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4 SETUP AND PROCEDURE BEFORE STARTING THE OPERATION
4.4.3 Heater disconnection detection wiring and setting example for use of three-phase
heater
4 - 11
The following wiring and setting example given below is designed to detect a three-
phase heater disconnection using the heater disconnection detection function.
To three-phase heater (used in CH2 loop)
To single-phase heater (used in CH3 loop)
To single-phase heater (used in CH4 loop)
Three-phase hater disconnection detection is made by measuring the currents of two
of the three conductors.
In the above wiring example, make CT input channel assignment setting (buffer
memory: 108
to 10F
H
H
CT input
CT1
CT2
CT3
CT4
CT5
CT6
CT7
CT8
R
Controlled
object
Unused
) as indicated below.
Buffer memory address
108
H
109
H
10A
H
10B
H
10C
H
10D
H
10E
H
10F
H
MELSEC-Q
Q64TCTTBW
L1
L2
L3
L4
COM-
CH1
CH2
CH3
CH4
CT1+
CT1-
CT2+
CT2-
CT3+
CT3-
CT4+
CT4-
CT5+
CT5-
CT6+
CT6-
CT7+
CT7-
CT8+
CT8-
Set value
1
1
2
2
3
4
0
0
4 - 11
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