Power Wiring, continued

Optional

The following diagram shows the connections between the optional external Regen

External Regen

resistor and the 17S drive. The drive is shipped with a jumper installed on

Resistor

connector X8, terminals RB and RBint. If you are going to use an optional external

Connection

Regen resistor, then remove the jumper to disconnect (and thus disable) the

 

internal Regen resistor.

 

Fusing of the two lines to external Regen Resistor is mandatory.

 

Use high voltage AC/DC and fast fuses.

Regen Circuit

During braking, energy from the servo motor is returned to the drive and converted

Functional

into heat in the Regen resistor. Operation of the Regen resistor is controlled by the

Description

Regen circuit using thresholds that are adjusted to the main supply voltage that is

 

configured in the UniLink software. The following is an abbreviated functional

 

description of the Regen circuit operation.

 

λ Individual drive (not coupled through the DC Link circuit) - The circuit starts to

 

respond at a DC Link voltage of 400V, 720V or 840V (depending on the supply

 

voltage). If the energy fed back from the servo motor is higher than the preset

 

Regen power, then the drive issues a "Regen power exceeded" signal and the

 

Regen circuit will be switched off. Upon the next internal check of the DC Link

 

voltage, an overvoltage will be detected, the fault relay contact will be opened

 

and the drive will be switched off with the error message "Overvoltage".

 

λ Multiple drives (coupled through the DC Link circuit) - In this case, the Regen

 

energy is distributed equally among all the drives.

 

 

 

Continued on next page

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Image 63
Schneider Electric 17S Series manual Functional, Description of the Regen circuit operation

17S Series specifications

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