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2
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During normal operation, “PREFERRED” network supplies the load when both inputs are available. Selection of
the “PREFERRED” network, automatic re-transfer, retransfer delay, overload behavior of STS, alarm hold time,
nonsynchronized transfer behavior, overload and transfer inhibit reset modes may be set by the user on the
control panel of the unit.
Permitted voltage, phase difference and frequency tolerance are also adjustable by the service personnel on the
control panel.
Basic Features:
•
Easy monitoring all parameters on LCD display
•
Fast microcontroller (32 mips)
•
Advanced RS232 communication features ,optional TCP/IP connection
•
DRY contact alarm interface
•
Password protected login system from remote site (timed Access)
•
2 redundant power supplies for electronic boards (hot swappable)
•
Easy front access to all components inside of the STS
•
Second protection cover on live circuits which prevents electrical shock
•
Input sources protected by fuses
•
3 positioned Maintenance bypass switch which prevents cross currents between input sources
•
User adjustable parameters by entering a password.
•
Built in real time clock.
•
Alarm history (with their date and time)
•
Automatic transfer test from a remote site or using front panel
•
Front panel Lamp test
•
External emergency shutdown (EPO) input
•
All boards are supplied by two separate power supplies.
•
Hot plug construction during maintenance bypass
•
High current output tolerant up to 1000%
•
Adjustable long dead time during non synchron transfer up to 3 seconds
•
SCR fault sense circuit
•
Cabinet inside temperature sensor
•
Fast voltage black-out circuit
•
Input phase balance and phase sequence fault detect circuit
•
Output alternance balance sense circuit
•
Adjustable Input source frequency lower/upper limits
•
Additional analog synchronous sense circuit
Control Circuit locations
The control circuits are located in a closed cabinet which is not directly accessible by the user.
Redundant power supply circuit
2 power supplies are installed inside the STS. They are connected to all boards separately. So the construction
is hot swappable. During operation, service personnel can replace one of the power supplies without effecting
the operation of the STS.
Power connections and terminals
All input and output power connections are located at the bottom of STS. At the bottom of the STS separate
panels let to the cables for easy installation.
Easy front Access to all components
All components are installed onto the front side of STS. During servicing, there is no need to remove any side or
rear panel of the STS.
Quick Access to static bypass switch
User can perform static transfer from remote panel but this will take a long time to surf on menu functions. A
separate static bypass switch is installed inside the STS and the priority of this switch is higher than the front
panel controls. This means that, it the user uses the manual bypass switch, all panel bypass commands will be
disabled.
Summary of Contents for InfoSTS
Page 45: ...44 Figure 28...
Page 47: ...NOTES...