SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Operating Instructions Manual, Page: 46 / 260

44
Operating Instructions ACU
09/08
5.4.3.4 Group drive
In the case of a group drive (several motors at one frequency inverter), the total
length shall be divided across the individual motors according to the value given in the
table. Please note that group drive with synchronous servomotors is not possible.
Use a thermal monitoring element on each motor (e.g. PTC resistor) in order to avoid
damage.
5.4.3.5 Speed sensor connection
Install sensor cables physically separate from motor cables. Comply with the sensor
manufacturer's specifications.
Connect the shield close to the frequency inverter and limit the length to the neces-
sary minimum.
5.4.4 Connection of a Brake Resistor
Connection of a brake resistor is done via terminal X2.
Danger! Switch off power supply before connecting or disconnecting the brake
resistor cables to terminal X2. 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
temperature 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
Rb2 Rb1
X2
X1
Note:
Limit the length of the brake resistor cables to the necessary minimum.
Operating Instructions ACU 09/08 44