21
Chapter 4 - Connections
XtrapulsEasy
™-DB - Installation Guide
Check that the voltage drop in the power supply lines of the encoder cable is complying with the technical
specifications of the encoder. The voltage drop value for a given cable is calculated as follows:
²]
[
]
[
].
[
.
10
.
40
]
[
6
mm
S
mA
I
m
L
V
U
C
with
U:
voltage drop in volts
Lc:
cable length in meters
I:
encoder current in milliamps (see technical specifications)
S:
section in square millimetres
Due to this voltage drop:
An encoder with a wide power supply voltage range should be selected,
If the encoder has power supply SENSE feedback lines, they can be connected to the power supply lines in
order to reduce the voltage drop by the half (the SENSE feedback signal is not used in this drive).
Brake equipped motors must also have their brake cables shielded in order to be EMC compliant.
Maximum cable length:
100m.
For cable length > 25m, we advise:
- the use of the maximum cable section allowed by the connectors,
- the mounting of a reactance with an inductive value between 1% and 3% of the motor inductive value for the
motor cable. The reactance inductive value must be taken into account in the calculation of the current loops.
The current rating of the reactance must be higher than or equal to the drive rating.
The reactance must be mounted at the drive output.
Due to the use of a reactance, a shielded cable is not mandatory anymore.
A more complex sinus filter type B84143V x R127 by company Epcos may also be mounted instead of the
reactance.
UNDESIRABLE EFFECTS OF MOTOR CABLES LONGER THAN 25M:
- Heating of the power module, the motor and the cable.
- High overvoltage on the motor windings, involving a shortening of their lifetime.
The reactance reduces the undesirable effects on motor and drive but it may be quite heated. This requires an
appropriate fan.
4.4.2 - Serial link and CAN communication cables
Serial link and CAN communication cables must also be shielded according to the shield connection
recommendations above.
4.4.3 - Very important
Check the connections, especially of the 24V
DC
and power supplies. Check that the housing serigraphy actually
corresponds to the power connections.
Check that the STO/INHIBIT input is powered.
CAUTION!
Control cables (resolver, serial link, CAN) and power cables must be connected and disconnected with the
drive
turned OFF
.
Reminder:
The power voltage may remain several minutes at the power capacitor terminals.
A contact with high voltage may involve severe physical damage.
