AEC IST7 20kVA, User Manual

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2 Overview
AEC UPS IST7 10-30 KVA
User Manual
62

Parallel SystemStartup and Shutdown
2.4.1 Start Parallel System

Before start the parallel system, please perform the operation of 2.3 UPS Start and Shutdown for
each UPS.

Before power on and test the parallel system, please ensure that the wire connection of input and
out cables and phase sequence is right and the parallel wire is well connected and stay in
disconnection status.

Before completely starting the parallel system, please do not start load, and ensure that all switches
of load are off.

Before performing the parallel wire operation, please do not connect the parallel wire.
Measure the front-end voltage and frequency of all UPS input (including mains input and bypass input) breaker or
external input distribution breaker. Voltage range: 80V-280V, frequency range: 40Hz~60Hz
（
50Hz system
）
or
50Hz~70Hz
（
60Hz system
）
.
Connect the parallel wires, close the mains breaker and bypass breaker (keep all UPS breakers are off) of all UPS.
If input power normal, rectifier will start automatically, the touch screen starts.Connect battery to parallel system.
If all UPS monitor page without abnormal alarm, close battery breaker of each UPS’s battery cabinet (if there are
many groups battery, it is necessary to close each battery breaker and then close the total breaker between battery
groups and UPS). Measure the voltage of battery breaker (if there are many groups battery, measure the voltage of
each group battery, and then measure the voltage of total battery breaker).Ensure that the battery connection is
proper (in 2min, all the “battery circuit abnormal” alarm on main page of the touch screen disappear).
Check the system alarm, and see if all the alarms are disappear. If there is any fault, please stop startup operation,
and contact service person to solve the problems.
Start each UPS. Ensure that all UPS stay in bypass power supply mode, and with no abnormal alarm, switch on the
external distribution switch, switch off the UPS output switch, and start the inverter of each UPS manually, all UPS
turns to inverter power supply.
Measure the output voltage and frequency of each UPS. After each UPS turns to inverter power supply (user can
check whether the system stay in inverter power supply mode through system running status), check whether the
UPS three-phase output voltage and frequency is normal by the real-time data in touch screen, measure the front-