Emerson 200, U/300/S/12P, U /400/S/12P, U/300/S/6P, U /400/S/6P Operator Control And Display Panel

Chapter 4 Operator Control And Display Panel 37

Alarm message		Description
		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
Inverter overtemp.		recover automatically after a 5 minute delay from the disappearance 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
		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
Unit over load		checking the load percent indicated on the LCD 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 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.
System over load		1. Confirm that the alarm is true by checking the system load percent indicated on the LCD 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 load transferred to
Unit over load timeout		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
Bypass phase reverse		120 degrees behind phase A, and the phase of 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
Load impact transfer		A transfer to bypass occurred due to a large step load. The UPS should recover automatically. Turn
		on connected equipment in sequential order to reduce the step loading of the inverter
Transfer time-out		The load is on bypass power due to excessive number of transfers that occurred 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
		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 Synchronization is active. The UPS is acting as an LBS master or slave in a dual bus
		configuration
LBS abnormal		UPS set to LBS mode (master or slave), but no LBS signal on LBS bus. Check the LBS bus
		connection
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