SDV-SH5 Omron, SDV-SH5 Datasheet - Page 16

• Manufacturer Part Number: SDV-SH5
• Description: Sensor Hardware & Accessories SHUNT 5A
• Manufacturer: Omron

Specifications of SDV-SH5

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

up lock time is too long and an accident due to overcurrent occurs at
the start of operation, the trip signal will not be output until the start-
up lock time has elapsed, possibly resulting in motor burnout.
2) Open-phase Circuit
Open-phase Level Detecting Circuit
This circuit detects when the current reaches the open-phase operat-
ing level (85% max. of the set current value). Therefore, open-phase
is not detected until the maximum phase of the current exceeds 85%
of the set current value.
Open-phase Detecting Circuit
Output of the maximum value detecting circuit is divided and used as
reference values for comparison with the output of the rectifier/
smoothing circuits for the respective phases. If a phase has a value
lower than the reference value, the K2CM judges it to be open-phase
and outputs an open-phase signal.
The following imbalance factors can be selected by setting the open-
phase switch.
“High” . . .Operating imbalance factor: 35 10%
“Low” . . .Operating imbalance factor: 60% min.
The imbalance factor can be easily obtained from the following
graph. In the graph, the horizontal axis indicates the maximum phase
of the current whereas the two vertical axes indicate the remaining
two phases. The maximum phase of the current is taken to be 1.0 as
a reference point. The imbalance factor is obtained as a percentage
from the curve around the center of the graph. Obtain the imbalance
factor for a motor current with I
follows:
1. On the R axis, locate point A, where I
2. Move from point A to point B, where I
3. On the T axis, locate point C, where I
4. Follow the curves that pass through points B and C and locate the
5. Locating the point corresponding to point D on the imbalance fac-
14
current
Motor
Operation
mode
Output
tc: Start-up lock time
**: Instantaneous operation enabled
intersection point D.
tor curve gives an imbalance factor of 35%. Take the maximum
phase of current on the horizontal axis without considering axes
R, S, and T.
Start
A
tc
*
B
Motor Protective Relay
Start
C
**
tc
D
*: Fixed time-limit operation
*
R
= 100 A, I
E
S
T
R
Start
= 0.7 on the S axis.
= 0.6.
F
= 1.0.
S
K2CM
= 70 A, and I
tc
**
G
*
Trip
T
H
= 60 A as
Overcurrent
operating value
Start-up
operating value
Generally, in open-phase detection, detecting a complete open-
phase is sufficient. In such a case, set the open-phase switch to the
“Low” position. If using the motor in an imbalanced condition causes
problems, or when detecting internal open-phases of a delta-con-
nected motor, set the switch to the “High” position. Depending on the
motor’s load condition and the imbalance of the power supply, how-
ever, special consideration may be required for the detection of inter-
nal open-phases in delta-connected motors. Consult your OMRON
representative before using this method. When a transformer is con-
nected as a load, the harmonics increase at low loads. Therefore, in
such a case, set the open-phase switch to the “Low” position.
3) Reverse-phase Circuit
1. Current Reverse-phase Detection Models
Reverse-phase Level Detecting Circuit
This circuit detects when the current reaches the reverse-phase
operating level (50% max. of the set current value). This circuit also
functions as the gate of the reverse-phase signal.
T phase
1.0
0.5
T (R, S) 0.8
Point C
0
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0
"Low"
0.1
0.2
Open-phase
B
0.5
"High"
switch
0.3
Point D
0.4
current: R phase = 1.0
R (S, T)
30.0
15.0
20.0
25.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
Non-operating
10.0
Maximum phase of
75.0
80.0
85.0
90.0
95.0
5.0
0.5
area
0.6
S phase
0.7
1.0
A
25%
35%
60%
0.8
0.9
1.0
"High"
operating
area
"Low"
operating
area
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8 S (T, R)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Point A
Point B