Chapter 4 Operator Control And Display Panel | 37 |
| Alarm message |
| Description |
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| The temperature of the inverter heat sink is too high to keep inverter running. This alarm is triggered |
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| by the signal from a temperature monitoring thermostat on the inverter bridge heat sink. The UPS will |
| Inverter overtemp. |
| recover automatically after a 5 minute delay from the disappearance of the overtemperature signal. If |
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| the overtemperature condition is true, then check for and verify: 1. high ambient air temperature. 2. |
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| blocked cooling airway. 3. any fan failure. 4. prolonged inverter overload |
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| 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 |
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| power off | |
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| Bypass STS fail |
| At least one of the static switches of bypass side is open or short circuit. This fault is locked until |
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| power off | |
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| Operation invalid |
| This record is registered following an incorrect operation |
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| The UPS is confirmed to be overload when the load arises above 105% nominal rating. The alarm |
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| automatically resets once the overload condition is removed. 1. Confirm that the alarm is true by |
| Unit over load |
| checking the load percent indicated on the LCD to determine which phase is being overloaded. 2. If |
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| the alarm is true, measure the actual output current to verify that the indications are valid. | |
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| Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing error |
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| can also leads to the alarm |
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| The UPS parallel system is confirmed to overload when the total load arises above 105% nominal |
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| rating for the set basic number of UPSs. The alarm automatically resets once the overload condition |
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| is removed. |
| System over load |
| 1. Confirm that the alarm is true by checking the system load percent indicated on the LCD to |
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| determine which phase is being overloaded. 2. If the alarm is true, measure the actual output current | |
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| to verify that the indications are valid. |
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| Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing error |
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| can also leads to the alarm |
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| The UPS is confirmed to overload and the overload times out. |
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| Note 1: the highest loaded phase will indicate overload |
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| active then alarm “unit overload” should also be active as the load is above nominal. |
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| Note 3: When the timer has expired, the inverter Static Switch is opened and the load transferred to |
| Unit over load timeout |
| bypass. The inverter shutdown and will restart after 10 seconds. Note 4: If the load decreases lower |
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| than 95% after 5 minutes, the system will transfer back to inverter mode. |
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| Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an overload |
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| is indicated then check the load, and investigate any additional load connected prior to the alarm (if |
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| applicable) |
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| Byp. abnormal shutdown | Both bypass and inverter voltages unavailable. Load interruption | |
| Inverter over current | Inverter pulse width modulation module overloaded | |
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| The phase sequence direction of bypass voltage is reversed. Normally, the phase of phase B lags |
| Bypass phase reverse |
| 120 degrees behind phase A, and the phase of phase C lags 120 degrees behind phase B. |
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| Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if it | |
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| is found to be in error |
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| Load impact transfer |
| A transfer to bypass occurred due to a large step load. The UPS should recover automatically. Turn |
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| on connected equipment in sequential order to reduce the step loading of the inverter | |
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| Transfer |
| The load is on bypass power due to excessive number of transfers that occurred within the last hour. |
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| The UPS will recover automatically and will transfer the load back to inverter power within an hour | |
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| 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 |
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| on the UPS which passive transfer to bypass | |
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| Parallel board fault |
| Malfunction of the paralleling control circuits of this UPS module. Can cause system transfer to |
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| bypass | |
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| 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 |
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| INVERTER ON button |
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| Bypass over current | Bypass current is over limit above 135% rating. The UPS just alarms and does nothing | |
| LBS Active |
| Load Bus Synchronization is active. The UPS is acting as an LBS master or slave in a dual bus |
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| configuration | |
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| LBS abnormal |
| UPS set to LBS mode (master or slave), but no LBS signal on LBS bus. Check the LBS bus |
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| connection | |
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| Byp. induct overtemp. | Bypass load sharing inductor overtemperature. Check the environment and ventilation | |
| Static Sw. overtemp. | Overtemperature of static switch on bypass or inverter side. Check the environment and ventilation |
HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual