Toshiba 18 - 1250 A - Manual (Page 54)

TE Series Digital Solid State Soft Starters 18 – 1250A
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5.6.8 Current and Ground Fault Protection Features
F040 – F050 set extended protection features that may be used in the
TE Series starter. Percentages shown are all based automatically upon
the Motor FLA setting from F001 (except Ground Fault, F046). No
additional calculations are necessary.
ƒ NOTE:
All of these features are disabled at the factory and must be
enabled via user programming as follows:
F040 = Current Imbalance Trip
Factory Setting = 0 (Disabled)
Range = 5 - 30% or 0 (Disabled)
Use to set the trip level for when current imbalance between
any two phases exceeds this amount for the time specified with
F041.
F041 = Current Imbalance Trip Delay
Factory Setting = 2 seconds
Range = 1 - 20 seconds
Provides a time delay to prevent nuisance trips from short-
duration transients. Using default settings, if the difference in
output current between two phases exceeds 10% of FLA for
more than 2 seconds, the starter will trip.
F042 = Over Current Trip / Shear Pin Trip
Factory Setting = 0 (Disabled)
Range = 100 - 300%, 0 (Disabled)
When a value other than 0 is entered for F042, the starter will
trip when the output current of any phase exceeds the amount
set and the time specified in F043. This is also referred to as a
“Shear Pin Trip” and can be used to protect mechanical
components from breaking due to jammed loads.
F043 = Over Current Trip Delay
Factory Setting = 1 second
Range = 1 - 20 seconds
Provides a time delay to prevent nuisance trips from short-
duration transients. For example using default settings, if the
output current of any phase exceeds F042 for more than 1
second, the starter will trip.
F044 = Under Current Trip
Factory Setting = 0 (Disabled)
Range = 10 - 90%, or 0 (Disabled)
When a value other than 0 is entered for F044, the starter will
trip when the output current of any phase drops below the
amount set, and the time specified in F045. This fault condition
is often referred to as a “Load Loss Trip” and can be used to
detect a broken shaft, V belt or other mechanical drive system
component. In pumping applications, this can be used as a
“Loss of Prime” trip.
F045 = Under Current Trip Delay
Factory Setting = 2 seconds
Range = 1 - 60 seconds
Provides a time delay to prevent nuisance trips from short-
duration transients. Using default setting, if the output current of
any phase drops below F044 for more than 2 seconds, the
starter will trip.
F042: O. C.
Trip Setting
Over Current Trip
Cu
rr
e
n
t
Time
Figure 5.6.8.a:
Ov e r Curre nt Trip
F043: O.C.
Trip Delay
Running
Current
F044: U.C.
Trip Setting
Under Current
Trip
Cu
rr
e
n
t
Time
Figure 5.6.8.b:
Unde r Curre nt Trip
F045: U.C.
Trip Delay
Normal
Running
Current