Battery Event: The number of times the UPS operated in the backup mode
Temp: The UPS cabinet temperature
2.4.6Alarm Relays – Standard: Dry contact signal relays closing for each of the following alarm conditions: Input Fail, On Bypass, Low Battery and Summary Alarm.
2.4.7Communication Ports – Standard: Three communication ports are available; two configured for RS232 protocol and one for RS485 data transfer. All parameters displayed on the front panel shall be available on these ports for remote monitoring.
2.4.8Power Flow Mimic – Optional: A laminated overlay with embedded color LEDs combines information on the front panel display with a graphic power flow visualization for instant load power status recognition.
After power is applied, the system is placed in STANDBY mode and a self-check ensues. During this period, the start subroutine checks for the input voltage and proper operation of the inverter and bypass SCRs. After the routine is completed and check confirmed OK, the system goes into the NORMAL mode.
The input contactor K1 receives a closing signal and connects the input power to the DC supply transformer. The DC rectifier supplies the battery charger, Control Board and the DC/AC inverter circuits. The battery charger is then activated allowing the batteries to be continuously charged. The on-line DC/AC inverter converts the DC voltage to a PWM (Pulse-Width-Modulation) waveform. This waveform is filtered and reconstructed back to clean AC output power for critical loads regardless of whether the unit is powered by the utility or battery backup.
2.5.3Response to Input Power Abnormal Condition If the system controller senses a change in input frequency of more than +3 Hz or an out of range input voltage, it will consider it an input failure and will immediately open the input contactor, isolating the UPS from the facility. At the same time, the charger is turned off and the battery bank becomes a DC supply source to the inverter circuit, maintaining an uninterrupted AC supply to the protected load without switching static bypass to prevent any glitches or risking the load. The LCD screen will display an alarm message. When the facility power returns and is in phase with inverter, the system controller closes the input contactor and the system returns to NORMAL automatically.
2.6BATTERY and BATTERY CHARGER SPECIFICATIONS
Standard Run Time: 90 minutes at full load
Extended Run Time: As required
Battery Type: Sealed, Maintenance free, lead-acid, VRLA (standard); other types are optional
Expected Life: 10 years
Charger Ampacity: Per UL 924
Float Voltage: 2.25 volts per cell
Protection: Circuit breaker in each battery cabinet
Wiring: Factory shall provide battery interconnecting cables. Power cables from the Inverter to the battery cabinet shall be provided by the customer based on local code.
Nominal DC Link Voltage: kVA/kW dependent.
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