Filter
Top Products
Options/Accessories
990-4049
Installation Guide APC Silcon 240-320kW 480V UPS 69
6.4.3.5 Display of Measured Value
See Display of Measured Value in the APC Silcon User Guide.
Time reading and utility 2 current not visible from remote display.
6.4.3.6 Alarms
See Alarms section in the APC Silcon User Guide.
6.5 Isolation Transformer Module
Isolation transformer modules can be used in the following configurations:
1. Between utility supply and UPS input, in a 3-phase Delta-service-phase or midpoint of 2
phases (grounded)
2. Between utility supply and UPS input for galvanic isolation
3. Between UPS output and load for galvanic isolation
4. Between UPS output and load for voltage stepping from 480V - 208V/Y 120V required
Do not use switch gear to bypass isolation transformers. If bypassed, damaging circulation
currents may occur, even with a unity turn ratio.
Coupling Methods
Configuration of isolation transformers is as Delta-WYE with accessible neutral (Dyn11)
Recommended use:
• 3 wires in/out
• 3 wires in/4 wires out
• 4 wires in/out
6.5.1 Requirements on Site
All isolation transformer parts are accessible from front or top (cable entries accessible from
bottom). Isolation transformer may be placed close to walls, allowing free space for the front
door to open. Allow free space for ventilation slots for sufficient cooling.
Do not expose isolation transformers to direct sunlight.
CAUTION!
Use only one type of isolation transformers for dual utility input.
NOTICE!
Check correct phase connection of inputs and outputs.
CAUTION!
At 100% switch mode load, the neutral must be rated for 173% output phase current.
NOTICE!
All external cable dimensions are recommeded sizes only. Refer to local regulations.