Option

Switch #2

Option

Switch #3

Undervoltage

Transfer

Down (OFF)

Down (OFF)

196 Vac

Up (ON)

Down (OFF)

184 Vac

Down (OFF)

Up (ON)

172 Vac

Up (ON)

Up (ON)

160 Vac

5.4.3 Option Switch #4

Option switch #4 sets the internal operating frequency of the inverter. It should be set to match the local line frequency. When in the down (off) position, the UPS will operate properly with a 50 Hz line. If your local line frequency is 60 Hz, set the option switch #4 in the up (On) position.

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APC BK600EI, BK400EI, BK250EI user manual Option Switch #2 Switch #3 Undervoltage Transfer, Option Switch #4