SIGMATEK MDD 111-1, Руководство пользователя

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MDP 102-1
29.08.2019 Page 61
The Maximum cable length is 10 m, with the exception of the following encoders:
Type code
description
Motor type Encoder Type Max. Length
LA AKM2
– AKM3
ECI 1118 8,2 m
LB AKM2
– AKM3
EQI 1130 6,9 m
DB AKM2
– AKM4
EQN 1125 9,4 m
When using EnDAT
®
with the MDD 100, the cable length must be taken into consideration
(voltage drop)!
Formula for calculating the cable length (max. 10 m):
(A * U) / (ρ * I * 2) =
L
cable
Example of cable length calculation:
For
AKM2 xx - xxxx DB xx (ECN 1125 encoder with 4.75 V minimum supply and 14 A maxi-
mum current):
Maximum voltage drop = 5 V
– 4.75 V = 0.25 V
(0.18 mm² * 0.25 V) / (0.017 Ω * mm²/m * 0.14 A * 2) = 9.4 m
Table for EnDat
®
encoder cable lengths:
Type code
description
Motor type Encoder Type
Encoder Perfor-
mance
Max. Length
DA AKM2-4 ECN 1113 4,75 V 110 mA 10 m
DA AKM5-8 ECN 1313 3,6 V 110 mA 10 m
DB AKM2-4 EQN 1125 4,75 V 140 mA 9,4 m
DB AKM5-8 EQN 1325 3,6 V 140 mA 10 m
LA AKM2-3 ECI 1118 4,75 V 160 mA 8,2 m
LA AKM4-8 ECI 1319 3,6 V 170 mA 10 m
LB AKM2-3 EQI 1130 4,75 V 190 mA 6,9 m
LB AKM4-8 EQI 1331 3,6 V 170 mA 10 m
Derivation of the formula:
R = U / I
Maximum resistance, calculated via the encoder power
R = ρ *
L
wire
/ A wire resistance over the entire wire length
Applied:
R = ρ * Lwire / A
Solved for the maximum wire length calculation:
(A * U) / (ρ * I) =
L
wire