Fema M Series, Руководство пользователя, Страница: 7 / 36

FEMA ELECTRÓNICA . SERIES M . M60-LC
7
Signal
ranges
Accuracy Max. input
signal
0/100 mVdc 0.05% FS
30 V
0/30 mVdc 0.05% FS
0/20 mVdc 0.05% FS
0/15 mVdc 0.05% FS
0/10 mVdc 0.05% FS
0/5 mVdc 0.05% FS
Table 3 - Input signal ranges
1.9.2 Signal ranges
The instrument works with 6 internal signal ranges and
the active range is automatically selected when the in -
strument is started. The selection depends on the value
of the two parameters : ‘ Sensitivity ’ ( ‘MV.V’ ) and ‘ Excita-
tion voltage ’ ( ‘V.EXc’ )
(see section 1.12.2)
Example : with a sensitivity configuration of 2.0000 mV/V
and a configured excitation voltage of 10 Vdc, the instru-
ment selects the 20 mV input signal range, by calculat-
ing 2 mV/V x 10 Vdc = 20 mV.
The internal signal ranges available are shown below at
Table 3
.
1.9.3 Number and type of cells accepted
The instrument accepts connection for up to 8 standard
350 Ohms load cells. With a configured excitation voltage
of 10 Vdc connect from 1 to 4 load cells. With a config -
ured excitation voltage of 5 Vdc connect from 1 to 8 load
cells. For load cells with different impedance, calculate
the current consumption for each cell, and the total must
not exceed the maximum current the instrument can pro -
vide.
In case of problems with the power or the signal provided
by the load cells, the instrument provides three functions
for troubleshooting purposes. These functions allow to
access the signal input value (in mV), the excitation volt -
age value at the ‘sense’ terminals (in Vdc) and the current
provided to the cells (in mA). The operator can use this
values to identify the cause of the problem. See section
1.12.13
for more information on how to access this val -
ues in real time.
44
92
Panel
cut-out
48
1.9.4 Mechanical dimensions (mm
(in)
)
The instrument shows the value for the net weight, and can
be configured to switch reading to gross weight and the actual
value of the tare. The relation between them is :
• Net weight = gross weight - tare
Operator can access these values by configuring the fast ac -
cess menu (key ‘UP (
5
))
(see section 1.12.13) .
Reading the gross weight or tare values activate the front leds
‘A’ and ‘B’
(see section 1.6)
.
1.9.5 Gross weight, net and tare
1.9 Technical data (cont.)
96
(3.78 x 1.89 in)
(3.63 x 1.74 in)
16 8 75
(0.63 in) (2.95 in) (0.31 in)