Mitsubishi Electric FX3G User Manual page 450

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD-PNK-ADP (4-channel Resistance Thermometer Data Input)
3U
3.4 Selection of the Resistance Thermometer Sensor
Select the Pt1000/Ni1000 (2-wire or 3-wire sensors) resistance thermometer sensor.
3.5 Wiring of the Resistance Thermometer Sensor
Wiring depends on the resistance thermometer sensor type selected. Refer to the following wiring diagrams:
*1. For FX
3S
available.
*2. When using a 2-wire temperature sensor type, short-circuit the [L -] terminal and the [I -] terminal.
For the lead wire use a 10 Ω resistance or less per line.
*3. Separate the cable of the platinum resistance thermometer sensor from the other power cables or
areas easily affected by inductive noise (of the commercial power, etc.).
3.6 Caution Regarding Wiring
• It is not possible to connect different types of resistance thermometer to 4 channels of PNK-ADP. Be sure
to use the same type of resistance thermometer for all the channels.
3.7 Grounding
Grounding should be performed as stated below.
• The grounding resistance should be 100 Ω or less.
• Independent grounding should be performed for best results.
When independent grounding is not performed, perform "shared grounding" as shown in the following
figure.
PLC
equipment
Independent grounding
Best condition
• The grounding wire size should be AWG22 to 20 (0.3 to 0.5 mm
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
K-16
PLC User's Manual - Analog Control Edition
3UC
Resistance thermometer
wiring
3-wire
sensors Terminal
*3
Shield wire
type
2-wire
sensors
type
*2
External power supply
wiring
*1
24V DC
Class-D grounding
L+, L-, I-, ch:  represents the channel number.
/FX /FX Series PLC (AC power type), the 24 V DC service power supply is also
3G 3U
→ For details, refer to the User's Manual - Hardware Edition of the each PLC Series.
Other Other
PLC
equipment
Shared grounding
Good condition
PNK-ADP
+5V
47k 47k
block
ch
1M
L+
L-
1M
I-
+5V
47k 47k
1M
ch
L+
L-
1M
I-
24+
24-
Other
PLC
equipment
Common grounding
Not allowed
3.4 Selection of the Resistance Thermometer Sensor
+5V
2
).
3 Wiring