Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
L-29
5 Troubleshooting
5.1 PLC Version Number Check
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4AD-TC-ADP (4-channel Thermocouple Data Input)
K
FX
3U
-4A
D
D
-P
NK
-A
D
P
L
FX
3U
-4AD
-TC
-
A
D
P
M
PI
D
In
st
ru
ctio
n
(F
N
C
88
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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
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.2.20 (initial version) to the latest version) of the FX
3U
Series are compatible.
• Check the version number of FX
3UC
Series. The version number should be 1.30 or later.
• Any versions (from Ver.1.00 (initial version) to the latest version) of the FX
3G
Series are compatible.
→ For a detailed description of the version number check method, refer to Section 1.3.
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.
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.
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.
temperature measurement data cannot be read out correctly.
→ For a detailed description of wiring, refer to Chapter 3.
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.
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.
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.
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.
If an error is detected, check the details of the error, and then check the wiring and programs.
→ For a detailed description of special devices, refer to Chapter 4.