Specifications

147
Transducers
Voltage (Rise/Drop) Detectors [Insulated]
T-101VDL
T-101VDL
T-101VDH
0.6kg
0.6kg


Drop
detection
Rise
detection

110V circuit
30~130V

220V circuit
60~260V

110V circuit
90~180V

220V circuit
180~360V
DC
0.3~1.3V
DC
0.6~2.6V
DC
0.9~1.8V
DC
1.8~3.6V
1-phase
or
3-phase
±5%
110VAC
or
220VAC
50 and 60Hz
Consumption
VA
(between lines)
110V: 0.2
220V: 0.4
Method
Voltage crest value
detection method
Method
Detection time
1 cycle
Form
no-voltage 1c
relay contact

Contact capacity
250VAC 3A
30VDC 3A
(resistive load)

Alarm indication lamp
Red LED
110VAC %
50 and 60Hz
Consumption VA: 3
+
10
-15
Outer shape
Box
Model name Function Circuit Rated voltage
Setting range and accuracy Detection
Variable setting range Accuracy
CAL output
Method and detection time Output
Auxiliary power supply Weight
Delivery period
classification
*1 Manufacturable range
Auxiliary power ···100/110/120/200/220/240VAC (voltage tolerance %)
supply
24VDC (voltage tolerance±10%), 100~120VDC (voltage tolerance %)
*2 The detection accuracy is the percentage compared to the rated voltage.
*3 Output indicator lamp···A red lamp lights when the output contact is operating.
*4 Output time

When the drop (or rise) time is 1s or less ··········· 1±0.5s
 When the drop (or rise) time exceeds 1s ············ drop (or rise) time
 For open or reverse phase ································ duration of open or reverse phase
*5 A contact signal is output when the voltage of one phase drops significantly (to
approx. 50% or less of the rated voltage) in a three-phase AC circuit.
*6
Due to the voltage crest value detection method, error may occur when the input waveform is
distorted. Should this happen, calibrate the setting value in accordance with the actual equipment.
*7 A model that operates when abnormal operation lasts for three cycles
can also be manufactured. (Detection time: 40~70ms)
*8 Continuous application of up to 180V is possible for the 110V rating,
and up to 360V is possible for the 220V rating.
*9 Dielectric strength

Between input terminal and contact output terminal: 2000VAC for 1min.
 Between contact output terminal and CAL output terminal: 2000VAC for 1min.
*10 CAL output load resistance: 5kΩ~∞.
*11 Drop detection cannot be performed if the auxiliary voltage drops at the
same time. The auxiliary power supply should thus be taken from a circuit
where voltage drop does not occur.
+
10
-15
+
15
-20
Standard
product
Immediate delivery
 Quasi-standard
product
Within 20 days
Special
product
21 to 60 days
Symbol
Reference delivery period
Delivery period classification
Detection voltage setting (Please carefully read the accompanying instruction manual)
12.5
Alarm indication lamp
Alarm value
setting
Power supply
indicator (lamp)
50
100
100
80
115 130
17.5
12.550
8.8
12
6
R
3
0
0.3
1.1
V
0.6
2.2
1.32.6
V
CAL output CAL output
110 130V30
60 220 260V
Variable setting range
0
0.9
1.1
V
1.8
2.2
1.83.6
V
Drop detection Rise detection
110 180V90
180 220 360V
Variable setting range
Connection diagrams (Refer to p.156 for outer dimensions.)
Fig. 1 T-101VDL (1-phase)
T-101VDH (1-phase)
Fig. 2 T-101VDL (3-phase)
T-101VDH (3-phase)
VT
CO
OUTPUT
Output CAL
Auxiliary power
supply
CA CB
VMA MB±
+
CAL.
–
Load
VT
CO
OUTPUT
Output
Internal contact circuit
CAL
Auxiliary power
supply
CA CB
CO CA CB
M
AP3P2P1 MB
+
CAL.
–
Load
3
2
1
Note 1
Note 1
 Detection – output time example
100ms
drop period
30ms or less30ms or less
10s
drop period
Approx.
10s
t
t
Approx.
1s
(Input)
(Output)
While measuring the output voltage between the (+) and (-)
CAL outputs, set the output to the target value.
Relationship between alarm value and CAL output
Alarm value setting
Example
1
2
(Setting example)
Specification
Drop detection
Rise detection
Rated voltage
110VAC
220VAC
Detection voltage
90VAC
260VAC
CAL output
0.9VDC
2.6VDC
T-51/T-101 Series
Note 1. For low-voltage circuits, grounding of the secondary side of the instrument voltage transformer is unnecessary.
<1-phase/3-phase>
These detectors instantaneously detect a voltage drop (or rise) compared to a previously
set value, an open phase or a reverse phase (only for 3-phase) in 1-phase or 3-phase AC
circuits and output a contact signal.
A “CAL signal” proportional to a preset value is output to enable accurate setting and
checking of the value set.
Applications
Detecting flicker and instantaneous power interruption
Monitoring computer power supply
Detecting open phases, reverse phases (only 3-phase AC circuits)