NHP TemBreak PRO P - Commissioning; LTD Adjustments

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TemBreak PRO P_BE-UM-001-EN V1.3.0
Commissioning
LTD Adjustments (I
r
, t
r
)
The LTD protection is configured by the I
r
and t
r
adjustment rotary dials, which is performed as follows. Refer to Protection Settings – Long Time Delay
Protection (LTD) section for further detail on setting I
r
and t
r
Action
Note / Illustration
1
Turn the MCCB to the OFF Position
Open the transparent flap to access the max l
r
adjustment
dials
2
Using a PH1, PH2 or PZ2 size screwdriver, rotate the I
r1
adjustment dial to the maximum scale value of I
r
in Amperes.
3
If required, turn the I
r2
fine adjustment dial to the required
percentage of the maximum scale I
r1
as configured in the
previous step.
NOTE: To turn off LTD protection, set I
r2
to the OFF position.
This will also disable STD protection and the OCR will be set
as INST protection only.
See INST Protection Only Setting.
4
Set the time delay by rotating the t
r
dial to the required value
in seconds.
WARNING: Before applying power to the MCCB for the first time, an initial inspection must be performed.
WARNING: Risk of nuisance tripping.
Only qualified personnel are to set the protection levels. Failure to respect these instructions may cause death,
serious injuries or equipment damage.