WEG W22Xdb - Page 56

56 | Flameproof motors
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Table 9-1 - Maintenance plan
DAILY
Completely motor.
- Check the noise.
Bearings.
- Check noise and vibration.
WEEKLY
Bearings.
- Regrease: follow regreasing intervals based on lubrication
instructions.
Coupling.
- After a week: check alignment and fixation and eventually refasten.
Monitoring devices.
- Record measured figures.
ANNUALLY (Complete revision)
Complete motor
- Refasten bolts
Stator and rotor winding
- Visual inspection; Measure insulation resistance.
Terminal box, grounding
- Clean inside of terminal box;
- Refasten bolts.
Coupling
- Check alignment and refasten bolts
EVERY 2 YEARS (Inspection for Ex”d” and Ex”t” motors, according to the standard
IEC 60079-17)
Grade of inspection D = Detailed, C = Close, V = Visual
Ex “d”
Ex “t”
Check that:
Grade of inspection
D
C
V
D
C
V
A
EQUIPMENT
1
Equipment is appropriate to the EPL/Zone requirements of the location
x
x
x
x
x
x
2
Equipment group is correct
x
x
x
x
3
Equipment temperature class is correct (only for gas)
x
x
4
Equipment maximum surface temperature is correct (only for dust)
x
x
5
Degree of protection (IP grade) of equipment is appropriate for the level of protection/group
x
x
x
x
x
x
6
Equipment circuit identification is correct
x
x
7
Equipment circuit identification is available
x
x
x
x
x
x
8
Enclosure, glass parts and glass-to-metal sealing gaskets and/or compounds are satisfactory
x
x
x
x
x
x
9
There is no damage or unauthorized modifications
x
x
10
There is no evidence of unauthorized modifications
x
x
x
x
11
Bolts, cable entry devices (direct and indirect) and blanking elements are of the correct type and are
complete and tight
- Physical check
x
x
x
x
- Visual check
x
x
12
Threaded covers on enclosures are of the correct type, are tight and secured
- Physical check
x
X
- Visual check
x
13
Joint surfaces are clean and undamaged and gaskets, if any, are satisfactory and positioned correctly
x
14
Condition of enclosure gaskets is satisfactory
x
x
15
There is no evidence of ingress of water or dust in the enclosures in accordance with the IP rating
x
x
16
Dimensions of flanged joint gaps are:
- within the limits in accordance with manufacturer’s documentation or
- within maximum values permitted by relevant construction standard at time of installation or
- Within maximum values permitted by site documentation
x
17
Electrical connections are tight
x
18
Breathing and draining devices are satisfactory
x
x
19
Motor fans have sufficient clearance to enclosure and/or covers, cooling systems are undamaged,
motor foundations have no indentations or cracks.
x
x
x
x
x
x
20
The ventilation air flow is not impeded
x
x
x
x
x
x
21
Insulation resistance (IR) of the motor winding is satisfatory
x
x
B
INSTALLATION
1
Type of cable is appropriate
x
x
2
There is no obvious damage to cables
x
x
x
x
x
x
3
Sealing of trunking, ducts, pipes and/or conduits is satisfactory
x
x
x
x
x
x
4
Stopping boxes and cable boxes are correctly filled
x
5
Integrity of conduit system and interface with mixed system is maintained
x
x
6
Earthing connections including any supplementary earthing bonding connections are satisfactory (for
example connections are tight and conductors are of sufficient cross-section)
- Physical check
x
x
- Visual check
x
x
x
x
7
Fault loop impedance (TN systems) or earthing resistance (IT systems) is satisfactory
x
x
8
Insulation resistance is satisfatory
9
Automatic electrical protective devices are set correctly (auto-reset not possible)
x
x
10
Automatic electrical protective devices operate within permitted limits
x
x
11
Specific conditions of use (if applicable) are complied with
x
x
12
Cables not in use are correctly terminated
x
x
13
Obstructions adjacent to flameproof flanged joints are in accordance with IEC 60079-14
x
x
x
14
Variable voltage/frequency installation in accordance with documentation
x
x
x
x