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AMATRONIC
E
LECTRONIC
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NDUSTRIES
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CENTRIC 3x480, User Guide, rel. 1.7
45
7.2.5.5
SETUP > ST.SW. > HIGH-LEVEL SETUP
These functions are related to the static switch.
7.2.5.5.1
S
ETUP
>
ST.SW.
>
H
I
-
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.
Choose "Forced" if you want the UPS to move to bypass regardless of the quality of the bypass voltage.
Choose "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
7.2.5.5.2
S
ETUP
>
ST.SW
>
H
I
-
LEVEL SETUP
>
ST.SW.
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.
7.2.5.5.3
S
ETUP
>
ST.SW.
>
H
I
-
LEVEL SETUP
>
ST.SW.
SYNCHRONIZATION
SENSITIVITY
The UPS prevents transfers from inverter to bypass if there is a significant difference between the inverter
output voltage and the bypass voltage. This option lets you control the degree of sensitivity of the UPS to
such a voltage difference. The options are:
"Regular" sensitivity means that the UPS will not move to bypass when the voltage difference is greater
than 20 V.
"Extended" sensitivity means the UPS will not move to bypass when the voltage difference is greater than
30 V.
7.2.5.5.4
S
ETUP
>
ST.SW.
>
H
I
-
LEVEL SETUP
>BYPASS
VOLTAGE
RANGE
This option relates to the "Forced / Controlled Bypass" option described in section
7.2.5.5.1 above. When
"Controlled Bypass" is in effect, this option determines if the voltage range criterion used to determine an
acceptable bypass voltage is "wide" (187 – 265 Vac) or "narrow"
(207 – 253 Vac).
7.2.5.6
SETUP > ST.SW. > 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.
This helps avoid a repeated transfer of the load back and forth between the inverter and bypass in a
situation where the UPS is operating under near-overload conditions.
The factory default setting of 85 % is recommended for most environments.
