ABB RTAC-01 - Page 16

Chapter 3 – Installation
3-4 RTAC-01 User’s manual
Figure 3-2 Approximate power consumption of an encoder for four different
cable lengths. The chart is based on a measurement with a 24 V DC, 1024 ppr
pulse encoder with differential outputs coupled to a motor shaft rotating at 1500
rpm.
0 150 300 450 600 750 900 1050 1200 15001350
0 600 1200 1800 2400 3000 3600 4200 4800 60005400
EPN = 2048 ppr:
EPN = 512 ppr:
EPN = 1024 ppr:
EPN = Encoder pulse number
P
idle
= Encoder power consumption when idle. See encoder documentation.
Motor
speed
(rpm)
0 300 600 900 1200 1500 1800 2100 2400 30002700
P
idle
P
idle
+ 0.25 W
P
idle
+ 0.5 W
P
idle
+ 0.75 W
P
idle
+ 1.0 W
P
idle
+ 1.25 W
P
idle
+ 1.5 W
P
idle
+ 1.75 W
P
idle
+ 2.0 W
Encoder power
consumption
Cable length
300 m
150 m
100 m
20 m