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Failure to connect the unit to a suitable grounding electrode creates an electrical shock hazard. An electrical shock will result in serious personal injury or death. |
High voltage levels are present within the UPS. The UPS should be opened only by service personnel that are qualified. The UPS must have a proper ground connection to earth.
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High voltage may be present. Work on this equipment must be performed by authorized trained personnel. Failure to disconnect the power source before performing maintenance or removing modules exposes personnel to electrical potential. Bodily contact with electrical potential will cause serious personal injury or death. |
After power is removed, wait for 5 minutes before the UPS is opened. This action allows the capacitors to discharge. Ensure that the capacitors are at a zero energy level before performing work.
Personal protective equipment (PPE) suitable to the work being performed must be worn when performing maintenance on the UPS.
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High voltage is present. Work on this equipment must be performed by authorized trained personnel. Personnel must be wearing Personal Protective Equipment that meets regulatory requirements to protect the body for the work that is being performed. Failure to use appropriate PPE to protect the body will result in serious personal injury or death. |
Inspecting the Interior of the UPS
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Performing maintenance inspections with power supplied to the UPS may result in serious personal injury or death. When using an external maintenance bypass, the UPS can be fully de-energized. When using an internal maintenance bypass, the UPS is not fully de-energized. Refer to the Building System Schematic to ensure that all necessary precautions have been taken before performing any maintenance procedure. Use lock out and tag out procedures as required. |
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When possible, remove the panels and inspect the following:
- Ensure that you are familiar with the input terminations, output terminations, buses, and other components of the UPS that may still have voltage present.
- Verify that the power cables and other wire cable routings do not contact any sharp metal edges or unprotected metal edges.
- Verify that the power connections and the connections for the control wires on the following are correct and tight: Verify the capacitor banks, bus bars, circuit breakers, switches, grounding straps, transformers, terminal strips, ribbon cables, and PCA.
- Verify that the DC power cable connections to the bus bars, circuit breakers, switches, and terminal strips are correct and tight.
- Verify that the power cable connections and the connections for the control wire for any external maintenance bypass cabinet are correct and tight.
- Verify that the power cable connections and the connections for the control wire for any auxiliary cabinets and RASPs are correct and tight.
- Verify that there are no visible signs of interior damage. Check all installed components and assemblies, mounting points, and the structural integrity of the cabinet.
- Verify that the wiring is tight.
- Verify that the AC capacitor assemblies and the DC capacitor assemblies have the proper phase and proper connections.
- Verify that the interior of the UPS is free of foreign items. Items may include extra wire, tools, loose hardware, and any other objects that do not belong in the UPS.
Inspecting the Battery Cabinet
When possible, remove all panels from the battery cabinet. Record the battery manufacturer, the model number for the battery, the number of batteries, and the battery date code.
Inspect the following:
- Ensure that you are familiar with the power terminations, buses, and other components of the battery cabinet. Voltage could be present under certain conditions.
- Verify that the cable routing for DC power, wire cable routing, and wire runs do not contact sharp metal edges or unprotected metal edges.
- Verify that the following are correct and tight. Verity the DC power cable, interconnections for the battery, connections for control wire to the bus bars, circuit breakers, terminal strips, and all other connectors.
- Verify that grounding straps have been installed between the cabinets
- Verify that the power cable connections are correct and tight.
- Verify the connections for the control wire to any external disconnects for the DC power are correct and tight.
- Verify that no DC ground faults are present.
- Verify that the battery cabinet temperature sensor (AITZ sensor) is installed.
- Verify that there are no visible signs of interior damage. Check all installed components and assemblies, mounting points, and the structural integrity of the cabinet.
- Verify that the interior of the battery cabinet is free of foreign items. Items include extra wire, tools, loose hardware, and any other objects that do not belong in the UPS.
- Verify that grounding straps have been installed between the UPS cabinets.
Verifying the Battery
- Verify the DC polarity of the battery string at the disconnects. Refer to Table 1 for disconnect configurations.
Show/hide table
Table 1 DC Disconnect Polarity Two-pole device or only using two poles of a three-pole device Polarity of the battery string matches with the polarity of the cables from the Rectifier/Charger Three-pole device containing a loop or jumper bridging between one of the Line & Load poles Polarity of the battery string matches with the polarity of the cables from the Rectifier/Charger Three-pole device splitting the battery string into two halves Polarity for the summation of the two half-strings making up the battery matches with the polarity of the cables from the Rectifier/Charge
- Arrange to have any polarity discrepancies resolved.
- Verify that the voltage is at the rated DC voltage.
Inspecting the Auxiliary Cabinet and Accessories
When possible, remove all panels from the auxiliary cabinets. Record the serial numbers and model numbers for the cabinets. Inspect the following:
- Ensure that you are familiar with the input and output terminations, bus work, and other components of the UPS that may still have voltage present.
- Verify that there are no visible signs of interior damage. Check all of the installed components and assemblies, mounting points, and the structural integrity of the cabinet.
- Verify that the routing for the power cable, wire cables, and the wire runs do not contact sharp metal edges or unprotected metal edges.
- Verify that the connections for the power cable and the connections for the control wire of the following are correct and tight. Verify the bus bars, circuit breakers, switches, transformers, terminal strips, ribbon cables, and PCAs.
- Verify that grounding straps have been installed between the cabinets
- Verify that the connections for the control wire to any external maintenance bypass cabinets are correct and tight.
- Verify that the connections for the control wire to any auxiliary cabinets and RSAP are correct and tight.
- Verify that the interior of the auxiliary cabinet is free of foreign items. Items may include extra wire, tools, loose hardware, and any other objects that do not belong in the cabinet.
Inspection for Field Upgrades
- Verify that the system has been updated per all service letters and service programs.
- Communicate any upgrade recommendations to the customer.
Note: To complete basic preventive maintenance, refer to Testing and Adjusting, "Unit Final Check".