SOW_NCAH_MSC_UPS_71816.docx

AG-32SC-S-16-0040 07/18/2016

National Centers for Animal Health 1920 Dayton Avenue Ames, IA 50010

General Information

NCAH Equipment List Uninterruptible Power Supplies

Technical Specification Preventive Maintenance Procedures Uninterruptible Power Supplies & VRLA Batteries

Visual Inspection

· Check area for any safety concerns that may affect the safety of the technician and or NCAH personnel.

· Check subassemblies, wiring harnesses, contacts, cables and other major components for burns or broken wires.

· Clean or replace all air filters.

· Check all fans for slow start and free rotation.

· Check AC input and output for proper wiring, grounding and verify to NEC code standards.

· Check input and output grounding is proper and sufficient for NCAH application.

· Check and record alarm logs.

· Check all circuit boards and connections for cleanliness and or possible problems.

· Check all breakers, power connections, fuses and controls for excessive heating or swelling via thermal scan and reading.

· Check AC and DC capacitors for swelling or leakage.

· Check for DC capacitor vent caps that have extruded more than 1/8”.

· Check all nuts, bolts, screws and connectors for tightness and heat discoloration.

Power Checks

· Check input voltage, amperage, and frequency readings for proper levels and balance. Also check power quality and harmonic distortion levels.

· Check output voltage, amperage, and frequency readings for proper levels and balance. Also check power quality and harmonic distortion levels.

· Check bypass voltage and frequency for proper available power.

· Check input power and harmonic filters for proper operation and balance.

· Check output power and harmonic filters for proper operation and balance.

· With NCAH approval, perform operational test of the system including unit transfer and battery discharge.

· Review system performance with NCAH to address any questions and to schedule any repairs, depending on availability of NCAH.

Internal Component Checks

· Check and calibrate any logic and control signals as specified in the manufacturer’s maintenance procedures.

· Check all indicators and meters for proper operation and calibration adjusting as necessary in accordance to the manufacturer’s maintenance procedures.

· Check and calibrate all power supply settings in accordance with manufacturer's specified settings.

· Check rectifier voltage and current balance for proper operation.

· Check inverter voltages and balance for proper operation.

· Check static switch voltages and inspect for any leakage.

· Check fuses on the DC capacitor deck for continuity, if applicable.

· Install or perform Engineering Field Change Notices (FCN), as necessary.

External Environmental Checks

· Check ambient temperature of the UPS room.

· Check location for cleanliness and accessibility.

VRLA Battery System Checks

· Inspect the appearance and cleanliness of all batteries, connectors, cabinet(s) or rack(s), and room(s).

· Check each battery for signs of damage to the case, cover or terminals, staining of the case, terminals or surrounding areas, excessive swelling, evidence of melting or thermal damage to the cover and terminal post-seal plus support cabinet(s) or rack(s) for signs of physical damage, corrosion, etc.

· Confirm battery cabinet(s) or rack(s) hardware integrity and tighten connections, as necessary.

· Clean and retighten all terminal connectors and check for NO-OX grease or oil on all connections (when needed and/or accessible).

· Check system float voltage and current and adjust if necessary to manufacturer’s specified settings.

· Measure and record DC bus ripple voltage when applicable.

· Measure and record all internal impedance readings.

· Measure and record all battery connection resistances in micro-ohms, when applicable.

· Measure individual battery temperatures and check for any hot spots or readings which are out of the manufacturer’s recommended temperature variance, when accessible.

· Perform individual battery load testing, when accessible.

· Record battery date codes, number of cells and strings.

Reporting Requirements

· Provide a comprehensive report for each uninterruptible power system covering the tasks performed in the above procedures.

· Provide a summary of all non-completed tasks with explanation of reason for non-completion and recommendation to correct condition.

· Provide a summary of maintenance and/or repair recommendation items which need to be completed prior to the next annual inspection.

Ammendment #001