Emerson Epsilon Eb Series Reference Manual page 63

Epsilon Eb and E Series EN Drives Reference Manual
External Shunt Operation
The DC bus is accessible for applications requiring an external shunt regulator. EMERSON
Motion Control offers an external shunt regulator (model RSR-2) which can provide
additional regenerative power dissipation.
Note
The external shunt regulator must be able to sense the DC bus voltage and switch the shunt
resistor in and out of the circuit as needed to maintain acceptable bus voltage.
The shunt power rating required is determined by the application.
The connection for an external shunt regulator is between Bus - and Bus +.
External Shunt Regulator Requirements:
• Shunt trip "On" voltage: 415 to 435 VDC (390 to 395 VDC for Epsilon)
• Shunt trip "Off" voltage: 385 to 405 VDC (380 to 385 for Epsilon)
• Minimum resistance: 20 ohms (20 ARMS)
• Power Requirements: Application dependent
You should mount the external shunt control and resistor so that the heat it generates does not
affect the drive.
Figure 33: External Shunt Wiring Diagram
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