Chapter 5 Wire Connection
5-4-2
Cautions for wiring control circuit terminals
● Risk of electric shock and damage to the inverter!
[L] terminal and [CM2] terminal are common terminals for input and output
signals. They are isolated from each other.
Do not short-circuit or ground these common terminals.
Also, do not ground them through external devices. (Check the grounding
condition of the external devices.)
Do not short-circuit between [H] terminal (10 VDC power supply) and [L]
terminal, [P24] terminal (24 VDC power supply) and [L] terminal.
● Risk of damage to the inverter!
Switching the DIP switch on the PCB while the power is on may cause a failure.
Turn off the power, check that Power LED [PWR] on the keypad is off, and then
switch.
Difference of the switch status and the actual input/output specifications may
cause a failure. Be sure to check that the characteristics of the input/output
and the switch are correct.
When connecting a relay to the intelligent output terminal, connect a diode for
surge absorption in parallel with the coil. Surge-voltage at switching the relay
may cause a failure of the internal circuit.
By supplying external 24 VDC to [P24] terminal, it is possible to operate only
the control board and parameters can be read/written. When an external
power supply is connected, be sure to connect a reverse current prevention
diode. Also, be careful not to shut off the external power supply when writing
parameters in this state.
● Risk of malfunction of the inverter!
Separate the wiring to the control circuit terminal block from the wiring of the
main circuit line (power line) or relay control circuit. If it is unavoidable to do
so, make them positioned at right angles to each other.
For wiring to the control circuit terminal block, use twisted shield wires, and
connect the shield films to each common terminal.
The wiring length to the control circuit terminal block shall be within 20 m. If
the connecting wire exceeds 20 m, sufficient characteristics may not be
obtained due to the effects of voltage drop. If it is unavoidable to set the length
to more than 20 m, use an analog insulation signal converter, and check that
there is no problem with operation.
For wiring to "External thermistor [PTC]", twist it together with [L] common
wires individually, and separate it from the other [L] common wires. Since the
power supply flowing through the thermistor is a weak current, separate it from
the power line. The wiring length to the thermistor should be within 20 m.
When connecting contacts to the control circuit terminals, use crossbar twin
contacts, etc. that do not easily cause contact failure even with a weak
current/voltage.
After wiring, pull the wire lightly to check that it is securely connected.
To Next Page
Loading...
Need help?
General