Milnor PulseFlow 76028 G3, Installation And Service

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MSSMD446AE/9637AV (1 of 3)
È SETTING ROTATION LIMIT SWITCH POSITIONS
ON 76028 AND 76039 TUNNEL WASHERS
Four limit switches control tunnel cylinder rotation angle and additional switches monitor the rotational align-
ment of adjoining tunnel units. Slotted switch mounting brackets permit adjusting the angular position of each
switch. However, fixed switch locations have been established for the models covered by this instruction and it is
merely necessary to assure that the switches are located at these positions. These models use an inverter with a
controlled deceleration time, which substantially eliminates variations in cylinder coast times due to varing load
sizes and other factors.
ENTANGLE AND SEVER HAZARDS—Contact with moving components nor-
mally isolated by guards, covers, and panels, can entangle and crush your
limbs. These components move automatically. Even with power off, the tunnel
cylinder can rotate by gravity.
☞
Do not service machine unless qualified and authorized.
☞
Lock off and tag out power at the main machine disconnect before servicing.
☞
Immobilize the cylinder (see MSSM0921AE in the reference manual).
NOTE: These switches have the same angular relationship as those on 76032 tunnel models (covered by
MSSMD410AE). All models share the same rotation control circuitry.
Ë When Switch Positions Must be Checked
—Switches are properly positioned at the factory and
should not need to be adjusted in the field unless symptoms indicate an improper rotation angle. Symptoms include
portions of separate loads becoming intermixed in the tunnel and/or a large volume of water splashing out of the
discharge end during transfer. Verify that switches are located in the positions specified herein. If resetting the
switch positions does not correct the problem, contact the factory.
Ë Switch Function and Identification
—On these models, all four rotation-control switches and one align-
ment-monitoring switch are operated by the same target. Each additional alignment switch has its own target. The
clockwise limit switch (RPX1) and counterclockwise limit switch (RPX2) control the angle of rotation of the cylin-
ders during reversals. The transfer limit switch (RPX4) controls the angle of rotation during transfer. The safety limit
switch (RPX3) is a backup to the transfer limit switch. Should the Miltron controller detect any of these switches
operating out of sequence, it will immediately stop tunnel rotation and display an error message.
Additional limit switches (one per tunnel unit) are furnished on these models to ensure all units are turning
synchronously. Two of these switches (RPX5 and RPX6) are installed at the same location (between the same two
units) as the rotational limit switches. One additional switch is installed at every other location where units mate
together. Since the alignment switches function in series, all such switches (and their targets) must be located at the
same angular position so that all inputs are made at the same time. Should the Miltron controller detect a misalign-
ment between units, it will immediately stop tunnel rotation and display an error message.
FIGURE 1, next page, identifies all limit switches.
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