Nidec LEROY-SOMER FFB Series, Руководство по обслуживанию

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en
CORRECTIVE MAINTENANCE
FFB Brake Motors Maintenance Guide
5287 en - 2019.07 / d
4.4 - Air gap adjustment
The air gap requires adjusting when it reaches 0.9 mm..
Lining wear must be checked when the air gap is adjusted, by
checking the disc thickness (R). The dimension R must never
be below the following values, as this would result in damage
including total loss of braking torque, without any warning
signs.
Disc thickness must be measured with an accuracy of at least
0.5 mm.
Always change the disc when the R dimension
reaches the following values:
Brake size Minimum R dimension
FFB1, FFB2, FFB3 10 mm
FFB4, FFB5 16,5 mm
Exceeding R dimension can cause security
problems (quick decrease of braking torque M
f
).
Procedure:
- Unscrew the screws 27 holding the metal cover 13 .
- Remove the metal cover 13 .
- Clear the O-ring
1107
to gain access to the air gap.
- Check the air gap between the yoke 1105 and armature
1102 in 3 points at 120°.
- Release spacers 1104 , move them closer to the yoke 1105 .
- Screw (to narrow the air gap) or unscrew (to increase
the air gap) the screws 1106 while measuring the air gap
between the yoke and the armature to obtain a dimension
as specified in the table below:
Release option
Brake size
Without
option
with DLRA
lever (§6.1)
with DLM or
DMD Lever
(§6.2, 6.3)
FFB1, FFB2, FFB3 0,3 - 0,4 mm
0,6 - 0,7 mm
FFB4, FFB5 0,4 - 0,5 mm
- Screw the spacers 1104 in abutment on friction face-plate
(tighten to 2 Nm ±10% torque).
- Tighten fixing screws 1106 brake yoke on face-plate to the
torque as follows:
Brake size
FFB1 4,9 Nm ± 10%.
FFB2, FFB3 8,5 Nm ± 10%.
FFB4, FFB5 21 Nm ± 10%.
- Check the value of the air-gap again.
- Reposition the O-ring
1107
into its groove.
- Fasten the cover 13 with its screws 27 .
- Position the cover closing hatch 1406 by ensuring that the
lever travel (in the brake release position) is effective.
When DLRA or DLM mounted, refer to §6.1, 6.2.
After 3 air gap adjustments, always check the
value of the R dimension frequently and
changing the brake disc item 1101 is
recommended (according to dynamic brake use).
Atex zone 22
Refere to Specific recommendations for commissioning and
maintenance ref.3711.
If the brake is not equipped with an opening/closing detector,
check the clearance periodically according to the rates and
the energy to be dissipated on each braking operation (see
technical catalogue ref 5329 § Brake energy capacity).
4.5 - Maintenance
Control after commissioning (about 50h).
Check tightening of fastening screws and belt tensioning if
applicable.
Preventive maintenance visit.
- Check regularly that the recommendations concerning
mechanical and electrical installation are still complied with.
- Inspect the seals.
- Remove any dust or foreign bodies which might clog the
cover grille and the housing fins.
- Lubricate the bearings of the motors fitted with grease
nipples.
In the absence of a wear detector (highly recommended for
lifting - UL applications):
- Beyond the 3rd air gap measurement, the user must check
disc thickness at sufficient interval (according to the braking
cycle and energy to dissipate to avoid exceeding the R
dimension see § Operation in the technical catalogue ref.
5329) .
In the absence of opening/close detector (highly
recommended for applications in Atex zone):
- The user will check the air gap at a sufficient interval
(according to the braking cycle and energy to dissipate, for
information refer to § Operation in the technical catalogue
ref 5329) to prevent disc locking (risk of overheating and
early lining wear).
- Gaskets, bearings:
1 an
Inspect the condition of the gaskets and bearings at the shaft
passage (item. 39, 54, 1402).
Garnitures
R
Rep. 1101