Mitsubishi FX3U-?*MR/ES User Manual page 5

3. WIRING PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting installation or
wiring work.
Failure to do so may cause electric shock or damage to the product.
• Make sure to attach the terminal cover, offered as an accessory, before turning on the power or
initiating operation after installation or wiring work.
Failure to do so may cause electric shock.
• Do not supply power to the [24+] and [24V] terminals (24V DC service power supply) on the main
unit or extension units.
Doing so may cause damage to the product.
• Perform class D grounding (grounding resistance: 100 Ω or less) to the grounding terminal on the
main unit and extension units with a wire 2 mm
Do not use common grounding with heavy electrical systems (refer to Section 9.4).
• Connect the AC power supply wiring to the dedicated terminals described in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the
PLC will burn out.
• Connect the DC power supply wiring to the dedicated terminals described in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the
PLC will burn out.
• Do not wire vacant terminals externally.
Doing so may damage the product.
• When drilling screw holes or wiring, make sure that cutting and wiring debris do not enter the
ventilation slits.
Failure to do so may cause fire, equipment failures or malfunctions.
• Make sure to properly wire the FX
equipment in accordance with the following precautions.
Failure to do so may cause electric shock, equipment failures, a short-circuit, wire breakage,
malfunctions, or damage to the product.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
• Make sure to properly wire to the terminal block (European type) in accordance with the following
precautions.
Failure to do so may cause electric shock, equipment failures, a short-circuit, wire breakage,
malfunctions, or damage to the product.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
- Twist the end of strand wire and make sure that there are no loose wires.
- Do not solder-plate the electric wire ends.
- Do not connect more than the specified number of wires or electric wires of unspecified size.
- Affix the electric wires so that neither the terminal block nor the connected parts are directly
stressed.
• Make sure to properly wire to the FX Series terminal blocks in accordance with the following
precautions.
Failure to do so may cause electric shock, equipment failures, a short-circuit, wire breakage,
malfunctions, or damage to the product.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
Safety Precautions
(Read these precautions before use.)
2
or thicker.
Series main unit and FX
3U
(3)
/FX /FX Series extension
0N 2N 3U
Reference
142
166
169
173
186
229
249
291
314
440
Reference
143
167
169
173
187
230
235
243
244
248
250
292
314
440
449