Chauvin Arnoux C.A 6454 Notice De Fonctionnement page 62

Pressing the or
Parameters accessible in selective earth measurement in live condition,
current):
Initial display
st
(1 press)
nd
(2 press)
rd
(3 press)
Pressing the or
4.2.5 CHARACTERISTICS
4.2.5.1 MEASUREMENT RANGES AND ACCURACY
Particular reference
conditions
Characteristics of the measurements:
Characteristics in "high current" mode ("tripping" mode
Charge duration : 300µs cycle
Display range
Specified
measurement
domain
Peak measuring
current between
90V and 280V
Peak measuring
current between
280V and 550V
Accuracy of the
impedance
measurement
Additional error
for Rearth
key once more causes a return to the initial display.
MORE
Initial
MORE
display
st
(1 press)
R
- - - -
E
I
Z
SEL
E SEL
R
- - - -
E
I
Z
SEL
E SEL
R
- - - -
E
I
Z
SEL
E SEL
R
- - - -
E
I
Z
SEL
E SEL
MORE
key once more causes a return to the initial display.
: nominal voltage of the installation = 90 to 550 V,
nominal frequency of use = 15.3 to 65 Hz,
resistance in series with voltage probe: < 100 Ω,
inductive part < 0.1 x the resistive part of the impedance measured,
resistance of the cable connected to terminal PE corrected,
contact voltage < 5V (potential of terminal PE with respect to the local earth).
0.20 – 1.99 Ω 2.00-19.99 Ω
1.06 to 3.25 A 0.90 to 3.25 A
1.27 to 2.73 A 1.20 to 2.71 A
10% 7 pt
MORE
nd
(2 press)
H
Z
U
LN
H
Z
U
LPE
H
Z
U
NPE
H
Z
U
P
40 Ω
20.00–39.99 Ω
0.79 to 2.83 A
1.13 to 2.57 A
5%
0,3 Ω
61
MORE
rd
(3 press)
R
L ALARM
U
F
R
L ALARM
U
F
R
L ALARM
U
F
R
L ALARM
U
F
):
400 Ω
40.0–399.9 Ω
0.24 to 2.47 A 0.03 to 0.76 A
0.55 to 2.42 A 0.08 to 1.18 A
7 pt 5% 5 pt
mode (high
MORE
th
(4 press)
R
∆
L
U
L
R
∆
PE
U
L
R
∆
N
U
L
R
P
U
L
4000 Ω
400–3999 Ω
5% 2 pt