VMX
2
Series Digital Solid State Soft Starter User Manual
49 |
P a g e
F046 = Ground Fault Trip
Factory Setting = 0 (Disabled)
Range = 5 - 90% of CT value, or 0 (Disabled)
When a value other than 0 is entered in
F046
, the starter will trip if
current to ground exceeds this percentage of the unit CT value. The CT
value is shown in
F074
, (see section 5.6.12). This value is different from
the Unit Rating or FLA setting. Following are two examples of Ground
Fault current settings.
Example
:
To calculate the ground current trip value in amps, divide the setting of
F046
by the CT Value in
F074
then multiply by 100. Example using
VMX2-210-BP: The value in F046 = 20, the CT value in
F074
= 250.
So, 20/250 = 0.08 x 100 = 8A.
If you have a desired trip value in amps and need to determine the
percentage value for
F046
, simply divide the desired trip ampere value
by 100, then multiply that times the value in
F074
.
Example:
210A starter desired Ground Fault Trip Level is 8A, The CT
value is
F074
is 250. Then, 8 ÷ 100 = 0.08 then x 250 = 20% in F046.
F047 = Ground Fault 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 Ground Fault
current exceeds the level set in
F046
for more than 2 seconds,
the starter will trip.
CAUTION:
This method of Ground Fault sensing may not provide adequate
equipment protection in resistance-grounded systems. We
recommend providing external GF protection using a core
balanced Zero Sequence CT for those types of applications.
Consult factory for additional assistance.
