9.10 Motor connection
9.10.1 Motor power connection (X8)
The S748/772 drive is able to protect the connected motor from overloading, if the para-
meters are set correctly and the thermal protection sensor is connected and supervised. With
Kollmorgen motors the valid data are automatically set by the internal motor database. With
motors from other manufacturers the data from the nameplate must be entered to the refer-
ring fields in the motor view of the setup software DriveGUI.
Together with the motor supply cable and motor winding, the power output of the servo amp-
lifier forms an oscillating circuit. Characteristics such as cable capacity, cable length, motor
inductance, frequency and voltage rise speed (see Technical Data, (➜ # 30)) determine the
maximum voltage in the system.
The dynamic voltage rise can lead to a reduction in the motor’s operating life and, on unsuit-
able motors, to flash overs in the motor winding.
Only install motors with insulation class F (acc. to IEC 60085) or above
Only install cables that meet the requirements on (➜ # 33) and (➜ # 63).
Use screw driver for plus-minus-screws (Combiprofile Slotted/Pozidriv) size 2.
Standard applications up to 25m cable length
Application with cable length >25m and special conditions
With long motor cables overvoltage may endanger the motor winding. For cable lengths
above 25m a motor choke 3YLN may be wired into the motor cable, close to the amplifier.
Contact our customer support.
S748-772 Instructions Manual | 9 Electrical Installation
Kollmorgen | kdn.kollmorgen.com | July 2019 73
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