Operator Control Panel and Display

Table 23

UPS messages

 

 

 

 

 

Message

 

 

Description / Suggested Action (if any)

 

 

 

The UPS parallel system is confirmed to overload when the total load arises above

 

 

 

105% nominal rating for the set basic number of UPSs. The alarm automatically

 

 

 

resets once the overload condition is removed.

 

 

 

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

System Over load

 

the LCD 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.

 

 

 

The UPS is confirmed to overload and the overload times out.

 

 

 

Note 1: the highest loaded phase will indicate overload timing-out first.

 

 

 

Note 2: When the timer is active then alarm “unit overload” should also be active as

 

 

 

the load is above nominal.

 

 

 

Note 3: When the timer has expired, the inverter Static Switch is opened and the

Unit Over load Timeout

 

load transferred to bypass. The inverter shutdown and will restart after 10 seconds.

 

 

 

Note 4: If the load decreases lower than 95% after 5 minutes, the system will

 

 

 

transfer back to inverter mode.

 

 

 

Confirm that the alarm is genuine by checking the load percent indicated on the

 

 

 

LCD. If an overload is indicated then check the load, and investigate any additional

 

 

 

load connected prior to the alarm (if applicable).

Byp. Abnormal Shutdown

 

Both bypass and inverter voltages unavailable. Load interruption

Inverter Over Current

 

Inverter Pulse Width Modulation module overloaded.

 

 

 

 

 

 

 

The phase sequence direction of bypass voltage is reversed.

 

 

 

Normally, the phase of phase B lags 120 degrees behind phase A, and the phase of

Bypass Phase Reversed

 

phase C lags 120 degrees behind phase B.

 

 

 

Verify that the phase rotation of the bypass supply presented to the UPS is correct,

 

 

 

and rectify it if it is found to be in error

 

 

 

A transfer to bypass occurred due to a large step load. The UPS should recover

Load Impact Transfer

 

automatically. Turn on connected equipment in sequential order to reduce the step

 

 

 

loading of the inverter.

 

 

 

The load is on bypass power due to excessive number of transfers that occurred

Transfer Time-out

 

within the last hour.

 

The UPS will recover automatically and will transfer the load back to inverter power

 

 

 

 

 

 

within an hour.

Load Sharing Fault

 

UPS modules within a parallel system are not sharing the load current equally.

DC Bus Abnormal

 

DC input voltage to inverter beyond limits. Inverter shuts down. Load transfers to

 

bypass.

 

 

 

System Transfer

 

The whole paralleled UPS system transferred to bypass at the same time. This

 

message will appear on the UPS which passive transfer to bypass

 

 

 

Parallel Board Fault

 

Malfunction of the paralleling control circuits of this UPS module. Can cause

 

“System Transfer” to bypass.

 

 

 

 

 

 

Rectifier, inverter and battery converter were shutdown because DC bus voltage is

DC Bus Over Voltage

 

too high. Check whether there is a fault in rectifier side. If no, then check whether

 

 

 

overload occurs. Restart the inverter after resetting the fault

 

 

 

The parallel cables are not connected correctly in a parallel system.

Parallel Connect Fault

 

Reset the fault by pressing the “fault clear” button, then restart the inverter by

 

 

 

pressing the “inverter on” button.

Bypass Over Current

 

Bypass current is over limit above 135% rating. The UPS just alarms and does

 

nothing.

 

 

 

LBS Active

 

 

Load Bus Synchronisation is active. The UPS is acting as an LBS master or slave in

 

 

a dual bus configuration.

 

 

 

Setting Save Error

 

History records not saved. (Reserved)

Mains Neutral Lost

 

AC Input mains reference neutral not detected.

Protocol version clash

 

Firmware incompatibility between Monitor Board and Digital Signal Processor

 

Board.

 

 

 

Battery ground fault

 

Battery leakage to ground detected (option)

Inv. turned On Manually

 

Manual Turn On via front panel

100

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Emerson 400V, 50 and 60 Hz, 30-200kVA user manual 100

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