Mettler Toledo IND780 Guia De Instalacion página 187

talking must be evaluated. Note that the field circuit parameters for capacitance of the load cell
must be multiplied by the quantity of load cells used. The inductance value is the same for 1
through 24 load cells since the inductance is in parallel. Also note that the field circuit parameters
for the load cell cable must be multiplied by the total load cell cable length.
V
C
L
V
C
L
V
C
L
64063214 | 07 | 02/2018
Formule : Évaluation de l'alimentation
ou U doit être ≥ V
max i (l/c) oc
26.4 VDC ≥ 12.6 VDC
+ C ≤ C ou C
i (l/c) Câble a o (PDX)
C = 11 nF * 10 cells = 110 nF = .110 µF
i (l/c)
C = 60 pF / pied * 600 pieds = 36,000 pF = 0.036 µF
Câble
(.110 µF + 0.036 µF) = 0.146 µF ≤ 59.4 µF
+ L ≤ L ou L
i (l/c) Câble a o (PDX)
L = 0 µH
i (l/c)
L = 0.2 µH / pied * 600 pieds = 120 µH
Câble
(0 µH + 120 µH) = 120 µH ≤ 200 µH
Formule : Transmission CANBus
ou U doit être ≥ V ou U
max i (l/c) oc
26.8 VDC ≥ 5.277 VDC
+ C ≤ C ou C
i (l/c) Câble a o (PDX)
C = .602 nF* 10 cells = 6.02 nF = .00602 µF
i (l/c)
C = 60 pF / pied * 600 pieds = 36,000 pF = 0.036 µF
Câble
(.00602 µF + 0.036 µF) = 0.04202 µF ≤ 1000 µF
+ L ≤ L ou L
i (l/c) Câble a o (PDX)
L = 0 µH
i (l/c)
L = 0.2 µH / pied * 600 pieds = 120 µH
Câble
(0 µH + 120 µH) = 120 µH ≤ 2.0 mH
Formule : Réception CANBus
ou U doit être ≥ V
max i (PDX) oc
26.8 VDC ≥ 5.277 VDC
+ C ≤ C ou C
i (PDX) Câble a o (l/c)
C = .602 nF * 10 cells = 6.02nF = .00602 µF
i (PDX)
C = 60 pF / pied * 600 pieds = 36,000 pF = 0.036 µF
Câble
(.00602 µF + 0.036 µF) = 0.04202 µF ≤ 1000 µF
+ L ≤ L ou L
i (PDX) Câble a o (l/c)
L = 0 µH
i (PDX)
L = 0.2 µH / pied * 600 pieds = 120 µH
Câble
(0 µH + 120 µH) = 120 µH ≤ 2.0 mH
METTLER TOLEDO Terminal IND780 Division 2 et Zone 2/22 Guide d'installation
ou U
o (PDX)
o (PDX)
ou U
o (l/c)
SATISFAIT ou NON
SATISFAIT
SATISFAIT
SATISFAIT
SATISFAIT ou NON
SATISFAIT
SATISFAIT
SATISFAIT
SATISFAIT ou NON
SATISFAIT
SATISFAIT
SATISFAIT
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