Preventive Maintenance Frequency
Preventive Maintenance Safety Instructions
Maintenance recommendations for each device are intended to maintain the equipment or subassemblies in a satisfactory operational state for their useful service life.
Preventive maintenance schedule is calculated by the Micrologic X control unit from:
oThe operating conditions of the Masterpact MTZ device.
oThe criticality of the user application.
The Micrologic X control unit generates events to inform the user that maintenance needs to be planned to conform to the preventive maintenance schedule.
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UNINTENDED EQUIPMENT OPERATION |
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Follow the recommendations for the maintenance given in the different chapters of this document, for each part of the device which is maintainable. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
If the recommended maintenance plan is not done as required, the service life of electrical distribution equipment is reduced.
The following table summarizes maintenance operations for the three preventive maintenance programs:
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Maintenance program |
Maintenance description |
Performed by |
|---|---|---|
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Basic end-user maintenance |
Visual inspection and functional testing, replacement of inoperative accessories. |
oTrained and qualified end-user personnel oTrained and qualified maintenance services provider personnel oSchneider Electric field service representative |
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Standard end-user maintenance |
Basic end-user maintenance, plus operational servicing and subassembly tests. |
oTrained and qualified maintenance services provider personnel oSchneider Electric field service representative |
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Manufacturer maintenance |
Standard end-user maintenance, plus diagnostics and part replacements by Schneider Electric Services. |
Schneider Electric field service representative |
Favorable Environmental Conditions and Device Operating Conditions
Environmental conditions and device operating conditions are considered to be favorable when all of the following conditions are met:
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Favorable environmental conditions and device operating conditions |
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|---|---|
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Temperature |
Annual average ambient temperature outside the switchboard Ta < 25 °C (77 °F) (IEC 61439-1). Device installed in an air-conditioned room or in a ventilated switchboard. |
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Percent load |
< 50 % of In (daily process 8/24 h or continuous process 24/24 h) |
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Relative humidity |
< 50 % |
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Corrosive atmosphere |
Device installed in category 3C1 environment or in a closed room that creates favorable operating conditions (air is conditioned and purified). |
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Salt environment |
None |
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Dust |
Negligible. Device installed in a switchboard equipped with filters or a ventilated IP54 enclosure. |
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Vibration |
None |
Normal Environmental Conditions and Device Operating Conditions
Environmental conditions and device operating conditions are considered to be normal when all of the following conditions are met:
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Normal environmental conditions and device operating conditions |
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Temperature |
Annual average ambient temperature outside the switchboard Ta < 25 °C (77 °F) (IEC 61439-1) |
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Percent load |
< 80 % of In (daily process 8/24 h or continuous process 24/24 h) |
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Harmonics |
Harmonic current per phase < 30 % of In |
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Relative humidity |
< 70 % |
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Corrosive atmosphere |
Device installed in environment category 3C2 or 3C3 (IEC 60721-3-3) |
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Salt environment |
No salt mist |
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Dust |
Low level. Device installed in a switchboard equipped with filters or a ventilated IP54 enclosure. |
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Vibration |
Permanent vibration < 0.2 g |
Severe Environmental Conditions and Device Operating Conditions
Environmental conditions and device operating conditions are considered to be severe if any of the following conditions are present:
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Severe environmental conditions and device operating conditions |
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|---|---|
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Temperature |
Annual average ambient temperature outside the switchboard Ta between 35 °C (95 °F) and 45 °C (113 °F) (IEC 61439-1) |
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Percent load |
> 80 % of In (daily process 8/24 h or continuous process 24/24 h) |
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Relative humidity |
> 80 % |
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Corrosive atmosphere |
Device installed in category 3C4 environment without any particular protection |
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Salt environment |
Device installed less than 10 kilometers from the coast without any particular protection |
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Dust |
High level. Device not installed inside an enclosure equipped with filters or a ventilated IP54 enclosure. |
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Vibration |
Continuous vibrations between 0.2 g and 0.5 g |
For example, severe environmental conditions and device operating conditions prevail in marine and wind power applications.
Criticality of User Application
The following table describes the three criticality levels of user application.
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Criticality level |
Description |
|---|---|
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Low |
The loss of function will cause minimal curtailment of operations or may require minimal monetary investment to restore full operations. Normal contingency planning would cover the loss. |
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Moderate |
The loss of function will have noticeable impact on the facility. It may have to suspend some operations briefly. Some monetary investments may be necessary to restore full operations. It may cause minor personal injury. |
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High |
The loss of function will cause personal injury or substantial economic damage. Loss would not be disastrous, but the facility would have to suspend at least part of its operations immediately and temporarily. Reopening the facility would require significant monetary investments. |
Recommended Frequency for the Basic End-User Maintenance Program
The following table indicates the recommended frequency to perform the Basic end-user maintenance program according to operating conditions and criticality of the user application.
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Operating conditions |
Criticality of user application |
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|---|---|---|---|
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Low |
Moderate |
High |
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Favorable |
2 years |
2 years |
2 years |
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Normal |
1 year |
1 year |
1 year |
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Severe |
1 year |
1 year |
1 year |
Recommended Frequency for the Standard End-User Maintenance Program
The following table indicates the recommended frequency to perform the Standard end-user maintenance program according to operating conditions and criticality of the user application.
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Operating conditions |
Criticality of user application |
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|---|---|---|---|
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Low |
Moderate |
High |
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Favorable |
4 years |
4 years |
4 years |
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Normal |
2 years |
2 years |
2 years |
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Severe |
2 years |
2 years |
2 years |
Recommended Frequency for the Manufacturer End-User Maintenance Program
The following table indicates the recommended frequency to perform the manufacturer end-user maintenance program according to operating conditions and criticality of the user application.
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Operating conditions |
Criticality of user application |
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|---|---|---|---|
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Low |
Moderate |
High |
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Favorable |
6 years |
5 years |
4 years |
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Normal |
5 years |
4 years |
3 years |
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Severe |
4 years |
3 years |
2 years |
A complete check-up is recommended when tripping occurs due to a short-time or instantaneous short-circuit.
