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To avoid UPS failure, the input of the UPS must be a Y connection and the UPS neutral
(N) must be connected. Do not connect the UPS neutral (N) with the ground ( ).
and you require that the VNG of the UPS should be zero, we suggest that you install an
isolation transformer in front of the input side of the UPS, and connect the UPS neutral
(N) with the ground ( ).
AC Power Source Connection
Three phases (R/ S/ T) of the AC power source must be in positive phase sequence,
and R, S, T and N cables of the AC power source must be connected to the 'R',
'S', 'T' and 'N' interfaces marked on the AC Input Block and the Bypass Input Block
accordingly.
External Battery Cabinet Connection
Connect positive and negative poles and the neutral terminal of an external battery
cabinet to the '+', '-' and 'N' interfaces marked on the Battery Input Block. Do not make
a wrong connection.
External Battery Cabinet Grounding
Connect an external battery cabinet's grounding terminal to the terminal of ground ( ).
Do not connect the grounding terminal of the external battery cabinet to any other
grounding system.
The terminal of ground ( ) must be grounded. Please use ring-type terminals for wir-
ing.
WARNING:
1. Wrong wiring will cause damage to the UPS and electric shock.
2. The UPS will not work normally if the input power's neutral (N) is not firmly
connected or not connected to the AC Input Block's neutral (N) terminal.
WARNING:
Only authorized Delta engineers or service personnel can modify single input/ dual
input setup.
The UPS default setting is single input. If you want to modify it into dual input, please follow
the following steps.
5-9
5
Installation and Wiring
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