FujiFilm Frenic-Mini Instruction Manual page 37

- Since weak analog signals are handled, these signals are especially susceptible to
the external noise effects. Route the wiring as short as possible (within 20 m) and use
shielded wires. In principle, ground the shielding layer of the shielded wires; if effects
of external inductive noises are considerable, connection to terminal [11] may be ef-
fective. As shown in Figure 2.13, ground the single end of the shield to enhance the
shielding effect.
- Use a twin contact relay for weak signals if the relay is used in the circuit. Do not con-
nect the relay's contact to terminal [11].
- When the inverter is connected to an external device outputting the analog signal, a
malfunction may be caused by electric noise generated by the inverter. If this hap-
pens, according to the circumstances, connect a ferrite core (a toroidal core or an
equivalent) to the device outputting the analog signal and/or connect a capacitor
having the good cut-off characteristics for high frequency between control signal wires
as shown in Figure 2.14.
- Do not apply 7.5 V or higher to terminal [C1] continuously. Doing so could damage
the internal control circuit.
Figure 2.13 Connection of Shielded Wire Figure 2.14 Example of Electric Noise Prevention
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