User Manual

Figure 6.14
Automatic Transfer
Switch Break
Before Make with
2 second center off
delay
Generator
Distribution
Panel
208/120
VAC 3
Phase
Utility
Air Conditioning
Building Lighting
Non-critical Devices
Critical
Headend
Devices
Headend UPS Electrical One Line
208 VAC 3 phase site power, 208VAC to 240/120 VAC isolation transformer
Alpha 1600 Series, 18 KVA Single Phase - 240VAC input, 240/120 VAC output
Internal Static Bypass, External "Make before Break" Maintenance Bypass
125 Amp
208VAC
UPS
Breakers
Phase Order
L1, L2
240/120VAC
4 wire
(L1, L2, N, G)
4 AWG Max
240 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
240/120VAC
4 wire
(L1, L2, N, G)
4 AWG Max
Alpha 18 KVA UPS
Rectifier
Static
Bypass
Inverter
125 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.
208 VAC
input
240/120
VAC
output
25 kVA
transformer
Do not place transient
generating equipment,
such as Air Conditioning,
on the UPS
UPS
isolating
switch or
breaker
UPS MUST be in STOP MODE before switching to BY-PASS
The Alpha BPS Series
Doc# 020-133-B0 Rev. 01 / 07
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