Joyce LA155P (120 VAC) - Manual (Page 4)

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5. The Linear actuators can be mounted and operated in any orientation. Standard Linear
actuators will come with all holes plugged. Follow the procedure in Section 1-9 to properly plug
or vent the holes to prevent dirt and moisture from contaminating the actuator.
6. Never allow the actuator to retract beyond the minimum closed position or extend beyond the
maximum open position, as damage to the unit can occur. Refer to the Travel Limit Chart
provided in Section 4-4 for a list of dimensional limits.
7. External temperature may exceed 200 Degrees F. near maximum duty cycle. Use caution to
prevent personal injury.
8. Do not use actuator in applications where the unit can be jammed; that is, where the limits can
be over-traveled or the linear actuator can be pressed against an immovable object.
9. The capacitor may retain an electrical charge. Touching the terminals may result in an
electrical shock. Exercise caution when handling the capacitor.
1-6 General Installation Instructions
1. Ensure that all personnel who will service or operate equipment are familiar with its use and
limitations.
2. Secure or remove the load before any installation procedures begin.
3. Be certain the rating of the actuator meets or exceeds the load.
4. The actuator must be mounted on a rigid structure sufficient to support the maximum possible
load. An under-designed structure could lead to premature wear or failure.
5. When fastening the load to an actuator, make sure the actuator is in the retracted position.
This positions the load accurately with respect to the lifting screw centerline. Never pull the
translating tube to one side to make connection with your structure. Fully extend the actuator to
make sure the load is aligned with the translating tube.
6. Limit switches are NOT pre-set. They require field adjustment before use (See Section 1-7 and
1-8).
7. The capacitor may retain an electrical charge. Touching the terminals may result in an
electrical shock. Exercise caution when handling the capacitor.
1-7 Limit Switch Adjustment – Initial Adjustment Procedure
1. The travel limits must not be exceeded when setting the limit switches.
This means that you do not want to set the extended or the retracted position beyond the
designed travel limits of the unit.
2. Remove the screws (47), switch cover gasket (62) and switch cover (63). On units equipped
with a potentiometer, remove the nut retainer (59).
3. Rotate both Limit Switch Nut Cams (56) toward the center of the threaded shaft (55) to clear
the switches.
4. Rotate the translating tube (33) until the distance between both clevis eyes equals the
minimum closed dimension you require. This can be fine adjusted via the slot at the end of the
motor. Do not exceed the designed travel limits of the unit. Refer to the Travel Limit Chart
in Section 4-4.
5. If the clevis holes are not properly aligned, use a screwdriver to rotate the motor (3) and drive
the translating tube (33) to its proper retracted position.
6. Now adjust the limit switch nut cam (56) that controls the retracted limit. This switch has a red
electrical lead attached to it. To make this adjustment, rotate both limit switch nut cams
together on the threaded shaft until the switch is activated. You will see the switch lever
depress and hear it “click” when it is activated.
7. If a potentiometer is included on the linear actuator, it will need to be adjusted before
reinserting the nut retainer (59) as described in the next step. Holding the potentiometer so the
small pinion gear (60A) is facing you, gently rotate it clockwise until it reaches the end of travel.
Now rotate the pinion counter-clockwise ½ turn. This protects the potentiometer from being
“jammed” and its travel limits exceeded.
8. Temporarily insert the retainer nut (59) into the proper slots in the limit switch cavity and in the
slots in the cams (56). Using a marking pen, mark the slot on the limit switch nut cam (56) of
the lower limit switch. Do not mark the upper cam (56) at this time. Use screw (47) to install
the limit switch gasket and cover (62, 63) to hold the retainer nut (59) in place.