|
|
 |
| |
 |
|
Frequency
Transducer Type: [STE-A-5T]
STE-A_5T
converts a frequency into an output signal
that can serve several receiving instruments
such as indicators recorders, alarm units
etc. The input voltage signal is stepped
down and galvanically isolated by a transformer
T. The zero crossing of the signal is detected
to triger a precision quartz controlled
monostable circuit Q. For each cycle of
the input signal, the monostable switches
a highly stabilized D.C.Voltage to an amplifier
A. The output of the amplifier, a constant
voltage with fixed pulse width is filtered
and averaged. The average signal is proportional
to the frequency of the input signal. To
suppress the initial range, for instance
up to 45Hz a fixed voltage is subtracted.
The difference is fed to a current converter
C to provide a load independent d.c. Current
output, which can be either bipolar or unipolar. |
|
|
Features
- Available
in accuracy class index - 0.2, 0.5, & 1.0
- Withstands
wide temperature variations.
- VA
burden on CT/PT very low. - < 0.5 VA
- Wide
range of Input / Output to meet National / International
requirements.
- Comply
to revised IEC 60688 (1997-10) standards.
- Flexibility
in auxiliary power supply requirements - A.C.
/ D.C.
- Rugged
and vibration resistant.
- Withstands
seismic test as per IEC 344-1974 for Nuclear
Power Applications.
- Available
in dust proof sheet plastic enclosures suitable
for Back panel / Din rail mounting.
- Multiple
outputs also available - upto 4.
- High
input / Output isolations - 4.0 KV.
|
 |
Characteristics
|
|
Technical
Data
| Measuring
Range |
>
1 0-Hz to < 1KHz |
| Rated
Input |
10
to 660V.AC |
| Internal
Consumption |
<
3VA for selfpowered. |
| Auxiliary
Power Supply |
110/240
V AC or
12/24/48/110/220V DC
Or Self Powered |
Nominal
Output
(Unipolar/Bipolar) |
0-2.5,
0-5,0-10mA D.C
4-20mA D.C
10-0-10 mA DC
0-10V D.C. |
Load
Range (Ohms)
a) Current Output
b) Voltage Output |
Max 15V/Iout
Min1K Ohms |
| Residual
A.C. Ripple |
<
1% (P-P) |
Overload
Capacity
a) Continuous
b) Momentary |
1.2 Vn, 2.0 In
2.0 Vn for 1 sec. |
| Accuracy
Class |
0.2
/ 0.5 / 1.0 |
| Response
Time |
<
0.5 sec. |
| Input
- output Isolation |
4
KV |
| Operating
Temperature |
0
- 50°C |
| Impulse
Voltage Test |
Confirms
to IEC 251- 5KV having waveform of 1.2/50
microseconds. |
| HF
Interference |
Confirms
to IEC 255-4 |
| Environment
Condition |
User
group II as per IEC 60688 |
| Configuration |
1-Phase |
| Number
of output |
1,
2, 3 |
|
|
Block Diagram
|
|
|
|
| |
|
|
|
