Mitsubishi Electric MELDAS 600M Series Instruction Manual page 441

(6) Remote I/O-related problems
The communication alarm LED RAL is lit.
The remote connection
cable is not connected. Or,
the cable has a broken wire
or a faulty contact in the
connector.
The HR3
defective.
The power supply system LED goes out.
The 24IN LED goes out.
(Input voltage not supplied.)
The 5OUT LED goes out.
(Input voltage outside the
allowable range, internal
power supply fault)
(7) Others
Check the following.
• Is the mode selected correctly?
• For tape operation, is the tape correctly mounted?
• Are the starting conditions satisfied?
• Are the override and manual speed set to "0"?
• Has a reset signal been issued?
• Has a feed hold signal been issued?
• Is the machine lock ON?
Downloaded from ManualsNet.com
Cause
Card is
Cause
(Depending on the machine, the start may be locked until the specified conditions are
satisfied. Check with the instruction manual issued by the machine manufacturer.)
CAUTION
Do not apply voltages on the connector other than those indicated in this manual. Doing so
may lead to destruction or damage.
Incorrect connections may damage the devices, so connect the cables to the specified
connectors.
Do not connect or disconnect the connection cables between each unit while the power is ON.
Do not connect or disconnect any PCB while the power is ON.
search engine
CHAPTER 3 MAINTENANCE
8. Fault Diagnosis and Action
Check the NC control section and remote connection F010 cable,
or the connection of the SH41 cable between remote I/O units.
Contact the nearest service center, and replace the card.
Supply a voltage of + 24V ± 5% to the HR3
Check whether the input voltage is + 20V or less. If the correct
voltage is being supplied, contact the nearest service center.
III – 55
Remedy
Remedy
Card.