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2.2
Restraint Arm Installation
1. Attach restraint arm to speed sensor with two (supplied) 5/16" x 1-1/4" bolts. See
2. Weld or otherwise secure an appropriate mechanical stop such as a piece of
3. Fit one end of the supplied restraining spring through the hole in the end of the
4. Although not required, it is recommended that a rock or step shield be fabricated
5. Do not connect power to the machine or turn on the unit until you have read and
NOTE
The purpose of this mounting arrangement is to allow the speed sensor to "float" and
accommodate any slight misalignment of the coupling. Therefore, no resultant
bearing stress is applied due to misalignment, nor will a slight "wobble" of the device
result in electrical errors.
2.3
Alternate Sensor Location
In installations where the tail pulley or snubbing roll shaft is not accessible and
additional pulley must be installed specifically for the speed sensor. When using an
additional pulley for the speed sensor, the following requirements are essential:
1. Select the proper pulley diameter to provide a shaft RPM within the range of the
2. Locate the pulley on the clean side of the return belt to minimize material build up
3. Install the unit in such a manner as to provide 15 to 30 degrees contact wrap on
Unless the installation is consistent with the
illustrations shown in Figure 2-1, Figure 2-2,
Figure 2-3, and as described above, the
warranty on the device is void
REC 3016 Rev M
Figure 2-3. The restraint arm should be mounted in a direction that will allow the
sensor restraint arm to twist against the mechanical stop and in the direction of
belt travel.
scrap iron (or a bolt) to the conveyor frame. Rotate restraint arm to let it rest on
the stop. See Figure 2-3. Make the mechanical stop large enough to
accommodate some lateral movement of the restraint arm.
restraint arm. Attach the other end to the conveyor frame. Location should be
such as to give a 1/2 inch spring stretch. Do not over-tighten spring as this may
cause premature failure. See Figure 2-3.
and installed around the speed sensor.
understood this entire chapter. The precautions and procedures presented in this
chapter must be followed carefully to prevent equipment damage and protect the
operator from possible injury.
speed sensor (at rated belt speed or over the range of belt speeds that are of
concern).
on the pulley.
the pulley. Any slippage between belt and pulley will decrease the belt scale
accuracy.
CAUTION
5
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