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12 UPS System Operation
12.1 Operating Modes
The UPS Solution has four main operating modes that are automatically selected by the
Alpha FXM UPS unit depending on the state of the mains power supply to the site and
battery pack SOC. These are listed and described in Table 12-1 below.
Operating Mode
'LINE'
'INVERTER'
'RETRAN'
'SHUTDOWN'
NOTE: The current mode of operation is shown on the Alpha FXM UPS Unit's
LCD Display. Press any of the three buttons directly below the unit's display to
activate the backlight
For more information on all Alpha FXM UPS unit modes please refer to
667/HB/47760/000.
12.2 Active Fault Monitoring
The UPS Solution offers extensive fault monitoring options as described in the following
subsections. More information on all available fault information is detailed in the Alpha
FXM UPS Operating Manual – 667/HB/47760/000.
12.2.1 Fault / Alarm Relay Contacts
The UPS Solution provides six relay outputs via the UPS Connection Panel that can be
cabled directly to the traffic controller cabinet for fault monitoring with Siemens UTMC or
RMS systems. See section 12.2.2 for details.
Each relay offers a Normally Closed (NC), Common (C) and Normally Open (NO)
contact, making a total of 18 possible termination points.
Table 12-2 lists and describes the default names and settings for these contacts.
Version
7
Last Editor
Ore Oluwatudimu
Document
UPS Solution General Handbook
Name
Copyright ã Siemens plc 2017 All Rights Reserved
The normal operating mode of the UPS Solution.
Mains power is available from the site supply feeder pillar and is being
passed through the UPS to the traffic controller load.
Batteries are being charged or maintained using the mains supply.
Mains power is unavailable from the site supply feeder pillar.
The UPS Solution is providing battery backup power from all connected
battery packs.
Mains power from the site supply feeder pillar has been restored.
The UPS Solution assesses and qualifies the available mains supply
before switching back to 'LINE' mode.
Mains power from the site supply feeder pillar is unavailable and the
batteries have been discharged to the UPS unit's over discharge
threshold. The UPS Solution switches off. Power is no longer supplied to
the traffic controller load.
When mains power is restored at the site supply feeder pillar, the UPS
solution will automatically switch to 'RETRAN' mode.
Table 12-1: Key UPS Solution Operating Modes
Page 45 of 76
TS008468
Infrastructure and Mobility, Traffic Solutions
Description
Status
ISSUED
Date
31/01/2017
Doc. No.
667/HB/47750/000
Sopers Lane, Poole, Dorset
BH17 7ER
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