Installation
Restraint Arm Installation
Thermo Fisher Scientific
REC 3449 Rev M
2-3
Restraint Arm
Installation
1. Attach restraint arm to speed sensor with two (supplied) 5/16" x
1-1/4" bolts. See 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.
2. Weld or otherwise secure an appropriate mechanical stop such as a
piece of 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.
3. Fit one end of the supplied restraining spring through the hole in the
end of the 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.
4. Although not required, it is recommended that a rock or step shield be
fabricated and installed around the speed sensor.
Alternate Sensor
Location
In installations where the tail pulley or snubbing roll shaft is not
accessible, an 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 speed sensor (at rated belt speed or over the range of belt
speeds that are of concern).
2. Locate the pulley on the clean side of the return belt to minimize
material build up on the pulley.
3. Install the unit in such a manner as to provide 15 to 30 degrees
contact wrap on the pulley. Any slippage between belt and pulley will
decrease the belt scale accuracy.
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.
S
Summary of Contents for 61-12C
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Page 28: ...Installation Electrical Wiring 2 10 REC 3449 Rev M Thermo Fisher Scientific...
Page 32: ...Maintenance Calibration 4 2 REC 3449 Rev M Thermo Fisher Scientific...
Page 42: ...Service Repair and Replacement Parts Parts List 5 10 REC 3449 Rev M Thermo Fisher Scientific...
Page 44: ...Engineering Drawings A 2 REC 3449 Rev M Thermo Fisher Scientific...
Page 46: ...Factory Mutual Report Overview B 2 REC 3449 Rev M Thermo Fisher Scientific...
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