tachometer shaft. The Adapter Shaft Assembly (49) is threaded into the base of the
Explosion-Proof Tachometer Housing (54), and its shaft connects to the Gear-reducer’s High
Speed Extension Shaft (48) with a Jaw Coupling (50). This jaw coupling is enclosed in a steel
Housing (51) which connects the Explosion-Proof Tachometer Housing (54) to the Gear-reducer
(2).
To remove the Tachometer (45), first remove the threaded Tachometer Housing Cover (55) of the
Explosion-Proof Tachometer Housing (54) and then, unbolt the Tachometer Mounting Plate (46),
onto which the Tachometer (45) attaches, by removing the screws which hold the Mounting Plate
(46) onto its four Mounting Studs (52). The Spring Coupling (47) will simply slide off either the
tachometer shaft or the High Speed Adapter Shaft (53). The Tachometer (45) is secured onto
Mounting Plate (46) with several small screws.
To reassemble, reverse the preceding procedure.
During reassembly, be certain to properly
align the flats on both ends of the Spring Coupling (47) onto the flats of each shaft to which it
attaches. Tachometer wiring information is included within the instruction manual for the specific
model SCR/DC controller being utilized.
Magnetic Tachometer
Please refer to Figure 7.
4.9.4
When an Acrison feeder is equipped with a variable speed DC drive which includes a Magnetic
Tachometer (110), the tachometer assembly installs between the Gear-reducer (2) and its drive
Motor (1).
The Magnetic Tachometer (110) consists of a machined aluminum ring with a sensor, an integral
conduit box and a sensing gear. For 56C frame motors, a disc spacer is required.
To assemble onto a 56C frame motor,
simply slide the disc spacer onto the Motor (1) shaft,
followed by the sensing gear. (
Note:
The center hub of the gear should face away from the
motor.) The sensing gear includes a keyway to slide over the key on the Motor (1) shaft. The gear
should be positioned to achieve a 0.225" gap from the motor mounting face (see Figure 7).
Tighten the self-locking set screws on the hub of the gear, securing it in position over the shaft
key. Spin the Motor (1) shaft to ensure that the sensing gear does not rub against the spacer or
the aluminum ring. The Motor (1) and Tachometer Assembly (110) can now be attached to the
input flange of the Gear-reducer (2) and secured with the four bolts.
To disassemble,
simply reverse the above referenced procedure.
NOTE 1:
Please note that the center of the gear must be in-line with the center of the sensor,
which is located in the aluminum ring, and that the clearance between the teeth of the
gear and the sensor should be 0.007 to 0.010 inches. If these parameters are not
correct, adjust accordingly. Improper line-up and/or sensor adjustment will cause
tachometer malfunction. On later models, this sensor has been factory aligned,
positioned and permanently secured to the aluminum ring; no adjustment is required or
possible.
NOTE 2:
An explosion-proof Magnetic Tachometer (110) is mechanically identical to the standard
dust-tight/water-tight Magnetic Tachometer (110). Electrically, however, its power supply
and all applicable electrical components are provided in an enclosure suitable for the
explosion-proof area classification(s).
19
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