CIRCUTOR GETEST Series - Manual (Page 11)

11 Instruction manual
Getest
8.- Type the Maximum Defect Current (16) in order to calculate the step
and contact voltage. Select to measure with a 1K resistor (15), if required.
Step and contact voltages are calculated using this formula:
If erratic voltage is lower than 10% of injected voltage
º 0
º 0
max
I
I V
V
nt defectcure
×
=
If erratic voltage is higher than 10% of injected voltage
º 0 2
º 180 º 0
max 2
2 2
I
I
V
V V
V
ent defectcurr
erratics
× −
+
=
Note: erratic voltage is automatically measured, warning the user in case of value over 50V AC
9.- Press “Start” to initiate the sequence. The sequence consists in:
a) Warning alarm
b) Connecting current output contactor
c) Measuring erratic voltage
d) Test at 25VAC
e) Apply voltage to reach required current
f) Increase voltage if current not reached
g) Apply current in 180º phase
h) Display results
A warning or error will appear if:
-
contactor fails
- erratic voltage is over 50VAC
- output is short-circuited
- resistance found is higher than 120 Ohms
- do not have enough power for reaching requested current for the
measured ground resistance
- cannot reach requested current. Possibility to interpolate results
- mains supply drops when applying the current (too high mains
wiring impedance)
10.- Display results on “DISPLAY” tab (19)
11.- Results can be saved to a file, by pressing the “Save” button, or by
using the pop-up menu “File” (21)