PREVENTIVE MAINTENANCE WORK LIST

The control list can be optimized according to specific equipment condition and customer’s requests

Visual control of physical state of the equipment and battery

Thermographic survey on equipment and battery

Fans, capacitors and batteries working over the expecting time life check

Condition of electrolytic (DC) and AC capacitors check

Equipment and battery rooms fans control

Correct partial outgoing current check on rectifier bridge. Ripple on battery measure.

Battery charge cycle check

Control of the electrical parameters: rectifier and emergency mains input voltage, rectifier bridge partialisation, battery charging voltage level, DC bus bar insulating level to earth, output inverter voltage, inverter current, inverter to mains phase displacement, output neutral to earth voltage, output inverter capacitors filter current, electrical and thermal working point. Data record on specific TABLE

Battery discharge and recharge, cells equalization check, internal resistance and thermographic reliefs. Data record on specific TABLE.

Commutation test: switching inverter→ emergency mains→ inverter. On DC systems rectifier1→ rectifier2

In manual by-pass: to check the maximum-minimum inverter output voltage thresholds

In manual by-pass: emergency mains switch off, inverter frequency working by oscillator control. Return on mains synchronization

In manual by-pass: check of remote and on board alarms

In manual by-pass (complete UPS disconnection): old and defective parts substitution

In manual by-pass (complete UPS disconnection): check and tighten of all terminal connections

In manual by-pass (complete UPS disconnection): cleaning of all parts and contacts with specific deoxidant

Spare part stock control. Stock optimization proposals

Recommendations, proposals and system modification advises

Final test report compilation

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