Rockwell Automation Allen-Bradley LiquiFlo 2.0 - Page 87

Rockwell Automation Publication D2-3518-4 - January 2020 87
Parameter Descriptions Chapter 9
Sets the high limit for the speed reference after scaling is applied.
Sets the incremental amount of the output frequency (above Maximum Speed)
allowable for functions such as slip compensation. See Figure 38
.
Maximum Speed + Overspeed Limit must be ≤ to Maximum Frequency.
Figure 38 - Speed Limits
Sets a frequency at which the drive will not operate (also called an avoidance
frequency). Requires that both Skip Frequency 1...3 and Skip Frequency Band
(87) be set to a value other than 0.
ATTENTION: You are responsible for ensuring that driven machinery, all drive-
train mechanisms, and application material are capable of safe operation at the
maximum operating speed of the drive. Overspeed detection in the drive
determines when the drive shuts down. See Figure 38
. Failure to observe this
precaution could result in bodily injury.
83
Overspeed Limit
Range: 0.0...20.0 Hz [0.1 Hz]
Default: 10.0 Hz
Access: 1 Path: Speed Command > Spd Mode & Limits
See also: 55, 82
84
85
86
Skip Frequency 1
Skip Frequency 2
Skip Frequency 3
Range: -/+250.0 [0.1 Hz]
Default: 0.0 Hz
Access: 1 Path: Speed Command > Spd Mode & Limits
See also: 87
Allowable Output Frequency Range
Bus Regulation or Current Limit
V
o
l
t
a
g
e
Frequency
Allowable Output Frequency Range
Normal Operation
Allowable Reference Frequency Range
Frequency Trim due to
Speed Control Mode
Max Volts
Motor Volts
Break Volts
Start Boost
Run
0 Min
Speed
Motor
Hz
Max
Speed
Output
Freq Limit
Max
Freq
Break
Frequency
Overspeed
Limit