Shear Pin Fault - Allen-Bradley PowerFlex 70 Reference Manual
Adjustable frequency ac drive
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Table of Contents
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Shear Pin Fault
Shear Pin Fault
This feature allows the user to select programming that will fault the drive if
the drive output current exceeds the programmed current limit. As a default,
exceeding the set current limit is not a fault condition. However, if the user
wants to stop the process in the event of excess current, the Shear Pin
feature can be activated. By programming the drive current limit value and
enabling the electronic shear pin, current to the motor is limited, and if
excess current is demanded by the motor, the drive will fault.
Configuration
The Shear Pin Fault is activated by setting Bit 4 of [Fault Config 1] to "1."
238 [Fault Config 1]
Enables/disables annunciation of the listed faults.
x
x
x
0
0
15
14
13
12
11
Bit #
Factory Default Bit Values
The programmable current limit [Current Lmt Sel] should also set to
identify the source of the current limit value. If "Cur Lim Val" is selected,
then [Current Lmt Val] should be set to the required limit value.
147 [Current Lmt Sel]
Selects the source for the adjustment of
current limit (i.e. parameter, analog input,
etc.).
A separate fault (Shear Pin Fault, F63) dedicated to the Shear Pin feature,
will be generated if the function is activated.
Application Example
In some applications, mechanical hardware can be damaged if the motor is
allowed to develop excess torque. If a mechanical jam should occur,
shutting down the system may be the only way to prevent damage. For
example, a chain conveyor may be able to "hook" itself, causing a jam on
the conveyor. Excess torque from the motor could cause chain or other
mechanical damage.
By programming the Shear Pin feature, the user can cause the drive to fault,
stopping the excess torque before mechanical damage occurs.
1 =Enabled
x
0
0
0
1
0
0
1
x
1
0
0 =Disabled
10
9
8
7
6
5
4
3
2
1
0
x =Reserved
* Vector firmware 3.001 & later
Default:
0
Options:
0
1
2
"Cur Lim Val"
146
149
"Cur Lim Val"
"Analog In 1"
"Analog In 2"
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