60 seconds.
b. At the completion of a scan period, a dwell
(or rest) period occurs. This dwell period var-
ies randomly between about 4 seconds and an
adjustable 60 to 900 seconds.
The MPTA24DT, MPTA115DT, and
MPTA220DT are factory preset for a duty
cycle of 50%. However, Random Scan dwell
time is adjustable by installation or removal
of diodes CR9, 10 and 11 on PCB1500530.
Table A shows the available duty cycle com-
binations.
c. At the completion of a dwell period, another
scan period is started. The direction of this scan
period is also randomly determined.
d. When a pan limit is reached, scan direction is
reversed automatically.
5.2.2 Continuous Auto Scan
For continuous AUTO/SCAN, activate the rocker
switch in the AUTO/RANDOM position a second time.
After approximately one half hour in Auto Scan, the
unit automatically reverts to Random Scan.
NOTE: Pressing AUTO/RANDOM while in
Random Scan causes a shift to Auto Scan and
starts the half hour timer. Similarly, pressing
AUTO/RANDOM while in Auto Scan causes
a shift to Random Scan and zeros the half hour
timer.
For MPTA24DT, MPTA115DT and MPTA220DT,
manual operation can be activated two ways — by
pressing MANUAL or by moving the joystick while
the unit is in Auto or Random Scan.
Table A. Available Duty Cycle Combinations
Duty Cycle
CR11 CR9 CR10 (Percent)
000 50
001 25
010 17
0 1 1 12.5
100 10
101 8
110 7
1 1 1 6.25
1 = Diode in circuit.
0 = Diode out of circuit