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This document is a reference guide to install the Daker DK UPS 4,5-10kVA in parallel for N+1
redundancy operation. The parallel installation and configuration procedure is divided in 4 phases :
Parallel system installation – To physically connect each unit.
Single Unit check – To verify and confirm that each unit works properly with the correct
parameters and output voltage
Parallel Setting – To setup each units' parameters to work in parallel mode.
Parallel Mode Start up – To verify that the parallel system works normally.
• Only qualified and trained electricians are allowed to install the UPSs in single unit or parallel
systems.
• Please read the Installation guide carefully before installing these UPSs to avoid electrical
hazards or damages to the UPS and the loads connected.
• To prevent potential leakage current hazard, ensure that the AC main supply is securely grounded.
• Please note that the Parallel function of the UPS can be enabled only in "Normal Mode" operation.
• Before to set a parallel installation, ensure that the output voltage tolerance for each UPS at
zero-load condition is less than 0.5Vac.Please consult your authorized dealer if any of the UPS
output voltage has the tolerance over 0.5Vac.
• Ensure that the communication cables plugged into the UPS RJ45 connectors are connected
securely to avoid damage to both the UPS and the output devices.
• Ensure that two and only two UPS units of the parallel system have the terminal resistors on the
rear set in "On" position.
• Only UPS with the same rating and type can be installed in parallel.
• Please ensure to add a 40Arms/250Vac and 30Arms/250Vac NFB(Non-fuse Breaker)at the input
and output of each UPS respectively.
4
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1 Important Safety Instructions
Introduction
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