Hitachi MICRO-EHV+ Applications Manual page 161

(b) Wiring for the transistor output terminal
1] Flywheel diode
For inductive load, connect a flywheel diode in parallel.
2] V and C terminals
Always connect a V terminal and C (common) terminal. If the module is used without connecting these
terminals, the internal flywheel diode does not function and there is a risk that the module will malfunction
or breakdown.
3] Fuse
A fuse to prevent the external wiring from burning out is not built. So it is recommended to install a fuse for
preventing the external wiring from burning out, but this does not protect internal transistor elements.
Therefore, note that these elements are destroyed when the external load is short-circuited. Please contact us
for repair if the external load short-circuits.
(7) Wiring for the analog I/O terminal
- Do not apply excess voltage to the analog input terminal beyond the rated input voltage. Similarly, do not subject
the terminal to current that exceeds the rated input current. Connecting the analog input terminal to a power
supply other than the specified types may cause damage to the product or burning or its internal components.
- For unused channels of the analog input, short the input terminals before use.
- When wiring the external lines of the analog terminal, route then through the shield cables while separating them
form other power lines or signal lines subject to differential voltage. Shield cables must be grounded on one side.
However, whether it is more effective to ground on one side or leave both sides open, depends on the noise
environment condition in the actual use. Provide appropriate grounding based on the noise environment.
- Use separate piping for the AC power supply line and the signal/data lines.
- Wire the signal lines and data lines as close as possible to the grounded surface of the cabinet or a metal bar.
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Chapter 4 Installation