Inspection During Operation; Repair; Lubricants; Lubricant Changes - Danfoss VLT OneGearDrive Instruction Manual

Service and Maintenance

4.2 Inspection during Operation

Changes in relation to normal operation, such as higher
temperatures, vibrations, noises, etc. tend to indicate that
the function is impaired. To avoid faults which could lead
directly or indirectly to injury to persons or damage to
property, inform the maintenance staff responsible. If in
any doubt, switch the geared motors off immediately.
Carry out regular inspections during operation. Check the
®
VLT OneGearDrive at regular intervals for anything
unusual.
Pay particular attention to:
•
Unusual noises
•
Overheated surfaces (temperatures up to 158° F
[70° C] may occur in normal operation)
•
Uneven running
•
Strong vibrations
•
Loose fastenings
•
Condition of electrical wiring and cables
•
Poor heat dispersion
In the event of irregularities or problems, contact Danfoss
Service.

4.3 Repair

NOTICE!
®
Always return defective VLT
Danfoss Sales Company.

4.4 Lubricants

4.4.1 Lubricant Changes

The gear units are supplied with lubricant ready for
operation.
Table 4.4 shows the oil change intervals based on normal
operating conditions and a lubricant temperature of
approximately 176° F [80 °C]. The lubrication interval must
be reduced at higher temperatures (halve it for each 10 K
increase in the lubricant temperature).
®
VLT OneGearDrive Instruction Manual
OneGearDrives to the local
®
MG75C322 - VLT is a registered Danfoss trademark
Lubricant type
PGLP220
Optileb GT220 H1 (food grade)
Table 4.4 Lubricant Change Intervals
The gear units have filling plugs and drain plugs. In the
standard designs, these make it possible to change the
lubricant without disassembly.
It is also necessary to flush the gear unit enclosure if the
lubricant grade or lubricant type is changed.
If the motor is only used briefly, it is sufficient to drain off
the original oil and use the original lubricant type to refill
the maximum possible amount for the gear unit as defined
on the nameplate. Then operate the drive unit briefly
under no load, drain this oil off again and refill with the
new lubricant as defined on the nameplate.
If necessary, drain off the original lubricant and flush out
the gear unit with petroleum until all traces have been
washed out. Then perform the procedure described for
short-term operation twice before filling with the specified
volume of new lubricant in accordance with the
nameplate.
Inspect, and if necessary replace, the wear parts (seals)
when changing the lubricant.

4.4.2 Lubricant Grade

Oils PGLP 220 and PGLP 68 comply with DIN 51502 and
DIN 51517 and are suitable for lubricating the gear unit.
Food grade oils which comply with NSF H1 can be used.
The lubricant must permit low-friction, virtually wear-free
continuous operation. The damage load level on the FZG
test as specified in DIN 51354 should be in excess of load
level 12, and the specific wear below 0.27 mg/kWh. The
lubricant should not foam, should protect against
corrosion, and should not attack the interior paint, the
rolling contact bearings, gearwheels, and seals.
Lubricants of different types may not be mixed, as this
may impair the lubrication characteristics. A long service
life is only ensured by the use of a lubricant listed in
Table 4.5 or equivalent.
Lubricant change interval
25,000 operating hours
35,000 operating hours
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