Fema C Series User Manual

FEMA ELECTRÓNICA . Series C . C40-D
11
• Measuring process signals
The instrument accepts the measure of process signals in
4/20 mA and 0/10 Vdc. The instrument provides excita-
on voltage to power up transducers.
• 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 instru-
ment. Higher signal values may cause instrument damage. Lower val-
ues 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’ - ‘Vexc’ or ‘External control’
To congure the +15 Vdc excitaon voltage at terminal 5, set internal
jumper ‘T’ at posion 1-2 (see secon 1.9). Transducers with a con-
sumpon of up to 30 mA can be powered from this terminal.
To congure the ‘EK’ external contact funcon at terminal 5, set inter-
nal jumper ‘T’ at posion 4-5 (see secon 1.9). See secon 1.9 for a list
of available funcons.
1.16 Process measures
• 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 jumpers
is indicated at secon 1.9.
See below a list of typical connecons :
• signal 4/20 mA acve
• signal 4/20 mA passive • signal 0/10 Vdc passive
signal ( mA-)
+15 Vdc (mA+)
12345
+Vdc
common
+15 Vdc
12345
• signal 0/10 Vdc acve
mA +
mA -
12345
+Vdc
common
12345
Ranges
of measure
Scale
by default
Scalable Jumper ‘S’
(see secon 1.9)
Jumper ‘T’
(see secon 1.9)
Accuracy
(% FS)
Max.
oversignal
Connecon
( terminals)
Z
in
4/20 mA
passive
(needs Vexc.)
0/100.0
de 9999
a -1999
D
1-2
<0.15 % 25 mA
2 (signal)
5 (Vexc)
4.7 Ohm
acve
4-5
2 (mA+)
4 (mA-)
0/10 Vdc
passive
(needs Vexc.)
A
1-2
<0.20 % 25 Vdc
2 (+Vdc)
4 (comm.)
5 (Vexc)
1 M
acve 4-5
2 (+Vdc)
4 (comm.)
Table 15 - Ranges of measure for process signals
1.17 Measuring frequency
• How the instrument measures frequency
The instrument measures frequency from an AC voltage
(Vac) or AC current (Aac) signal. The instrument detects
each ‘0’ crossing of the signal, either ‘0 Vac’ or ‘0 Aac’. All
available Vac and Aac signal ranges are accepted as frequency input
signal.
• How to congure the instrument to measure frequency
To measure frequency from a Vac signal, select the internal jumpers for
the desired AC voltage range (see secon 1.9), connect the signal for
the selected voltage range (see secon 1.10), and congure the instru-
ment to measure frequency (see secon 1.29.1). The same applies to
measure frequency from Aac signals. See example at secon below.
• Scaling
The default resoluon is 0.1 Hz. 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 and minimum signal
Frequency signals below 15 Hz are measured as ‘0’. Frequency sig-
nals higher than 100 Hz are out of accuracy. Signals higher than
1000 Hz will read ‘display overow’ ‘d.oVr’ error.
Ranges
of measure
Scale
by default
Scalable AC signal
(see secon 1.9)
Jumper ‘T’
(see secon 1.9)
Response
me
Accuracy
(% reading)
15 Hz to
100 Hz
0/100.0
from 9999
to -1999
select Vac or
Aac range
4-5 70 mSec.
<0.15% of
reading
Table 16 - Ranges of measure for frequency
• Example
To measure the 50 Hz frequency from a 230 Vac
power line, select jumpers ‘GI’ for 600 Vac signal
range (see secon 1.9), connect signal to termi-
nals ‘1’ and ‘4’ (see secon 1.10), and congure
‘frequency’ at the input signal conguraon
menu (see secon 1.29.1).

Fema C Series Specifications

General

Brand	Fema
Model	C Series
Category	Measuring Instruments
Language	English