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Take The Fear Out Of Alarms

Tuesday, October 15, 2019

Your Digital ProcessPower® (DPP) Uninterruptible Power Supply (UPS) system may be known as one of the most reliable pieces of equipment around the plant. In fact, you may only need to pay attention to it while conducting preventative maintenance. However, if any emergency arises, there’s nothing scarier than seeing the bright red alarm and needing to quickly troubleshoot an issue.

The DPP UPS system comes with two standard indicators and a large variety of optional alarm indicators that can be included on your system’s display panel. Our standard LED indicators on the front panel include UPS Normal (green) and UPS Trouble (red). The UPS Trouble indicator will illuminate when there is any alarm. With our additional options, you can add one green indicator and up to nine red optional alarm indicators to the front panel.

It is important to know the alarms your system is equipped with and their causes so you can amend the issue as quickly as possible to get your system back online. Below we’ve broken down some of the most common alarms, the conditions and typical causes. If you need a more in-depth look at your system and troubleshooting problems, our week-long UPS and Stationary Battery training courses include a section covering the 60+ alarms, conditions and causes.




Battery Breaker Open

The Battery input breaker has automatically or manually been opened

  1. Input current exceeds breaker rating (tripped breaker)
  2. The breaker has manually been opened
  3. Defective control breaker or panel control board
  4. See “Low DC Disconnect” Alarm

Battery Discharging

The Battery bus voltage is below the battery discharging alarm level

  1. See “Charger Failure” Alarm
  2. Battery discharging alarm setpoint is too high
  3. Defective panel control board

Bypass To Load

The Static Switch is in the bypass position

  1. The Static Switch has manually been placed in the bypass position
  2. An event has occurred that has caused an automatic transfer to bypass

Charger Failure

The DC voltage is lower than 96% of DCV class

  1. Charger is not running, control breaker is open
  2. Fuses are blown
  3. Low or no AC input voltage
  4. Loss of input phase
  5. Charger bridge is over heating
  6. Loss of communication with the charger board

Fan Failure

One or more of the fans providing cooling has failed

  1. Defective fan or panel control board

Inverter Failure

The Inverter voltage is below 80% of ACV class

  1. Inverter is not running, switch in off position
  2. Loss of communication with the Inverter board

Low DC Connect

The DC voltage is below the low DC disconnect alarm level. The battery breaker will shunt trip open under this condition

  1. The DC Input is below the Low DC Disconnect Setpoint
  2. Batteries have discharged to the cut off voltage
  3. Low DC Disconnect setpoint is too high

Overload Shutdown

The Inverter has shutdown due to an overload condition

  1. Exceeds 100% of the rated KW
  2. Defective panel control board

In addition to front panel LED indicators for alarm status, we offer software that allows you to look at alarms from anywhere. UPSView™ is a software option that allows you to remotely view the stats of your UPS system, including all alarms. The dashboard includes an alarm tab featuring each alarm color coded in green or red based on its current status.

We strive to take the fear out of alarms by making viewing and troubleshooting them as easy as possible with optional front panel LED indicators, software to remotely monitor and see alarms and training that covers each alarm and its common causes. If it’s an emergency and you are unable to diagnose an alarm on your own, our technical team is available 24/7 to assist you.


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