Mitsubishi Q64AD-GH User Manual page 79

4 SETUP AND PROCEDURES BEFORE OPERATION
(4 to 20mA)
+
2-wire
-
transmitter
*1 Shielded
*1 Use a 2-core twisted shielded wire for the power wire.
*2 Shows input resistance.
*3 To connect with the 2-wire transmitter, be sure to connect to P and I/CHK+.
*4 Always use a ground. In addition, ground the FG of the power supply module.
*5 The check terminals (I/CHK+, CHK-) are used to check the amount of input
in mA in relation to the 2-wire transmitter output.
This can be checked since analog inputs of 4 to 20mA are converted to analog outputs of 1 to 5V.
The relationship of this conversion can be expressed by the following formula:
Analog output (V) =
4 - 7
(2) Q62AD-DGH
*3
V+
V
V-
DC24V
*4
Analog input (mA)
1000
IMPORTANT
Q62AD-DGH needs to powered on 30 minutes prior to operation for compliance to
the specification (accuracy).
Therefore, power on 30 minutes prior to offset/gain setting or after online module
change.
Current
P
limiting circuit
I/CHK+
250
CHK-
*5
24V
Filter
24G
FG
250
MELSEC-Q
*2
24V
Transmitter
power supply
24G
Insulating
circuit
24V
24G
4 - 7