Delta Modulon DPH 200kVA, User Manual, Page: 10 / 232

1-4
Modulon DPH Series
y
The installation of protective devices is highly recommended when the UPS is connected
to power sources.
y
The protective devices connecting to the UPS must be installed near the UPS and easily
accessible for operation.
y
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).
200kVA 300kVA 400kVA 500kVA
10kA 10kA 12.12kA 15.15kA
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.
y
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.
y
The recommended electrical rating of the backfeed protective device is as follows.
200kVA 300kVA 400kVA 500kVA
690V/ 400A 690V/ 600A 690V/ 800A 690V/ 1000A
1.3 Usage Warnings
y
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.