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Section 6
Maintenance
Preventive Maintenance
The service life of the eddy-current clutch largely depends
on routine maintenance received during its lifetime. Lax
maintenance increases the probability of sudden,
catastrophic failures, which are costly to repair and
interrupt production schedules. Routine preventive
maintenance is the best assurance of long uptime. The
purpose of this maintenance section is to help you set up
a good maintenance program. Many factors affect the
service life of any machine. This manual cannot cover all
contingencies, but it will assist experienced maintenance
personnel in maintaining the unit. Refer any questions to
the Field Service Department in Sturtevant, Wisconsin.
Check List
A checklist provides a record of work completed and
serves as a necessary reference for all areas to be
checked. Each installation requires a unique checklist that
includes all the equipment involved. The maintenance
supervisor should prepare this checklist and include all
maintenance checkpoints for that equipment, the
frequency each item should be checked and the specific
parameters that should be observed. Table 6-1 suggests
items that may be included; each is followed by its specific
parameters.
Inspection
During routine maintenance, perform visual checks for
loose bolts, missing guards, lubricant leaks, excessive dirt
on cooling surfaces and air inlets and any other abnormal
condition. Question the operator to determine if any
abnormal condition exists or if a change in operation has
been noted. Compare the overall
performance with previous reports. Investigate any
changes noted. Specifically, check any brake or other
support devices that are used.
Cleaning
Cleaning should be performed as often as dictated by the
environment of the unit. The more severe (dirty or hot) the
conditions are, the more often these tasks must be
performed. Before doing any work, turn AC power OFF,
and lock out disconnect switch.
Clean accumulated dust and dirt from the unit and
immediate area. Pay special attention to air intake areas
under end bracket. Dirt allowed to accumulate there can
easily obstruct airflow or be drawn into the unit to cause
overheating or mechanical binding.
If unit has a friction brake attached to it, particles will rub
off the friction surfaces and collect inside brake cover.
Remove cover and clean the brake. Check brake
operation to determine if it operates freely. Check to see
if parts are worn and need replacing.
If dirt and other contaminants are drawn into the unit with
the cooling air, the unit may eventually require internal
cleaning. Since internal cleaning requires disassembly,
the work should be performed by a qualified service shop.
Refer to the paragraphs under the headings "Repair
Service” and “Repair Instruction” in Section 7 of this
manual.
Maintenance Check List
Table 6-1
Items to be Included
Description
1.
Nameplate Data
Complete nameplate data for reference.
2.
List of Drawings
Complete lists of applicable drawings and where located.
3.
Operating Speed Range Minimum and maximum speed normal to machine.
4.
Load Range
Minimum and maximum motor current normal to machine or to product.
5.
Electric Service
Voltage and current.
6.
Coil Ratings
Voltage and current for the clutch and brake coils (when used).
7.
Lubrication
Type grease, frequency and amount to be used.
8.
Safety Devices
Type and setting of each.
9.
Alignment Data
Angular and offset maximum limits.
10. Vibration
Normal readings, where taken and frequency of checking.
11. Service Record
Date and initials of person making periodic check. Space for comments should be
provided.
12. Repair Record
Date and description of problem and items repaired or replaced.