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Operating Instructions
Transducer for measuring frequency DFT-xxx & DFTA-xxx
Safety precautions to be strictly observed are marked
with following symbols in the Operating Instructions:
The instruments must only be disposed of
in the correct way!
Contents
1. Read first and then ..................................................... 9
2. Brief description .......................................................... 9
3. Technical data ............................................................. 9
4. Mounting ................................................................... 10
5. Electrical connections ............................................... 10
6. Commissioning and maintenance ............................. 11
7. Releasing the transducer .......................................... 11
8. Dimensional drawing ................................................. 11
9. Agency approvals...................................................... 11
10. Declaration of conformity .......................................... 12
1. Read first and then ...
The proper and safe operation of the device
assumes that the Operating Instructions is read
carefully and the safety warnings given in the
various Sections
4. Mounting
5. Electrical connections
are observed.
The device should only be handled by appropriately trained
personnel who are familiar with it and authorised to work
in electrical installations.
Unauthorized repair or alteration of the unit invalidates
the warranty.
2. Brief description
The DFT-xxx & DFTA-xxx transducers are intended for
frequency measurement. The instruments change the
measured value into a proportional load-independent DC
current or DC voltage.
3. Technical data
Measuring input
Measuring range:
f
a
f
a
f
a
f
e
7004-00059-A Rev --.indd
≥ 10 Hz, f
≤ 1500 Hz
e
/(f
-f
) < 50
e
a
: Measuring range start
frequence
: Measuring range end frequence
Nominal frequency:
Nominal input
voltage:
Measuring output
DC current:
Load voltage:
External resistance:
DC voltage:
Load capacity:
Response time:
Power supply
AC/DC power pack (DC or 40 - 400 Hz)
Rated voltage
85 - 230 V DC / AC
24 - 60 V DC / AC
Power consumption:
Options
Connected to the low
tension terminal side:
Power supply from
measuring input
(self powered):
Please note the max. and min. measuring input
voltage!
Type label
inscription
Self powered
by 1/2
(int. 24-60 V)
Self powered
by 1/2
(int. 85-230 V)
Accuracy (acc. to EN 60 688)
Reference value:
Basic accuracy:
Safety
Pollution degree:
Installation category:
Page 9 of 12
See type label
10 - 230 or > 230 - 690 V
0(0.2) - 1 to 0(4) - 20 mA
± 1 to ± 20 mA
- 12 V / 15 V
R
max. [kΩ] ≤
I
ext
AN
- 12 V
resp. ≤
- I
[mA]
AN
I
= Full scale output
AN
0(0.2) - 1 to 0(2) - 10 V
± 1 to ± 10 V
Max. 4 mA
2 / 4 / 8 / 16 periods of the measuring
frequency
Tolerance
DC - 15 to + 33%
AC ± 15%
≤ 2.5 W resp. ≤ 3.5 VA
24 V AC or 24 - 60 V DC,
see Fig. 4
≥ 24 - 60 V AC or
85 - 230 V AC, see Fig. 3
Input voltage
range
Tolerance
= internal power
supply range
24 - 60 V AC
± 15%
85 - 230 V AC
Output span
Class 0.2
2
III
15 V
[mA]
Power
supply
connec-
tion
Internal
measu-
ring
input
8/12/09
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