52 Rockwell Automation Publication MOTION-AT007A-EN-P - May 2020
Chapter 5 Regenerative Bus Supply Configurations With Active Shunt
Active Shunt Considerations
External active shunts are required in the following use cases:
• The 2198-RPxxx regenerative bus supply provides DC-bus power while
DC-bus regulation is not enabled.
• One permanent magnet motor runs above its bus overvoltage speed. See Kinetix 5700 Servo Drives User Manual, publication
2198-UM002
, information on the Field Weakening Mode feature.
• One permanent magnet motor drives a vertical load that could make the motor accelerate above the bus overvoltage speed during a
fault condition.
• Any condition where total shared DC-bus regenerative power is greater than the 2198-RPxxx regenerative bus supply capacity. For
example, consider a peak-power stopping condition.
• The 2198-RPxxx regenerative bus supply is operating with DC-bus regulation enabled and the regenerative bus supply loses three-
phase AC input power, 24V DC input power, or has a fault condition.
Active shunts are available from the Rockwell Automation Encompass partner Powerohm Resistors, Inc. See http://www.powerohm.com
for
more information on Powerohm active shunts.
ATTENTION: To avoid damage to the Kinetix 5700 drive system, wire the active shunt thermal switch to a digital input on the power
supply and configure the Shunt Thermal Switch OK function in the Logix Designer application.
ATTENTION: DC-bus failure can cause damage to all drive modules in the bus group, not just the inverter connected to the motor.
IMPORTANT Powerohm Bulletin PKBxxx active shunt modules use built-in internal brake resistors. Bulletin PWBxxx active shunt modules
require appropriately sized external brake resistors.
Table 42 - Compatible Active Shunt Specifications (internal brake resistor)
Kinetix 5700 Power Supply
Powerohm
Resistors
Cat. No.
(1)
(1) How the Powerohm PKBxxx shunts connect to the 2198-RPxxx regenerative bus supply is explained in 2198-RPxxx Bus Supply with External Active Shunt (built-in brake resistor) on page 54.
Input Voltage,
nom
Turn -on
Bus Voltage
Continuous
Power
kW
Resistance
(internal)
Ω
Resistance
(minimum)
Ω
Continuous
Current
Amps
Peak
Current
Amps
2198-RPxxx regenerative bus supply
when DC-bus regulation is not enabled.
PKB005
480V AC
750V DC
1.50 108 – 2.00 6.9
PKB010 2.06 52.7 – 2.75 14.2
PKB050 7.00 10.5 – 9.30 71.4
2198-RPxxx regenerative bus supply
when DC-bus regulation is enabled.
PKB005-800
800V DC
1.50 108 – 1.88 7.4
PKB010-800 2.06 52.7 – 2.58 15.2
PKB050-800 7.00 10.5 – 8.72 76.2
Table 43 - Compatible Active Shunt Specifications (no internal brake resistor)
Kinetix 5700 Power Supply
Powerohm
Resistors
Cat. No.
(1)
(1) How the Powerohm PWBxxx shunts connect to the 2198-RPxxx regenerative bus supply is explained in 2198-RPxxx Bus Supply with External Active Shunt (external brake resistor) on page 55
Input Voltage,
nom
Turn -on
Bus Voltage
Continuous
Power
kW
Resistance
(internal)
Ω
Resistance
(minimum)
Ω
Continuous
Current
Amps
Peak
Current
Amps
2198-RPxxx regenerative bus supply
when DC-bus regulation is not enabled.
PWB035
480V AC
750V DC
26.25 – 7.5 35 100
PWB110 82.5 – 2.5 110 300
2198-RPxxx regenerative bus supply
when DC-bus regulation is enabled.
PWB035-800
800V DC
26.25 – 8.0 35 100
PWB110-800 82.5 – 2.7 110 300
ATTENTION: Do not use Powerohm active-shunt modules at input line voltages that exceed 528V AC. Active-shunt thermal-overload
shutdown can occur if input line voltage exceeds 528V AC.
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