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17
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USE
DESCRIPTION
The purpose of the STS is to select one of two input power lines which is in tolerant with predefined limits.
Users must decide that one of the input sources must have priority (preferred source) the other source is
alternate source. So the STS tries to stay at priority (preferred) source if this source in tolerant with predefined
values, if this source out of tolerant and the alternate source is in tolerant STS transfers the load to alternate
source. Always STS checks priority (preferred) source if it is in tolerant retransfers the load to priority (preferred)
source.
So before use the STS we must decide that which source is main (preferred) and which source is spare
(alternate).
IMPORTANT :
Our STS are designed and produced for long life even under severest conditions. Remember
however that they are electrical power equipment items and as such are in need of periodic checks. Besides,
some components have a life cycle of their own and must therefore be checked at regular intervals and may
need to be replaced, where due to the conditions: in particular fans and some electrolytic capacitors.
It is recommended to implement a preventive maintenance program, using manufacturer authorized and trained
service personnel.
Our Technical Servicing department is at your disposal to discuss the different personalized preventive
maintenance options with you.
PRELIMINARY OPERATIONS
•
Visual check of the connections
Check that all the connections have been made strictly following the indications given in the
“Connections” paragraph.
•
Check that the following switch positions
S1 – input 1 MCCB 0 position (off)
S2 – input 2 MCCB 0 position (off)
S3 – output switch 0 position (off)
S4 – maintenance bypass switch 0 position (center)
Manual transfer switch auto position (center)
At this point there is no output voltage at the STS output terminals
POWERING ON FOR THE FIRST TIME
•
Turn on input 1 power at external input power distribution box (apply power to input 1 terminals) . Measure
the voltages on terminals. (according to your local electricity nominals)
Phase to phase 400 volts AC ,Phase to neutral 230 volts AC.
•
Turn on input 2 power at external input power distribution box (apply power to input 2 terminals) . Measure
the voltages on terminals. (according to your local electricity nominals)
Phase to phase 400 volts AC ,Phase to neutral 230 volts AC.
•
Optional : If sources are synchronous to each other, Check that the phase sequency is matched between
two input sources (method: measure L1 phase to phase voltage between two sources, repeat this
measurement for L2 and L3 phases if the measured AC voltages is minimum the phases of two input
sources are matched.)
•
Turn on S1 (1 position) wait and see the STS control panel activated and shows some messages (source 2
BAD ,output switch off messages are normal)
•
Turn on S2 (1 position) wait and see only output switch off message is showed on the control panel.
•
At this point according to your application you must select some user options from OPTIONS MENU of the
control panel. You need password to change options. The factory default password is “0000” 4 zeros ,you
can change the factory password after you logged in.(STS front panel functions)
•
After you setup some options you can turn on S3 output switch (1 position)
•
See that there is no alarm message or alarm sound on the STS
Summary of Contents for InfoSTS
Page 45: ...44 Figure 28...
Page 47: ...NOTES...