Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 62)

62 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 1 Drive Configuration
P360 [FS Speed Reg Kp]
Sweep mode - Sets level the current must drop below. A larger value requires less
change in current to indicate detection.
Enhanced mode - It’s the Kp in the speed regulator used in the detection process.
Used along with P357.
P361 [FS Excitation Ki]
Sweep mode - Integral term used to control the initial output voltage
Enhanced mode - Integral term used in the current regulator, which controls the
motor excitation if the detection process deemed it necessary to excite the motor.
P362 [FS Excitation Kp]
Sweep mode - Proportional term used to control the initial output voltage
Enhanced mode - Proportional term used in the current regulator, which controls
the motor excitation if the detection process deemed it necessary to excite the
motor.
P363 [FS Reconnect Dly]
Delay time used between the issued start command and the start of the reconnect
function. This is mainly used for power loss situations so the restart doesn't occur
too quickly causing possible faults.
P364 [FS Msrmnt CurLvl]
There are two different measurement methods used when in Enhanced mode. If
this parameter is set to zero the second method is cancelled and reconnect is
attempted after the first measurement. Any other level change in this parameter
could help the second measurement routine. Usually a higher number helps
more.
Cooling Tower Fans Application Example
In some applications, such as large fans, wind or drafts can rotate the fan in the
reverse direction when the drive is stopped. If the drive were started in the normal
manner, its output begins at zero Hz, acting as a brake to bring the reverse
rotating fan to a stop and then accelerating it in the correct direction. This
operation can be very hard on the mechanics of the system including fans, belts
and other coupling devices.