HT Italia IMP57, User Manual, Page: 31 / 39

IMP57
EN - 29
6.4.2. Prospective Short Circuit Current Calculation
The instrument calculated the Prospective short circuit current as:
HOT
PE P
NOM
PE P
MIN PE P MIN
Z
U
C I



 
Fault to Ground Minimum Prospective Short Circuit Current
Where:
2 2
) 5 . 1 (
PE P PE P
HOT
PE P
X R Z
  
  
and
Voltage U
NOM
C
MIN
230V-10% < Vmeasured < 230V+ 10% 230V 0,95
230V+10% < Vmeasured < 400V- 10% Vmeasured 1,00
400V-10% < Vmeasured < 400V+ 10% 400V 0,95
6.4.3. Run the Test
When the IMP57 has been connected according to paragraph 5 and the MASTER
instrument has been set according to paragraph 6.4.1 and 6.4.2, you can run the Test by
means the START/STOP button.
During the test the STATUS LED will get Orange colour and when the Test is completed
the results will be shown on instrument display.
6.4.4. Test result analysis
After the Test the instrument will show a screen as indicated below:
m

V A
Phase – Protection
conductor Impedance (m

)
Prospective Short
Circuit Current
Voltage Measured
Positive result of the test
 You can save these results by pressing the SAVE button twice .
6.4.5. Anomalous results
 The message " NOT READY " indicate
that IMP57 doesn't reply to RS232
commands of the MASTER instrument.
Please check if the MASTER instrument
is connected to IMP57 through
C232NG1 cable and the STATUS LED
is green.
V
m

A