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Epsilon Eb and EN Drives Reference Manual
Figure 14: EN-214 Shunt Power RMS vs. Heatsink RMS
External Shunt Operation
The DC bus is accessible for applications requiring an external shunt regulator. Control
Techniques 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.
50 C
40 C
30 C
20 C
0%
20%
40%
60%
80%
100%
120%
140%
0% 50% 100% 150%
Heatsink RMS
Shunt Power RMS
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