Fema Electronica M40-A, User Manual

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FEMA ELECTRÓNICA . Series M . M40-A
7
Decimal point
1.12 Configuration menu
Press ‘SQ’ (
<
) for 1 second to access the ‘configuration menu’.
For a description on how to operate inside the menus see section
1.10
. For a full vision of the ‘configuration menu’ structure see
section
1.13
.
Scaling Input low
Display low
Input high
Display high
To configure the initial set up of the instrument, select the measure
scale, the decimal point position, and scale the reading.
Access the ‘ Input ’ (‘ InP ’) menu to select the measure scale. Options
available are 0/600 Vac, 0/100 Vac, 0/10 Vac, 0/1 Vac, 0/100 mVac,
0/5 Aac and 0/1 Aac. Place the rear jumper according to the scale se-
lected (see sections 1.5 and 1.6).
Access the ‘ Decimal point ’ (‘ dP ’) menu to select the decimal point
position. Move the decimal point by pressing the ‘LE’ (
3
) key.
Scale the reading at the ‘ Scaling ’ (‘ ScAL ’) menu. there are four pa-
rameters to configure :
• ‘ Input low ’ (‘ ILo ’) - minimum input signal, in Vac or Aac.
• ‘ Display low ’ (‘ dLo ’) - reading associated to the minimum input
signal.
• ‘ Input high ’ (‘ IhI ’) - maximum input signal, in Vac or Aac.
• ‘ Display high ’ (‘ dhI ’) - reading associated to the maximum input
signal.
1.12.1 Initial set-up
the ‘ Field correction ’ (‘ F.cor ’) functions allows to correct the instru-
ment scaling parameters, when the instrument is being installed on
the field, providing a fast and easy way to compensate offset signals.
to operate the ‘ Field correction ’ (‘ F.cor ’) function for the offset cor-
rection, generate the minimum input signal and access the ‘ Field
low ’ (‘ F.Lo ’) function. Then the following sequence will start
• message with signal type (‘ mA ’ or ‘ Vdc ’)
• message ‘ wait ’ (‘ WAIt ’) in flash mode
• after 5 seconds, message ‘ ok ’ (‘ oK ’) appears
• at this point, press key SQ (‘
<
‘)
• the menu returns to menu entry ‘ Field Low ’ (‘ F.Lo ’)
The instrument has read the input signal and automatically config-
ures the ‘
Input low ’ (‘ I.Lo ’) for you.
Repeat the process generating the maximum input signal and access
the ‘
Field high ’ (‘ F.hI ’) menu. the instrument will read the input sig-
nal and automatically configure the ‘ Input high ’ (‘ I.hI ’) parameter to
match the signal read.
Application - a current transformer provides a 0/5 Aac output signal
proportional to the consumption of an engine from 0 to 100.0 Aac.
At installation, the operator detects that the reading at maximum
engine consumption reads less than 100.0 Aac, although he knows it
is consuming 100.0 Aac. There is a reading mismatch due to the cur-
rent transformer characteristics.
Configure the instrument for a measure scale of 0/5 Aac and scale
the reading for 0/100.0 Aac. When engine is consuming 100 Aac and
meter is reading less value, apply the ‘Field correction’ / ‘
F.Hi ’ func-
tion and the instrument will automatically correct the reading to
100.0 Aac.
If there is also offset error, the same applies when engine is stopped.
Reading should be 0.0 Aac. If it is not the case, apply the ‘ Field correc-
tion’ / ‘ F.Lo ’ function and the instrument will automatically correct
the reading to 0.0 Aac.
1.12.2 Field correction
Input
Scale 600 Vac
Scale 100 Vac
Scale 10 Vac
Scale 1 Vac
Scale 100 mVac
Scale 5 Aac
Scale 1 Aac
Field correction
Correction high
Correction low Wait (5 sec.)
(
<
)
Wait (5 sec.)
(
<
)