Fema C Series, User Manual, Page: 13 / 32

FEMA ELECTRÓNICA . Series C . C40-D
13
1.20 ‘Fast access’ menu
The ‘
fast access
’ menu allows to configure the front key ‘UP’ (‘
5
’) as
a direct access to the alarm 1 and / or alarm 2 setpoint values, and / or
the memory of maximum and minimum reading. The objective is to
provide the operator with a fast and direct access to alarm setpoints,
without accessing the standard configuration menu.
Access to ‘
fast access’
menu is still allowed even with active ‘pass -
word’ function, allowing the operator to modify the alarm setpoints,
while still blocking any other change on the configuration.
The ‘
fast access ’ menu is configurable, and it allows to assign to the
front key none, one, several or all of the available functions. In case
of configuring access only to alarm 1, when pushing front key ‘UP’
(‘
5
’), the display directly access the setpoint value of alarm 1 (same
for alarm 2)
To configure the ‘
fast access’
menu see section
1.29.4.
1.21 Scaling
The instrument can scale the reading to any value between 9999 and
-1999 and configure the decimal point position, for all signal ranges
except temperature ranges (thermocouples, Ni and Pt sensors, NTC
and PTC sensors) are not scalable. The scaling configuration is a sim -
plified two steps process :
1. configure at the ‘ Display Low ’ (‘ d.Lo ’) parameter the reading
value associated to the low signal range
2. configure at the ‘
Display High
’ (‘
d.Hi
’) parameter the reading
value for the high signal range
Some examples are explained below:
• for AC voltage and current ranges, for example 0/600 Vac,
configure at ‘
d.Lo
’ the reading for a signal of 0 Vac. Configure at
‘
d.Hi
’ the reading for a signal of 600 Vac.
• for DC voltage and current ranges, for example ±600 Vdc, con -
figure at ‘ d.Lo ’ the reading for a signal of 0 Vdc. Configure at
‘ d.Hi ’ the reading for a signal of 600 Vdc.
• for process ranges, for example 4/20 mA, configure at ‘
d.Lo
’ the
reading for a signal of 4 mA. Configure at ‘
d.Hi
’ the reading for a
signal of 20 mA.
• for potentiometer ranges, configure at ‘
d.Lo
’ the reading for a
signal of 0% (0 R). Configure at ‘
d.Hi
’ the reading for a signal of
100% (nominal of the potentiometer).
To configure the scaling see section
1.29.2.
1.22 Offset reading
The instrument provides a ‘
second scaling
’, independent and addi -
tional to the standard scaling explained at section
1.21
. Control of
the scaling to be applied, with a free potential contact called ‘
Exter-
nal control
’. To configure the ‘
second scaling
’ :
1. configure the internal jumper ‘T’ to activate the ‘EK’ external
control function (see section 1.9).
2. associate the external control to the ‘
second scaling
’ function,
at the configuration menu ‘
ScL.2
’ set the value ‘
EXt.c
’ (‘
External
control
’)
(see section 1.29.6)
3. configure the scaling at the configuration menu ‘
Tools
’ \ ‘
ScL.2
’
(see section 1.29.7).
4. apply connections to the external control
1.23 ‘Eco’ mode
The ‘ external control ’ function allows to activate, by closing a free
potential contact, one of the following configurable functions :
• activation of the second scaling
• change the active decimal point
• ‘hold’ the reading
• ‘tare’ function
• visualize de memory of maximum (or minimum)
To configure the ‘EK’ external contact function, set internal jumper
‘T’ at position 4-5
(see section 1.9).
The ‘EK’ external control function
is not compatible with function ‘Vexc’ (excitation voltage), the mea -
sure of 3 wire Pt100, and the measure of potentiometers.
To assign a function to the ‘
external control ’ see the configuration
menu at ‘ External control ’ (see section 1.29.6).
The function associated to the ‘EK’ external control activates when
short-circuiting terminal 5 and terminal 4.
1.24 External control
The ‘
Eco
’ mode reduces the consumption of the instrument to a level
of 0.3 W. The ‘
Eco
’ mode turns off the display, while the right decimal
point remains flashing gently on and off, showing that the instrument
is running on the background.
Display will turn on when an alarm activates, or when the opera
-
tor touches any of the front keys. If no alarms are active, and there
is no interaction from the operator, the instrument will turn off the
display. The waiting time before display turn off is configurable from
5 to 255 seconds.
To configure the ‘
Eco
’ mode see the configuration menu at ‘
Tools
’ \
‘
Eco
’
(see section 1.29.7).
1.25 Second scaling
The ‘ Offset reading ’ (‘ oFFS ’) parameter allows a number of counts
to be subtracted from the reading. This is specially useful to manu -
ally compensate for resistance errors due to wire resistance, when
measuring with 2 wires Ni and Pt probes, and resistances. Applies
to all signal ranges. See configuration menu at ‘ Tools ’ \ ‘ oFFS ’ (see
section 1.29.7).
* Risk of electric shock. The ‘EK’ external control function shares termi-
nal 4 with the common of the input signal connection. When measur-
ing dangerous voltages AND using ‘EK’ external control contact, apply
the appropriate protections to isolate the operator from dangerous voltages.