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