Modifications reserved Page 35/99
OPM_SPE_XXX_10K_40K_8GB_V020.doc Operating Manual SitePro 10-15-20-30-40 kVA / S8
5.8.3 Functioning as frequency converter
When the UPS is delivered for different output frequency with respect to the input frequency, the
automatic bypass and manual bypass functions are disabled, therefore the load cannot be transferred
to mains in case of overload, short-circuit, or inverter failure.
In cases where the UPS needs to be powered down for maintenance purposes, the critical load must
also be powered down during this time.
When the set-up parameters of the UPS are set for frequency converter, the SEM mode operation is
automatically disabled.
Notices for installation:
• In order to avoid improper operation, only the rectifier input should be powered (L1-1, L2-1 and L3-1),
therefore BR1, BR2 and BR3, on AC input terminals must be removed (see Section 5.8.1).
• Special care must be taken in choosing the fuse ratings installed in the output distribution (max.
20% of the UPS rated current).
Avoid high inrush current due to transformer magnetisation or motor starting.
Notices for start-up operation:
• Since the AC-Power supply is fed from the input mains rectifier (see Section 5.8.2), the control panel
will be powered ON only after closing the input switch Q4.
• The lamp B1 - BYPASS PHASE OK on ”P1 - Power Interface” (see Section 5.8.2) for clockwise phase
rotation check will stay OFF.
• After closing the output switch Q1 the output will not yet be supplied and the LCD screen displays
“Load Off”.
The output bus will be supplied only when the inverter is running and the LCD screen displays “LOAD
ON INVERTER".
Notices for shut-down operation:
• The inverter can be switched OFF pushing the key "O" (Inverter OFF) only after having pushed the key
“Toad Off” (all equipment normally powered by UPS are shut down).
Then follow the normal shut down procedure indicated to Section 8.1.4 or 8.2.6.
WARNING!
Do not allow unattended operation of the inverter with the output switch Q1 open.
This is an abnormal operating mode and some important protective functions are
disabled!
Do not allow the inverter to continue running after the “Load Off” key is activated!
NOTE !
At site only a qualified service engineer may change a unit, initially delivered as a
frequency converter, into a normally operating “standard” UPS.
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