Wiring Example Of 3P4W Connection - Omron K7DD User Manual

2 Procedures

Wiring Example of 3P4W Connection

1.
Install wiring between the
monitored 3-phase power
line and the K7DD by
referring to the figure.
2.
Connect the
communications cables of
the communications
converter to the terminal
numbers 3 (+) and 4 (-) of
the RS-485 (a).
The CT input terminals have polarities (k and ℓ). Refer to
The active power in case of incorrect wiring is as follows.
One phase (k, ℓ) is opposite.
Two phases (k, ℓ) are opposite.
Three phases (k, ℓ) are opposite.
(Phase-S on terminals I and J, Phase-R on
2 - 8
Communications converter
CT wiring state
Normal
Incorrect connection phase
terminal)
Computer
(K7DD Support Tool)
+
RS-485
1
+
(Modbus RTU)
3
Communication (1)
4
-
K7DD
+
5
RS-485
6
-
Communication (2)
External contact
Trigger signal
7
8
Critical level
25
Alarm output 1
26
Warning level
27
Alarm output 2
28
29
Output at Error
30
3-4 I/O Wiring (P.3-8) for details.
Change from normal state
---
The value becomes 1/3.
The negative value of 1/3 value
Negative value of normal value
Near 0 [kW]
Power Line Data Generator User's Manual (N233)
N R S
-
3-phase,
MC
4-wire type
2
13
R
14
S
15 T
16 N
k
19
R
20
ℓ
k
21
S
22
ℓ
k
23
T
24
ℓ
M
Example) Active
power value [kW]
100
33
-33
-100
0
T