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Checking
The smooth running characteristics and machine running noise have not
deteriorated
The motor foundation has no cracks and indentations (*)
The machine is aligned within the permissible tolerance ranges
All the fixing bolts/screws for the mechanical and electrical connections have
been securely tightened
All the potential connections, grounding connections and shield supports are
correctly seated and properly bonded
The winding insulation resistances are sufficiently high
Any bearing insulation is fitted as shown on the plates and labels
The CABLES and insulating parts and components are in good condition
and there is no evidence of discoloring
(*) You can perform these checks while the motor is at standstill or, if required, while running.
NOTICE
Machine damage
When carrying out the inspection, if you detect any impermissible deviations from the normal
state, you must rectify them immediately. They may otherwise cause damage to the machine.
9.1.4
Servicing the roller bearings
When inspecting rolling-contact bearings, it is generally not necessary to dismantle the
machines. The motor only has to be dismantled if the bearings are to be replaced.
9.1.5
Bolt grade
Check that all the bolts for attaching the bearing shields, bearing cover, gland plates, and
terminal boxes are present and properly tightened. Replace damaged bolts with identical bolts
of a perfect quality.
Depending on the ambient temperature, only bolts with the bolt grade according to the following
table are permissible for motors without heating.
Table 9-3
Bolt grade BG071 to BG315
Type/size
071, 080, 090, 100, 112, 132,
160, 180, 200, 225, 250, 280, 315
180.B
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
Bolt grade for ambient temperature T
≥ -40 °C
Standard
Stainless steel bolts
8.8
8.8
9.1 Inspection and maintenance
When the
motor is
running
X
X
u
-55 °C ≤ T
< -40 °C
u
Standard
A4-70
A4-80
Maintenance
At
standstill
X
X
X
X
X
X
X
A4-70
A4-80
85
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