Chapter 5: Keypad Menu Items and Parameters
‘Current’ Sub-menu of ‘Advanced’ Menu (continued)
Low Current (‘Current’ sub-menu of ‘Advanced’ menu)
Range: P51/B4
Default: Off
Scaling: n/a
Type: R/W
The ‘Low Current’ menu item turns ‘On’ and ‘Off’ the ‘Low Current’ trip. A ‘Low Current’ trip
occurs when the current output measured by the unit falls below the level specified by the ‘Low
Amps Level’ parameter (P28) for a length of time specified by the ‘Low Amps Time’ parameter
(P29).
• Refer to “Low Current Protection 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’.)
Low Amps Level (‘Current’ sub-menu of ‘Advanced’ menu)
Range: 0.031 to 0.7813 x I
e
Default: 0.0938 x I
e
Scaling: n/a
Type: R/W
The ‘Low Amps Level’ menu item specifies the current level below which a ‘Low Current’ trip can
occur.
• Refer to “Low Current Protection 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’.)
Low Amps Time (‘Current’ sub-menu of ‘Advanced’ menu)
Range: 5 to 255 cycles
Default: 50 cycles
Scaling: n/a
Type: R/W
The ‘Low Amps Time’ menu item specifies the time that the current must remain below the level
specified by the ‘Low Amps Level’ (P28) before a ‘Low Current’ (P51/B4) trip occurs. The time is
specified in supply frequency cycles. The default value is 50 cycles (at the supply frequency).
[For 60 Hz: (50 cycles) ÷ (60 cycles/s) = 0.833s]
• Refer to “Low Current Protection Explanation Diagram”.
Low Current Protection Explanation Diagram
I
LOAD
I
LOW
1
Time
Low Amps Time = Min
2
Low Amps Time = Max
3
Notes
1.
2.
3.
I
LOW
= Low Amps Level.
If I
LOAD
drops below ‘Low Amps Level’, ‘Low Current’ is
set to ‘on’, and ‘Low Amps Time’ is set to minimum, then
the unit will trip as indicated by the short thick dotted line.
If ‘Low Amps Time’ is set to maximum and I
LOAD
rises above
‘Low Amps Level’ before ‘Low Amps Time’ has elapsed, then the unit will not trip.
(P-29)
(P-28)
(P51.B4)
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
5–34
Содержание Stellar SR44
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