Installation guide

67Installation Guide Silcon DP300E Series 480V 120-160kVA
7OH0006 US rev. 03
NOTE:
is symbol for “risk of
electric shock”.
Terminal for Equipment
Grounding Conductor is
marked
Terminal for Grounding
Electrode Conductor is
marked “E”.
NOTE:
The terminals marked
and
are electrically connected to the
terminal marked “E”.
Options/Accessories
5.8.2 Cubicles and dimensions
See the installation guide for Isolation Transformer.
5.8.3 Foot prints
See the installation guide for Isolation Transformer.
5.8.4 Connecting the isolation transformer
See the installation guide for Isolation Transformer.
5.8.1 Requirement on the installation site
The isolation transformer is designed with all parts accessible from front or top, and
cable entries from bottom. The isolation transformer can be placed close to walls,
only free space for front door opening has to be ensured. Sufficient cooling has to be
ensured by a free space for ventilation slots. Avoid placing the isolation transformer
in direct sunlight. See also Installation Guide from transformer supplier.
WARNING:
At 100% switch mode load, the
neutral shall be rated for 173%
output phase current.
NOTE:
All external cable dimensions
are recommended.
Refer to local/national legal
codes.
NOTE:
Ensure correct phase con-
nection of inputs and outputs.
NOTE:
Grounding, refer to local/
national legal codes.
5.8 Isolation Transformer Module
Introduction.
The isolation transformer module is used in following mentioned configurations:
1. Between utility supply and UPS input, when a 3-phase Delta-service, phase
or midpoint of 2 phases grounded, is available.
2. Between utility supply and UPS input, when galvanic isolation is required.
3. Between UPS output and load, when galvanic isolation is required.
4. Between UPS output and load, when step down from 480V to 208V/Y120V is
required.
The isolation transformer may not be bypassed by any kind of switchgear. Even if
the turn ratio is unity, heavy and damaging circulation currents can occur, when the
transformer is bypassed.
Coupling methods:
The isolation transformer is configured as Delta-WYE with accessibel neutral
(Dyn11).
Recommended use:
• For 3 wires in/out.
• For 3 wires in / 4 wires out.
• For 4 wires in/out.
WARNING:
For dual utility the same type of
isolation transformers always
has to be used for the 2 utility
input.