Usage Warnings - Delta Modulon DPH series User Manual

The installation of protective devices is highly recommended when the UPS is connected
to power sources.
The protective devices connecting to the UPS must be installed near the UPS and easily
accessible for operation.
Protective Devices:
1. It is suggested that you install appropriate protective devices between the UPS and
input AC power. The protective devices should have the functions of over current
protection, short circuit protection, insulating protection and shunt trip feature. Please
refer to the table below for different UPS's cut off current (Icc).
2. For selection of the protective devices, please take each power cable's current
capacity and the system's overload capacity (please refer to Appendix 1: Technical
Specifications) into consideration. Besides, the short-circuit capacity of the upstream
protective devices must be equal to or higher than the capacity of the UPS's protective
devices.
3. For single input, when the UPS has abnormalities and input short current reaches
20kA, the UPS's internal semi-conductor fast-acting fuses need 8ms ~ 10ms to be
fused. Thus, the upstream protective devices' reaction time should be more than
10ms to let the UPS's internal protective devices block breakdown and let the UPS
transfer to bypass mode.
4. For dual input, please install the protective devices between the UPS and the main
AC source as well as between the UPS and the bypass AC source.
If the UPS is supplied by a power source whose neutral is grounded, the backfeed
protective device installed as UPS input protection must be a 3-pole type. If the UPS
is supplied by a power source whose neutral is not grounded, the backfeed protective
device installed as UPS input protection must be a 4-pole type.
The recommended electrical rating of the backfeed protective device is as follows.
1.3

Usage Warnings

Before installation, wiring and working on the UPS's internal circuits, please completely
cut off all power supplying to the UPS, including the input power and battery power.
Modulon DPH Series
200kVA
10kA
200kVA
690V/ 400A
300kVA
10kA
300kVA
690V/ 600A
1-4
400kVA
12.12kA
400kVA
690V/ 800A
500kVA
15.15kA
500kVA
690V/ 1000A