UPS 120, UPS 150, UPS 250 and UPS 300 Uninterruptible Power Supplies Caterpillar

Troubleshooting

Usage:

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Personal injury or death can result from high voltage.
When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.
Improper test equipment can fail and present a high voltage shock hazard to its user.

Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.

Display Window

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Table 1
Display Window
Problem	Cause	Solution
The display window is blank.	The contrast is too light.	Press the up arrow in order to darken the display.
The display window is black.	The contrast is too dark.	Press the down arrow in order to lighten the display.

Emergency Power Off Switch

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Table 2
Emergency Power Off Switch
Problem	Cause	Solution
The system will not restart after the EPO switch has been pressed.	When the EPO switch is pressed, the circuit breaker trips open.	Open the front door and reset the small circuit breaker for the EPO switch.

Fan

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Table 3
Fan
Problem	Cause	Solution
Fan failure is displayed. Fans are equipped with flow indicators.	The outlet for the fan is obstructed.	Remove the obstruction from the top of the system.
	The doors for exhaust do not open.	Ensure that the doors open and close freely.
	The fans are not plugged into the printed wire board for the Fan Monitor.	Ensure that you have good connections.
	The fuses are blown on the printed wire board for the Fan Monitor.	Replace any fuses that are blown.

Unstable Vacuum During Initial Start-up

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Table 4
Unstable Vacuum During Initial Start-up
Problem	Cause	Solution
The vacuum increases during start-up of the system.	Thermal activity within the flywheel causes an increase in pressure. Causes the system to cycle on and off until the pressure for the vacuum equalizes.	Normal condition for initial start-up.

Flywheel Rotation

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Table 5
Flywheel Rotation
Problem	Cause	Solution
Tachometer reading is 0 or there is no perceptible change in rotor speed.	The flywheel is not charging.	Make sure that the key switch is in the "Online" position.

Display Panel

Events and Notices

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Table 6
Display Panel
Problem	Cause	Solution
The display panel is beeping.	An event has occurred.	Go to the Event Log in order to determine the type of Event that has occurred.
The system is regularly displaying Notices on the LCD Display.	The system is providing warning indications and may need attention or service.	Keep a record of frequent Notices. Contact your Cat dealer in order to discuss possible maintenance actions.
Notice event: "System Waiting on Vacuum" The system loses some vacuum and the system temperature rises when the system first begins to run.	Systems that are cold started may have collected some moisture inside the flywheel housing. As the system heats up, the moisture will evaporate temporarily. Causes the vacuum pressure to increase.	Notice should go away once the system has been running for several hours.
Notice event: "Vacuum gauge warning: Over maximum value" or "System Waiting On Vacuum"	There are three possibilities. The vacuum pump has failed to start. The vacuum has not been maintained. The vacuum pump is not running correctly.	Make sure that the auxiliary AC power is provided to the system. Make sure that the vacuum valve that is located on the bottom of the flywheel housing is closed. Call Caterpillar Service if any problems (vacuum pump) continue.
Notice event: Radial or axial bearing vibration warning: Over limit	Something has caused excessive vibration to the system or the bearings may need service.	Make sure that the system was not damaged by any outside force. Make sure that the vibration is back in the normal range or check for additional vibration notices in the Event Log. Use the display terminal or UPS View in order to make sure that the force is < 0.25 of gravity. If excessive vibrations continue, contact Cat dealer Service.
Notice event: "__ warning. Over limit: __"	A telemetry setpoint on the system has been exceeded, rendering a warning message.	Call Caterpillar Service to discuss possible maintenance actions.