User Manual

Figure 6.13
Automatic Transfer
Switch Break
Before Make with
2 second center off
delay
Generator
Main
Distribution
Panel
240/120
VAC Split
Phase
Utility
Air Conditioning
Building Lighting
Non-critical Devices
Critical
Headend
Devices
Headend UPS Electrical One Line
Alpha 1600 Series, 18 KVA Single Phase - 208VAC input, 240/120 VAC output
Internal Static Bypass, External "Break before Make" Maintenance Bypass
100 Amp
208VAC
UPS
Breakers
Phase Order
L1, L2
240/120VAC
4 wire
(L1, L2, N, G)
4 AWG Max
208 VAC
3 wire
(L1, L2, G)
4 AWG Max
Dedicated UPS
Distribution Panel
Split phase
240/120 V
UPS
BYPASS
240/120VAC
4 wire
(L1, L2, N, G)
4 AWG Max
208/120VAC
4 wire
(L1, L2, N, G)
4 AWG Max
100 Amp
208VAC
UPS Bypass
Breakers
Phase Order
L1, L2
Bring
Neutral thru
to bypass
switch
Alpha 18 KVA UPS
Rectifier
Static
Bypass
Inverter
Dimensions
11 15/16" W x
24 5/8 " H x
9 7/8 " D
Weight 33 lbs
100 Amp
3 Pole
Bypass Switch
Input 1 Input 2
output
The neutral from the UPS, MUST go to the MBS, not back to the main distribution
panel connected to commercial power to maintain isolation and prevent ground loops.
Any 240VAC
loads must
be capable
of operating
on 208 VAC
UPS MUST be in “STOP”
position prior to operating
the Maintenance Bypass
Switch
Schematic Diagrams
Doc# 020-133-B0 Rev. 01 / 07
25