Fema C Series User Manual

FEMA ELECTRÓNICA . Series C . C40-D
7
1.11 Measuring DC voltages and DC currents
• Measuring DC signal ranges
The instrument accepts the measure of DC voltages
and currents, with ranges from 60 mVdc up to 600 Vdc,
covering applicaons with current shunts, tachometric
dynamos, baeries, process, etc. DC currents signals up
to 5 Adc are accepted, and it has a range of 20 mAdc.
• Bipolar ranges
All signal ranges are bipolar, and the instrument can measure both
the posive and the negave signal.
• Scaling
The instrument allows to scale the reading to 4 digits (9999 / -1999)
with congurable decimal point to any posion. The ‘second scaling’
funcon can also be used (see secon 1.25).
• Maximum oversignal
‘Maximum oversignal’ is the maximum signal accepted by the in-
strument. Higher signal values may cause instrument damage. Low-
er values are non destrucve but may be out of accuracy specica-
ons.
• Response mes
The response me to a signal step is 300 mSeconds, independent of
the signal range selected.
• Terminal 5 ‘mulfuncon’ - External control
Terminal 5 remains congured as ‘EK’ external control funcon. See
secon 1.9 for a list of available funcons.
• Start-up, connecons and jumpers
For instrument start-up follow the steps listed at secon 1.7. Signal
connecons are indicated at secon 1.5. Locaon for internal jump-
ers is indicated at secon 1.9.
Vdc ranges Scale
by default
Scalable Jumper ‘S’
(see secon 1.9)
Jumper ‘T’
(see secon 1.9)
Accuracy
(% FS)
Max. oversig-
nal
Connecon
( terminals)
Z
in
±600 Vdc 600
from 9999
to -1999
G
4-5
<0.20 %
800 Vdc
1(+) 4(-)
12 M
±200 Vdc 200.0 - - - 800 Vdc 12 M
±20 Vdc 20.00 A 150 Vdc
2(+) 4(-)
1 M
±2 Vdc 2.000 B 100 Vdc 100 K
±200 mVdc 200.0 C 30 Vdc 10 K
±60 mVdc 60.0 E <0.25 % 3 Vdc 1 M
Table 7 - Measuring ranges in Vdc
Adc ranges Scale
by default
Scalable Jumper ‘S’
(see secon 1.9)
Jumper ‘T’
(see secon 1.9)
Accuracy
(% FS)
Max. oversig-
nal
Connecon
( terminals)
Z
in
±5 Adc ±5.00
from 9999
to -1999
- - -
4-5
<0.25 %
7 Aac
(max. 7 sec.)
3(+) 4(-) 20 mOhm
±20 mAdc ±20.00 D <0.15 % 25 mAdc 2(+) 4(-) 4.7 R
Table 8 - Measuring ranges in Adc
Applicaons
... with shunts ...
measure of DC currents through a cur-
rent shunt of 60 mV, 100 mV or 150 mV
and scaled reading
... direct measure ...
direct measure of currents up to 5 Adc
and voltages up to 600 Vdc
... with baeries ...
measure of the baery voltage at
12 Vdc and 24 Vdc
... with tachometric dyna-
mos ...
read the speed in RPM from a tacho-
metric dynamo voltage signal
... with speed variators ...
measure the voltage signal from the
variator, proporonal to the RPM speed
of the motor
Table 9 - Applicaons with DC signals
See below a list of typical connecons :
±5 Adc
common
12345
±600 Vdc
common
12345
±60 mVdc
common
12345
• ±5 Adc• ±600 Vdc
• ±200 Vdc
• ±20 Vdc to ±60 mVdc
• ±20 mAdc

Fema C Series Specifications

General

Brand	Fema
Model	C Series
Category	Measuring Instruments
Language	English