Installation guide

16 Installation Guide Silcon DP300E 480V 120-160kVA
7OH0006 US rev. 03
Connection
4.1.5 Dual and single utility supply
WARNING!
UPS units contain hazardous AC and DC voltages. A qualified electrician must install
the UPS, AC line service, and external batteries according to national and local codes
and must be familiar with batteries and battery installation.
Before installing, maintaining, or servicing the UPS, shut off the UPS and disconnect
all sources of AC and DC power.
The installer must provide each external disconnecting device for this UPS system
with labels having the following wording:
“According to local/national codes for working on electrical equipment”.
Isolate the Uninterruptible Power Supply (UPS) as instructed in this guide before
working on the circuit.
Whenever AC and/or DC voltage is applied, there may be AC voltage at the UPS
output; this is true because the UPS can supply output power from utility or from its
batteries. To avoid equipment damage or personal injury, always assume that there
may be voltage at the UPS output.
This system is equipped with an auto-start function. If activated the system may start
without warning. Please refer to chapter 4: “Programming parameters” in User Guide
to ensure de-activation.
All Silcon DP3120E – DP3160E comes with dual utility input as standard. If dual
utility does not appear or if it not needed, a small modification has to be made in the
system, see chapter 4.1.6 for changing from dual to single utility input.
Working principle of dual utility (2 utility supplies):
NOTE:
Max. phase shift between utility
1 and 2, less than ±3 degrees.
Utility 1 and 2 voltage and
frequency tolerance, see
specification in chapter 6.
Utility 1 supports the load in
normal operation, and utility 2
supports the load through the
static and service bypass
switch.
Q3
Q10a
Q2a
Utility 2
Utility 1
DP300E
Q1a
Utility 2
Utility 1
Output