90 Rockwell Automation Publication 750-PM001N-EN-P - February 2017
Chapter 3 Drive Port 0 Parameters
File
Group
No. Display Name
Full Name
Description
Values
Read-Write
Data Type
DRIVE CFG
Braking Features
370
371
Stop Mode A
Stop Mode B
Stop Mode A, B
Method of stopping the drive when a stop command is given. Normal Stop command
and the RUN input changing from true to false will command a Normal Stop. When
using TorqProve, parameter 1100 [Trq Prove Cfg] Bit 0 “TP Enable” = 1, the stop mode
must be set to option 1 “Ramp.”
“Coast” (0) – Power removed from motor, motor coasts to zero.
“Ramp” (1) – Decelerates to zero speed at the decel rate. Power is removed when zero
speed is reached.
“Ramp to Hold” (2) – Decelerates to zero speed at the decel rate, followed by DC braking
until the next start sequence.
“DC Brake” (3) – DC braking is immediately applied (does not follow programmed decel
ramp). May have to adjust parameter 397 [DC Brake Kp].
“DCBrkAutoOff” (4) – Applies DC braking until zero speed is reached or DC brake time is
reached, whichever is shorter.
“Current Lmt” (5) – Max torque / current applied until zero speed.
“Fast Brake” (6) – High slip braking for maximum braking performance above base
speed.
Default
Options:
1 = “Ramp”
0 = “Coast”
0 = “Coast”
1 = “Ramp”
2 = “Ramp to Hold”
3 = “DC Brake”
4 = “DCBrkAutoOff”
5 = “Current Lmt”
6 = “Fast Brake”
RW 32-bit
Integer
372
373
Bus Reg Mode A
Bus Reg Mode B
Bus Regulation Mode A, B
Method and sequence of the DC bus regulator voltage. Choices are dynamic brake,
frequency adjust or both. Sequence is determined by programming or digital input to
the terminal block. Using options 1, 3, or 4, may result in extended decel times.
Typically, only P372 [Bus Reg Mode A] is used. P373 [Bus Reg Mode B] is only used when
P187 [DI PwrLoss ModeB] is programmed and its corresponding input is high.
Dynamic Brake Setup
If a dynamic brake resistor is connected to the drive, both of these parameters must be
set to either option 2, 3 or 4.
When using any of the dynamic braking settings increase P426 [Regen Power Lmt] from
its default setting of 50%. A setting of 200% will result in more effective braking.
Default:
Options:
1 = “Adjust Freq”
4 = “Both-Frq 1st”
0 = “Disabled”
1 = “Adjust Freq”
2 = “Dyn Brake”
3 = “Both DB 1st”
4 = “Both Frq 1st”
RW 32-bit
Integer
374 Bus Reg Lvl Cfg
Bus Regulation Level Configuration
Selects the reference used to determine the bus voltage regulation level for the bus
voltage regulator and the reference used for the dynamic brake.
“Bus Memory” (0) – References are determined based on P12 [DC Bus Memory].
“BusReg Level” (1) – References are determined based on the voltage set in the bus
regulator level parameter P375 [Bus Reg Level]. If coordinated operation of the dynamic
brakes of a common bus system is desired, use this selection and set the P375 [Bus Reg
Level] to coordinate the brake operation of the common bus drives.
Default:
Options:
0 = “Bus Memory”
0 = “Bus Memory”
1 = “BusReg Level”
RW 32-bit
Integer
375 Bus Reg Level
Bus Regulation Level
Sets the “turn-on” bus voltage level for the bus voltage regulator and the dynamic
brake.
Units:
Default:
Min/Max:
V DC
P20 < 252V DC: 375
P20 = 252…503V DC: 750
P20 = 504…629V DC: 937
P20 > 629V DC: 1076
P20 < 252V DC: 375/389
P20 = 252…503V DC: 750/779
P20 = 504…629V DC: 937/974
P20 > 629V DC: 1076/1118
RW Real
ATTENTION : The drive does not offer protection for externally mounted brake resistors. A risk of fire exists if external
braking resistors are not protected. External resistor packages must be self-protected from over-temperature or the
protective circuit shown in Figure 4 on page 356
(or equivalent) must be supplied.
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