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UPS for 400 Vac Grid, User Guide, doc. rev. 4
8.2.4.3.1.
Setup > STSW > Hi-level setup > Bypass forced/controlled
When the UPS wants to move to bypass mode, this function determines whether the controller
will check the quality of the bypass voltage or not, before moving to bypass.
Select Forced if you want the UPS to move to bypass regardless of the quality of the bypass
voltage.
Select Controlled if you want the UPS to determine if the bypass voltage is acceptable before
transferring to bypass. In this case, if the bypass voltage is not acceptable, the UPS remains in
inverter mode. The range of what is an "acceptable" bypass voltage can be set to wide or
narrow.
See Section 8.2.4.3.3 below.
8.2.4.3.2.
Setup > STSW > Hi-level setup > STSW integration time
This option controls the amount of time the static switch waits before transferring the load to
bypass after detecting that the inverter output voltage is out of range. The "normal" setting is 3
ms, the "extended" setting is 20 ms.
8.2.4.3.3.
Setup > STSW > Hi-level setup > Bypass voltage range
This option relates to the "Forced / Controlled Bypass" option described in Section 8.2.4.3.1
above. When "Controlled Bypass" is in effect, this option determines if the voltage range criterion
used to determine an acceptable bypass voltage is "wide" (appx. 195 ~ 264 V) or "narrow" (appx.
207 ~ 253 V).
8.2.4.4.
Setup > STSW > Overload hysterisis
This option sets the load level at which the load returns to the inverter after being transferred to
bypass due to an overload. The return of the load to the inverter is blocked until the load level
has decreased to this user-specified level.
