User Guide

Jackshaft Installation

(MS40-7043 Series)

The MS40-7043 actuator is designed for use with jackshafts up to 3/4" (19 mm) in diameter.

In most applications, the MS40-7043 actuator may be mounted in the same manner as a

standard damper shaft application. If the jackshaft diameter is larger than 5/8" (16 mm) in

diameter, the optional AM-710 universal clamp must be used.

(MS4X-7153 and MS4X-7073 Series)

The MS4X-7153 and MS4X-7073 actuators are designed for use with jackshafts up to 1.05"

(27 mm) in diameter. In most applications, the actuator may be mounted in the same manner

as a standard damper shaft application. If the jackshaft diameter is larger than 3/4" (19 mm)

in diameter, the optional AM-687 universal clamp must be used.

Multiple Actuator Mounting (MS4X-7153 only)

If more torque is required than one actuator can provide, a second actuator may be mounted

to the jackshaft or standard damper shaft, using the AM-673 multiple mounting bracket. See

Figure-4.

Caution:

MX41-707X, 715X - Do not attempt to use the manual override with actuators

mounted in tandem. Damage to the gear train may occur.

Multiple actuators may be powered from one transformer provided the following rules are

followed:

• The total current draw of the actuators (VA rating) is less than, or equal to, the rating of

the transformer.

• Polarity on the secondary of the transformer is strictly followed.

– All Black wires from all actuators are connected to the common lead on the

transformer.

– All Red wires from all actuators are connected to the hot lead.

Caution:

Mixing the Black and Red wires on one lead of the transformer may result in

erratic operation or failure of the actuator and/or controls.

Multiple actuators positioned by the same control signal may be powered from multiple

transformers provided the following rules are followed:

• The transformers are properly sized.

• All Black wires from all actuators are tied together and tied to the negative lead of the

control signal.

SIEBE

MA-7501-502

AM-673

Figure-4 Mounting Multiple Actuators.