Allen-Bradley PowerFlex 70 Reference Manual page 60

Bus Regulation
60
Table 3
Voltage Class DC Bus Memory
240 < 342V DC
> 342V DC
480 < 685V DC
> 685V DC
600 < 856V DC
> 856V DC
600/690V < 983V DC
PowerFlex 700 Frames
> 983V DC
5 & 6 Only
880
815
DB Turn On
750
DB Turn Off
685
650
509
453
320 360
If [Bus Reg Mode A], parameter 161 is set to "Dynamic Brak"
The Dynamic Brake Regulator is enabled. In "Dynamic Brak" mode the Bus
Voltage Regulator is turned off. The "DB Turn On" and turn off curves apply
(Table 3). For example, with a DC Bus Memory at 684V DC, the Dynamic Brake
Regulator will turn on at 750V DC and turn back off at 742V DC.
If [Bus Reg Mode A], parameter 161 is set to "Both-Frq 1st"
Both regulators are enabled, and the operating point of the Bus Voltage Regulator
is lower than that of the Dynamic Brake Regulator. The Bus Voltage Regulator
setpoint follows the "Bus Reg Curve 2" below a DC Bus Memory of 650V DC
and follows the "DB Turn Off " curve above a DC Bus Memory of 650V DC
(Table 4). The Dynamic Brake Regulator follows the "DB Turn On" and turn off
curves (Table 3). For example, with a DC Bus Memory at 684V DC, the Bus
Voltage Regulator setpoint is 742V DC and the Dynamic Brake Regulator will
turn on at 750V DC and back off at 742V DC.
If [Bus Reg Mode A], parameter 161 is set to "Adjust Freq"
The Bus Voltage Regulator is enabled. The Bus Voltage Regulator setpoint
follows "Bus Reg Curve 1" below a DC Bus Memory of 650V DC and follows
the "DB Turn On" above a DC Bus Memory of 650V DC
example, with a DC Bus Memory at 684V DC, the adjust frequency setpoint is
750V DC.
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
DB On Setpoint
375V DC
Memory + 33V DC
750V DC
Memory + 65V DC
937V DC
Memory + 81V DC
1076V DC
Memory + 93V DC
460 484 528 576
AC Volts
DB Off Setpoint
On – 4V DC
On – 8V DC
On – 10V DC
On – 11V DC
(Table 4). For