Operating Instructions ACTIVE 06/0738
38 Operating Instructions ACTIVE 06/07
5.4.3.4 Group drive
For a group drive (several motors at one frequency inverter) the total length must be
shared in the number of motors according to the table values. A group drive with
synchronous servomotors is not possible.
Use a thermocouple for monitoring (for example PTC resistor) at each motor to avoid
damage.
5.4.3.5 Speed sensor connection
Install the speed sensor lines physically separate from the motor cables. Comply with
the manufacturer’s data of the speed sensor.
Install the shielding near to the frequency inverter and keep the speed sensor lines as
short as possible.
5.4.4 Connection of a Brake Resistor
The connection of a brake resistor is done via terminal X2.
Danger! Switch off power supply before connecting or disconnecting the brake
resistor cables. Dangerous voltage may be present at the motor terminals
and the terminals of the brake resistor even after the frequency inverter
has been disconnected safely from power supply. Wait for some minutes
until the DC link capacitors have discharged before starting to work at the
unit.
• The unit may only be connected with the power supply switched off.
• Make sure that the frequency inverter is discharged.
Caution! The brake resistor must be equipped with a temperature switch. The tem-
perature switch must disconnect the frequency inverter from mains supply
if the brake resistor is overloaded.
L1
L2
L3
K1
K1
R
b
T1
Rb1 Rb2
T2
Rb2Rb1
X2
X1
Note: Keep the brake resistor lines as short as possible.
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