Mitsubishi Electric Melsec iQ-R Series User Manual page 33

Instantaneous power failure
If an instantaneous power failure occurs, the system operates continuously, or goes to stop operation or restart the system,
depending on the duration of power failure. Do not use the system in the environment where an instantaneous power failure
occurs.
Grounding
Ground the FG terminals when substantial noise effects are present.
While there is adequate noise resistance in a normal environment, use the grounding process for environments with
particularly loud noise.
■Grounding process
• Use a power cable of 1.5 or more, with a ground resistance of 100 or less.
• Keep the grounding point as close to the control module as possible, to shorten the ground wire distance.
• Provide independent grounding in any cases. Sharing the grounding with other devices may produce an opposite effect.
• The sensor head case and sensor head cable connector housing are electrically connected via the sensor head cable to
the FG terminal of the control module.
(1)
Control
Equipment
module
Ground
resistance of
100Ω or less
(1) Independent grounding
(2) Shared grounding
(3) Common grounding
Connecting
■Wire connections and connectors
• Turn off the power of the programmable controller and external power supply before connecting or disconnecting the
connectors and any other connections.
• When connecting or disconnecting the sensor head, be sure to hold the connector body of the sensor head cable and not to
apply extra force to the cable.
• Be careful not to touch the terminals of disconnected connectors or to let foreign objects get in disconnected connectors.
• Be careful not to apply force to around the connectors of sensor head cable and extension cable for sensor head. Do not
bend the cables near connectors of sensor head cable and extension cable for sensor head. Doing so causes
disconnection of the cables.
• Fit the connector of the sensor head cable to the plug-in side of the connector. ( Page 35 Connecting sensor head to
control module)
(2)
Control
Equipment
module
Ground
resistance of
100Ω or less
(3)
Control
Equipment
module
6 INSTALLATION AND WIRING
31
6.1 Correct Usage
6