Troubleshooting; Plc Version Number Check; Wiring Check; Special Device Check - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD-TC-ADP (4-channel Thermocouple Data Input)
3U
5.

Troubleshooting

This chapter describes the troubleshooting methods and error status.
If the temperature measurement data is not input, or if the proper digital value is not input, check the following
items:
• Version number of the PLC
• Wiring
• Special devices
• Programs
• Error status
5.1

PLC Version Number Check

• Any versions (from Ver. 1.00 (initial version) to the latest version) of the FX
• Any versions (from Ver. 1.00 (initial version) to the latest version) of the FX
• Any versions (from Ver. 1.40 (initial version) to the latest version) of the FX
• Any versions (from Ver. 2.20 (initial version) to the latest version) of the FX
• Check the version number of FX
5.2

Wiring Check

Check the following items for wiring:
1. Power
The TC-ADP needs driving power. Verify that the power supply line is properly connected. Also check that the
POWER indicator lamp of the TC-ADP is on.
2. Thermocouple cable
Use a non-grounded type thermocouple and connect the thermocouple using the compensating lead wire.
In addition, separate the cable of the thermocouple from the other power cables or inductive cables.
3. To use thermocouple type J
To use thermocouple type J, shortcircuit the J-type terminals. If these terminals are not shortcircuited, the
temperature measurement data cannot be read out correctly.
5.3

Special Device Check

Check whether the special devices for the TC-ADP are correctly used:
1. Selection of type K or J
Check if the special device for type K/J selection is correctly set.
Turn off the device to select thermocouple type K. Turn on the device to select thermocouple type J.
2. Temperature measurement
Check if the special device of the selected channel is correctly set.
This special device should be selected depending on the connecting position and the channel.
3. Averaging time
Verify if the set averaging time is within the specified range. The averaging time should be set in the range
from 1 to 4095. If the set averaging time is outside the specified range, an error occurs.
4. Error status
Check that no error is detected in the TC-ADP.
If an error is detected, check the details of the error, and then check the wiring and programs.
L-30
PLC User's Manual - Analog Control Edition
3UC
Series. The version number should be 1.30 or later.
3UC
→ For a detailed description of special devices, refer to Chapter 4.
→ For a detailed description of the version check method,
refer to A. Common Items Subsection 5.1.2.
→ For a detailed description of wiring, refer to Chapter 3.
5 Troubleshooting
5.1 PLC Version Number Check
Series are compatible.
3S
Series are compatible.
3G
Series are compatible.
3GC
Series are compatible.
3U