Rockwell Automation Publication MOTION-AT007A-EN-P - May 2020 31
Non-regenerative Common DC-bus Configurations With Passive or Active Shunt Chapter 3
Active Shunt Considerations
External active shunts are required in the following use cases:
• 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.
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 18 - 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-Pxxx regenerative bus supply is explained in 2198-Pxxx Power Supply with External Active Shunt (built-in brake resistor) on page 33.
Input Voltage,
nom
Turn -on
Bus Voltage
Continuous
Power
kW
Resistance
(internal)
Ω
Resistance
(minimum)
Ω
Continuous
Current
Amps
Peak
Current
Amps
2198-Pxxx DC-bus power supply
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
Table 19 - 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-Pxxx regenerative bus supply is explained in 2198-Pxxx Power Supply with External Active Shunt (external brake resistor) on page 34.
Input Voltage,
nom
Turn -on
Bus Voltage
Continuous
Power
kW
Resistance
(internal)
Ω
Resistance
(minimum)
Ω
Continuous
Current
Amps
Peak
Current
Amps
2198-Pxxx DC-bus power supply
PWB035
480V AC 750V DC
26.25 – 7.5 35 100
PWB110 82.5 – 2.5 110 300
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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