Allen-Bradley PowerFlex 753 Quick Start Manual page 67

For frames 1...7, see Table 43
Table 43 - Dynamic Brake Resistor Parameter Settings
No. Parameter Name External Resistor
User Setting
370 Stop Mode A
372 Bus Reg Mode A
382 DB Resistor Type
383 DB Ext Ohms Resistor NP
384 DB Ext Watts Resistor NP
385 DB ExtPulse Watts Resistor NP
(1) If this information is not available for the dynamic brake resistor, increase the value until nuisance DynBrake OvrTemp Alarm 10 ceases.
to configure these parameters so the dynamic brake properly functions.
Internal Resistor Values
User Setting
1 1 Default:
Options:
2 2 Default:
Options:
1 0 Default:
Options:
N/A Units:
Default:
Min/Max:
N/A Units:
Default:
Min/Max:
(1)
N/A Units:
Default:
Min/Max:
Rockwell Automation Publication 750-QS001A-EN-P - March 2015
Notes
1 = "Ramp" Fans, pumps, and compressors are typically allowed to coast to
stop - dynamic braking is not required.
0 = "Coast"
Ramp to stop mode may cause regenerative energy - dynamic
1 = "Ramp"
braking can be required.
The shorter the decel time, P537 [Decel Time], the greater
potential need for dynamic braking.
1 = "Adjust Freq" Not considered when P370 [Stop Mode A] = 0 "Coast".
1 = "Adjust Freq" If dynamic brake resistor is installed, this parameter must be set
to either 2 "Dyn Brake" or 3 "Both DB 1st".
2 = "Dyn Brake"
3 = "Both DB 1st"
0 = "Internal" Not considered when P370 [Stop Mode A] = 0 "Coast".
0 = "Internal"
1 = "External"
Ohms Observe minimum resistance rating by drive size.
Based on Drive Rating
Minimum Resistor Rating
Watt Sets the continuous rated power reference for the eternal
dynamic brake resistor.
100
1.00 to 500000.00
Watt Sec Refer to the PowerFlex Dynamic Braking Resistor Calculator
Application Technique, publication PFLEX-AT001, for external
2000
resistor pulse watts settings. Or consult the resistor
1.00 to 100000000.00
manufacturer for this specification.
Reference Section
67