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16
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WIRING PROCEDURE
1.
Open the STS cabinet front door and remove the metal guard on the lower side to permit access to the
connection terminals and busbars (neutral and earth). Before connecting any power cables, please ensure
that all the circuit breakers on the STS are in “OFF” position. (S1, S2, S3 and S4)
SOURCE 1 Input Power Connections
2.
Connect the SOURCE 1 AC power cables to the terminals U1-V1-W1 of the STS (Figure 7,8,9,10) and
tighten the connections properly.
The neutral cable must be connected to the copper bus-bar identified as “NEUTRAL”.
CHECK FOR CORRECT PHASE ROTATION
SOURCE 2 Input Power Connections
3.
Connect the SOURCE 2 AC power cables to the terminals U2-V2-W2 of the STS (Figure 7,8,9,10) and
tighten the connections properly.
The neutral cable must be connected to the copper bus-bar identified as “NEUTRAL”.
CHECK FOR CORRECT PHASE ROTATION
Output Connections
4.
Connect the output cables to the terminals (U-V-W) of the STS (Figure 7,8,9,10) and tighten the connections
properly.
The output neutral cable must also be connected to the copper bus-bar identified as “NEUTRAL”.
CHECK THAT PHASES ARE CONNECTED IN THE RIGHT ORDER.
CHECK AGAIN ! that U1-U2, V1-V2 and W1-W2 are the corresponding phases of the two separate AC input
sources respectively.
5.
Also proper control and signal wire connections (Alarm relays, EPO etc.) should be made through the screw
terminal block shown in figure 11.
Note :
These auxiliary cables must be shielded and double insulated.
(Recommended cross-section 1mm
2
)
6.
Reassemble the metal guard removed previously.
PROTECTIVE EARTH
The protective earth cable must be connected to the earth BUS BAR and bonded to each cabinets in the system
and also the earthing and neutral bonding arrangements must be in accordance with the local laws. Proper
grounding considerably reduces problems in systems caused by electromagnetic interference.
ATTENTION!!!
Failure to follow adequate earthing procedures can result in electric shock
hazard to personnel, or the risk of fire
EMERGENCY POWER OFF
This isolated input is used to turn off the STS remotely in case of emergency.
The STS is supplied from the factory with the “Emergency Power Off ” (E.P.O.) terminals open-circuited ( see
“View of the STS connections”) if two (NO) terminals are shorted to each other STS shutdown the output
voltage.
In case of emergency ,by activating the stop device STS enters to stand-by mode and powers off the load
completely.
The E.P.O. circuit is self-powered ,no external power supply voltage is therefore required. If E.P.0. switch
pressed (at least 1 second) STS trips the signal.
Summary of Contents for InfoSTS
Page 45: ...44 Figure 28...
Page 47: ...NOTES...