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SANTERNO
USER MANUAL
4.3.2 Terminal Row Below The Interface Board
The lower terminal row is used to connect the status output signal, VFD cable inlet switch interlock signal,
analoginput/output and communication signal. Digital signal XS11T:1-XS13T:8 node capacity is 250VAC/8A (or
250VDC/8A), some are 250VAC/16A (or250VDC/16A). If require more, add intermediate relays to extend capacity.
See Figure 4-6. The analog value input must use shielded wiring, input impedance ≥250Ω, max. input current 30mA
(Max. input voltage 15V); phase lock success signal terminal only used with synchronous transfer switch function.
Close permit and open signal are interlocked with VFD upper level switch (eg.: breakers in the power
cabinet, or VFD input contactors/breakers in the auto bypass cabinet).
● Close permit is NO, connected in series to the close circuit of the upper level switch to form a close
condition, but not participating in the upper level switch operation. When it is close, permit the upper
level switch to close to energize VFD, otherwise, not allowed.
● Open signal is NC, connected in parallel to the open circuit of the upper level switch. When heavy fault
occurs during the VFD running, the contact closes, automatically open the upper level switch to protect
the VFD.
Attention!
Figure 4-6 Terminal row below interface board