Operator Control Panel and Display

Table 23

UPS messages

 

 

 

 

 

Message

 

 

Description / Suggested Action (if any)

 

 

 

This alarm is triggered by an inverter software routine when the amplitude or

 

 

 

frequency of bypass voltage is beyond the normal range.

 

 

 

The amplitude threshold is fixed for positive and negative 10% rating.

 

 

 

This alarm automatically resets once the bypass voltage goes normal.

Bypass Unable to Trace

 

1. First verify that the bypass voltage and frequency displayed on the panel is within

 

the selected range. Note here the rated voltage and frequency are specified by

 

 

 

 

 

 

“Output voltage level” and “Output frequency level” respectively.

 

 

 

2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage

 

 

 

and frequency presented to the UPS. Check the external supply if it is found to be

 

 

 

faulty.

 

 

 

This alarm is triggered by an inverter software routine when the amplitude or

 

 

 

frequency of bypass voltage exceeds the limit.

 

 

 

This alarm automatically resets once the bypass voltage goes normal.

 

 

 

First check if there are some relevant alarms such as “Bypass disconnect open”,

 

 

 

“Bypass phase reverse” and “Mains neutral lost”. If they appear, solve them first.

 

 

 

1. Then verify that the bypass voltage and frequency displayed on the panel is

Bypass Abnormal

 

within the bypass limit. Note here the rated voltage and frequency are specified by

 

 

 

“Output voltage level” and “Output frequency level” respectively.

 

 

 

2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage

 

 

 

and frequency presented to the UPS. Check the external bypass supply if it is found

 

 

 

to be faulty. If the utility is likely to trigger this alarm frequently, the bypass limit can

 

 

 

be changed a little larger through the configuration software according to the

 

 

 

customer’s agreement.

 

 

 

This alarm is triggered by an inverter software routine when the inverter and bypass

 

 

 

waveforms are misaligned by more than 6 degrees in phase. This alarm resets

 

 

 

automatically once the condition is no longer true.

Inverter Asynchronous

 

1. First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If

 

 

 

so, solve it first.

 

 

 

2. Verify the waveform of the bypass voltage. If it is too distorted, ask the customer

 

 

 

to verify and seek any possible measurements.

Inverter Fault

 

Inverter output voltage beyond limits. Load transfers to bypass.

 

 

 

 

 

 

 

The temperature of the inverter heat sink is too high to keep inverter running.

 

 

 

This alarm is triggered by the signal from a temperature monitoring thermostat on

 

 

 

the inverter bridge heat sink.

 

 

 

The UPS will recover automatically after a 5 minute delay from the disappearance

Inverter Overtemp.

 

of the overtemperature signal.

 

If the overtemperature condition is true, then check for and verify:

 

 

 

 

 

 

1. high ambient air temperature.

 

 

 

2. blocked cooling airway.

 

 

 

3. any fan failure.

 

 

 

4. prolonged inverter overload

Fan Fault

 

 

At least one of the cooling fans has failed

 

 

 

 

Inverter STS Fail

 

At least one of the static switches of inverter side is open or short circuit. This fault is

 

locked until power off.

 

 

 

Bypass STS Fail

 

At least one of the static switches of bypass side is open or short circuit. This fault is

 

locked until power off

 

 

 

Operation Invalid

 

This record is registered following an incorrect operation:

 

 

 

 

Output Fuse Fail

 

At least one of the inverter output fuses is blown. Inverter shuts down. Load

 

transfers to bypass.

 

 

 

Control Power 2 Fail

 

UPS operates but Redundant Control Power is not available.

 

 

 

 

 

 

 

The UPS is confirmed to be overload when the load arises above 105% nominal

 

 

 

rating.

 

 

 

The alarm automatically resets once the overload condition is removed.

 

 

 

1. Confirm that the alarm is true by checking the load percent indicated on the LCD

Unit Over load

 

panel to determine which phase is being overloaded.

 

 

 

2. If the alarm is true, measure the actual output current to verify that the indications

 

 

 

are valid.

 

 

 

Disconnect unnecessary load and ensure the safety. In a parallel system, a severe

 

 

 

load sharing error can also leads to the alarm.

99

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Emerson 50 and 60 Hz, 400V, 30-200kVA user manual Frequency of bypass voltage is beyond the normal range
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