Single Input/ Dual Input Modification - Delta Modulon DPH series User Manual

To avoid UPS failure, the input of the UPS must be a Y connection.
If there is a floating voltage between the input power's neutral (N) and the ground (
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 isolation transformer's
secondary neutral (N) and the ground (
The main AC source must be a three-phase four-wire system and meets the specifications
specified on the UPS rating label. For main AC source connection, make sure it is in
positive phase sequence. Please refer to 5.5.3 Single Unit Wiring and 5.5.4 Parallel
Units Wiring for wiring information.
For external battery cabinet connection, please check the battery polarity. Do not connect
the batteries in reverse. Please refer to 5.6 External Battery Cabinet Connection
Warnings.
5-16 and Figure 5-19 for grounding information.
Figure 5-14.

5.5.2 Single Input/ Dual Input Modification

The UPS default setting is single input. If you want to modify it into dual input, please follow
the procedures below.
Modulon DPH Series
1. In accordance with National Electrical Codes (NEC), please install a suitable
conduit and bushing for cable protection.
2. Please refer to national and local electrical codes for acceptable non-fuse
switches, breakers and cable size.
3. The cables mentioned in Table 5-2 with PVC material and with temperature
resistance up to 105°C are suggested.
4. The tightening torque for M12 screw should be 500±20Kgf.cm.
WARNING:
1. Wrong wiring will cause damage to the UPS and electric shock.
2. The UPS will not work normally if the main AC source's neutral (N) is not firmly
connected or not connected to the Delta or non-Delta external maintenance
bypass cabinet's AC Input neutral (N) terminal.
3. If the UPS is not grounded, the power boards and components might be
damaged after the UPS is powered on.
WARNING:
Only authorized Delta engineers or service personnel can modify single input/ dual
input setup.
) to the nearest place of the transformer.
5-10
), and
Figure