5
2
Limit Switches & Limit Cams: Adjustment & Functionality
WARNING
To reduce risk of SEVERE INJURY or DEATH to persons:
•
Do not attempt to make limit switch adjustments unless power has been electrically disconnected.
•
The adjustment of the deceleration limit may affect the door's stop position.
2.1
Limit Switch Adjustments: Open and Close Cam Settings
This operator is equipped with the
ACCU-CAM
®
feature, for precise and quick one-handed limit setting adjustments.
To adjust the limit cams, see Figure 2.
1. Pull the cam's retaining bracket back.
2. Turn the cams for limit adjustment: turning cams toward the center of the limit shaft increases door travel or
turning the cams toward the limit switch decreases door travel.
2.2
Limit Switch Functionality
Open Limit Switch
When activated, the Open Limit Switch will stop the operator while the door is travelling in the upward direction.
Should be adjusted accordingly to stop door in fully open position.
Close Limit Switch and Advanced Close Limit Switch
Close Limits are not present on operators with an ECB. In it's place, the microprocessor has a built-in patented
Advanced Close Time feature. While the door is travelling downwards and once the Advanced Close Limit Switch is
activated, the door will stop after
200 milliseconds
. The distance travelled varies according to the speed of the door.
The value is fixed and cannot be re-programmed or adjusted.
Deceleration Limit Switch
The operator is provided with a
V
ariable
F
requency
D
rive. The deceleration time is factory set, however it can be
adjusted on-site using the Deceleration Limit Switches (Open and Close).
For technical support, please call
1-800-361-2260
for more information
Figure 2 - Limit Switches and Cams Adjustment
Advanced Close
Limit Switch
Deceleration
Open Limit Switch
Open Limit
Switch
Deceleration
Close Limit Switch
Increase
Door Travel
Open Cam
Close Cam
Cam Retaining
Bracket
Decrease
Door Travel
Open Side
Close Side
Increase
Door Travel
