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Chapter 5: Keypad Menu Items and Parameters
‘Current’ Sub-menu of ‘Advanced’ Menu (continued)
Shearpin (‘Current’ sub-menu of ‘Advanced’ menu)
Range: P51/B3 Default: On Scaling: n/a Type: R/W
The ‘Shearpin’ menu item turns ‘On’ and ‘Off’ the ‘Shearpin’ trip. The ‘Shearpin’ trip is intended
to catch transient current peaks which exceed the value specified in the ‘Shearpin Level’ parameter
for a time that is specified in the ‘Shearpin Time’ parameter (P33).
• Refer to “Shearpin Explanation Diagram”.
«•» This parameter bit is not available in Bypass Operation unless a user-supplied external current
transformer is installed. (Refer to P18/B2, ‘Auto Bypass’.)
Shearpin Level (‘Current’ sub-menu of ‘Advanced’ menu)
Range: 0.5 to 5 x I
e
Default: 3.125 x I
e
Scaling: n/a Type: R/W
The ‘Shear Level’ parameter holds the level in Amps at and above which a ‘Shearpin’ trip
condition will exist.
• Refer to “Shearpin Explanation Diagram”.
«•» This parameter is not available in Bypass Operation unless a user-supplied external current
transformer is installed. (Refer to P18/B2, ‘Auto Bypass’.)
Shearpin Time’ (‘Current’ sub-menu of ‘Advanced’ menu)
Range: 5 to 255 cycles Default: 100 cycles Scaling: n/a Type: R/W
This parameter holds the time in supply frequency cycles that a ‘Shearpin’ trip condition must exist
before a trip occurs. The default value is 100 cycles (at the supply frequency).
[For 60 Hz: (100 cycles) ÷ (60 cycles/s) = 1.67s]
• Refer to “Shearpin Explanation Diagram”.
Shearpin Explanation Diagram
(P51.B3)
(P-32)
(P-33)
I
LOAD
Time
I
SHEARPIN
1
Shearpin Time
2
Notes
1. I
SHEARPIN
= Shearpin Level.
2. If I
LOAD
exceeds I
SHEARPIN
for a time equal to ‘Shearpin
Time’, and ‘Shearpin’ is set
to ‘on’, then the unit will trip
as indicated.
The Shearpin trip is automatically turned off during starting and stopping.
See also the Special Case in the Overload Level entry.
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
5–36