14
Problem
V. Simple Troubleshooting
No display after adding control
power
Power failed to join the device
Incorrect voltage measurement
Incorrect current measurement
Incorrect power measurement
Switching voltage
No control command received
Incorrect relay operation mode
The measurement value is
incorrect or does not meet
expectations
Switch status does not change
Relay does not operate
The upper end cannot
communicate with the device
Device communication address is incorrect
Device communication rate is incorrect
Communication link is not connected to terminating
resistor
Communication link is disturbed
Communication line interruption
Check whether the correct operating voltage is added to the L/+ and N/- terminals of the device
Check if control power fuse is burned
Check if the neutral connection is reliable
Check whether the measured voltage matches the rated parameter of the equipment
Check if the PT ratio parameter setting is correct
Check whether the measured current matches the rated parameter of the device
Check CT ratio parameter setting is correct
Check the measurement mode setting is correct
Check the voltage and current phase sequence is correct
Check the current name is wrong
Check whether the external node type matches the device's rated parameters
Check the external wiring is correct
Check the communication link is correct
Check current relay is in correct mode
Check whether the device address is consistent with the definition
Check whether the device communication rate is consistent with the definition
Check whether the 120 ohm resistor is added
Check that the communication shield is well grounded
Check the communication cable is disconnected
Reason
Solution
Parameter
Switch output (low alarm) code
transmission output
(
4-20mA
)
code
4.9 Alarm output and transmission output parameter
Switch output (high alarm) code
Ua(A phase voltage)
Ub(B phase voltage)
1
3
1
2
2
4
EP
(
total active power)
EQ
(
total reactive power)
unbalance
unbalance
30
31
57
59
61
58
60
62
F frequency
29
(
FL
)
(
EPL
)
(
EQL
)
(
FH
)
(
EPH
)
(
EQH
)
(
F
)
(
EP
)
(
EQ
)
0 wire current
32
63
64
(
InL
)
(
InH
)
(
In
)
0
(
no
)
65
67
66
68
(
UNNB
)
(
INNB
)
(
ULNB
)
(
PNNB
)
(
UaL
)
(
UbL
)
(
UaH
)
(
UbH
)
(
Ua
)
(
Ub
)
53
55
54
56
PFc(C phase power factor)
PF(total power factor)
27
28
(
PFcL
)
(
PFL
)
(
PFcH
)
(
PFH
)
(
PFc
)
(
PFs
)
Uc(C phase voltage)
U( phase voltage of A, B or C)
I(phase current of A
、
B
、
C)
UL(wire voltage of AB
、
BC
、
CA )
Uab(AB wire voltage)
Ubc(BC wire voltage)
Uca(CA wire voltage)
Ia(A wire current)
Ib(B wire current)
Ic(C wire current)
Pa(A phase active power)
Pb(B phase active power)
Pc(C phase active power)
P(total active power)
Qa(A phase reactive power)
11
12
14
16
18
20
12
13
14
15
16
17
5
7
9
11
13
15
17
19
22
24
26
28
30
32
34
3
4
5
6
6
7
8
8
9
10
10
21
23
25
27
29
31
33
(
UbcH
)
(
UcaH
)
(
ULH
)
(
IaH
)
(
IbH
)
(
UbcL
)
(
UcaL
)
(
ULL
)
(
IaL
)
(
IbL
)
(
IcL
)
(
IL
)
(
PaL
)
(
PbL
)
(
PcL
)
(
PL
)
(
QaL
)
(
IcH
)
(
IH
)
(
PaH
)
(
PbH
)
(
PcH
)
(
PH
)
(
QaH
)
PFb(B phase power factor)
51
52
26
Qb(B phase reactive power)
Qc(C phase reactive power)
Q(total reactive power)
Sa(A phase apparent power)
Sb(B phase apparent power)
Sc(C phase apparent power)
S( total apparent power)
PFa(A phase power factor)
18
19
20
21
22
23
24
25
36
38
40
42
44
46
48
50
35
37
39
41
43
45
47
49
(
QbL
)
(
QcL
)
(
QL
)
(
SaL
)
(
SbL
)
(
ScL
)
(
SL
)
(
PFaL
)
(
PFbL
)
(
QbH
)
(
QcH
)
(
QH
)
(
SaH
)
(
SbH
)
(
ScH
)
(
SH
)
(
PFaH
)
(
PFbH
)
(
Qb
)
(
Qc
)
(
Qs
)
(
Sa
)
(
Sb
)
(
Sc
)
(
Ss
)
(
PFa
)
(
PFb
)
(
UcL
)
(
UL
)
(
UabL
)
(
UcH
)
(
UH
)
(
UabH
)
(
Ubc
)
(
Uca
)
(
no
)
(
Ia
)
(
Ib
)
(
Ic
)
(
no
)
(
Pa
)
(
Pb
)
(
Pc
)
(
Ps
)
(
Qa
)
(
Uc
)
(
no
)
(
Uab
)