Rockwell Automation 2090-UCSR-A300 300 W Active Shunt Regulator - Manual

1 Publication 2090-IN002C-EN-P — June 2007
Installation Instructions
300 W Active Shunt Regulator
The 300 W Active Shunt Regulator is used in systems that see significant dc
voltage regeneration from large inertial load applications. The Allen-Bradley
Ultra3000, Ultra5000, and ULTRA 100 drives (see table below) do not have
internal shunt circuitry to dissipate excess energy, resulting in overvoltage
faults. For the smooth braking of large inertial loads, the use of a shunt
regulator is recommended.
The active shunt (catalog number 2090-UCSR-A300 or 1398-SR3AF) can be
used with the following drive products.
The active shunt monitors the dc bus voltage of the drive. If the voltage
reaches activation level, the shunt drops the dc bus voltage and dissipates the
energy as heat. Figure 1 illustrates the drop in dc bus voltage.
Figure 1
Shunt Activation on DC Bus Voltage
Drive Family Cat. No.
Ultra3000 Drives
2098-DSD-005, -005-SE, -005-DN, -010, -010-SE, -010-DN, -020, -020-SE,
-020-DN, -005X, -005X-DN, -010X, -010X-DN, -020X and -020X-DN
Ultra5000 Drives 2098-IPD-005, -005-DN, -010, -010-DN, -020, and -020-DN
ULTRA 100 Drives
1398-DDM-005, -005-DN, -009, -009-DN, -019, -019-DN, -005X, -005X-DN,
-009X, -009X-DN, -019X, and -019X-DN
Voltage Drop for 1.0 ms, min
Time
Actual Shunt Time
Activation Level
Bus
V
o
lt
age