Operating instructions

5-4 Electrical Data Rexroth IndraDrive
DOK-INDRV*-FU*********-IB01-EN-P
Limited Length of Motor Power Cables
Keep in mind, that the allowed maximum motor cable length is depending
on the switching frequency of the power output stage. On principle, the
higher the switching frequency, the shorter the allowed cable length (in
order to protect the drive controllers against overload).
Note: Always use switching frequencies supported by the
components of your drive system. Observe the technical data
of the drive controllers and motors.
See also Parameter Description "P-0-0001, Switching frequency of the
power output stage".
The lengths indicated in the table below are recommended as guide
values (at an ambient temperature of ≤ 40 °C in accordance with
EN 60 204).
Allowed line lengths for motor connection without filter measures at
motor output:
Max. allowed line length [m]PWM frequency [kHz]
Shielded line Unshielded line
1)
2
2)
100 175
4 75 150
8 38 150
12 25 not allowed
16 18 not allowed
1) only allowed at HCS drive controllers
2) depending on the drive controller
Fig. 5-4: Line lengths
Operation with unshielded motor cables of up to 150 m
• aims at applications with "operation without encoder" (Open Loop)
• does not include the control voltage lines to the motor
• requires additional measures with regard to EMC on the part of the
operating company
Allowed line lengths for motor connection with additional components
HMF or HML:
Max. allowed line length [m]PWM frequency [kHz]
Shielded line Unshielded line
1)
4
2)
75 200
1) only allowed at HCS03 drive controllers
2) higher PWM frequencies are not allowed
Fig. 5-5: Line lengths
The documentation "Rexroth Connection Cables; Selection Data" is
available for selecting the motor power cables and other connections,
such as encoder cables.
Rexroth IndraDrive drive systems have to be equipped with shielded
motor power cables of the RKL line.
Limited Lengths of Motor Power
Cables
Documentation Motor Power
Cables