Command Pro Engineered Systems
User Manual
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Figure 12: 21R22CR Antenna Pattern
For normal operation, place the antenna as close to the center of the bridge as practical so that the radio
control operation is symmetrical about the crane. Mount the antenna underneath the crane with a clear line
of sight to the area the crane operator uses. Position the antenna parallel to the ground and have the arrow
on its back side pointing toward either end of the bridge.
Use low loss cables to connect the antenna to the receiver if the cable run is in excess of 18 feet. Use Laird
P/N 600038-01 (9 ft), 600038-02 (18 ft), or 600048- (length in 25 ft. increments) for up to 100 feet of antenna
extension cable.
6.6.3
21R22CR Installation Testing
Perform the tests described in 21R22 Installation Testing on page 23. When these tests have been
successfully performed, proceed with the Control Range Alignment and Test.
6.6.4
21R22CR Control Range Alignment and Test
The Control Range circuit has two adjustments. The Range adjustment determines the maximum operating
distance from the receiving antenna at which the operator can control critical crane functions (refer to the
Control Range circuit board in
Figure 13
).
The Time Delay adjustment determines the length of time the signal must be below threshold before the
Control Range circuit activates. The time delay prevents the Control Range from causing motion jerkiness as
the signal varies due to normal operator load movement.
For ease of alignment, adjust the time delay to the minimum (CCW position) while adjusting the range.
Position the operator with an operating transmitter at the desired range limit.
Turn the Range adjustment until the Range indicator LED illuminates. Slowly rotate the Range adjustment
clockwise until the Range indicator extinguishes. Note that a voltmeter may be connected to the test points
to monitor the voltage for the set point.
Test the operation of the Control Range by having the operator with the transmitter move in and out of
range in all directions and readjust the Range adjustment as needed to achieve the desired range limit. Note
that the time delay holds the Range LED off for about 1.5 seconds after the operator goes out of range.
When the range is properly adjusted, increase the time delay to the desired value. The adjustment may be
set from 1.5 to 10 seconds. Laird recommends a longer time delay to prevent the system from falsely
activating due to the normal dynamics of the operator running the crane.
