Function
16
Fig. 2.7: Operating characteristics residual current monitoring module according to UL 2231-2
2.9 Fault detection and the resulting technical reactions
Note
:
In order to comply with the switching times required by the standard (CCID20),
the
switching time of the circuit-breaker
(incl. driver circuit)
must not
exceed 10 ms!
Type of fault
Detection
Response
Wire break in the
residual current transformer
Frequency measurement of the
measuring oscillator
X1 = 5.0 V
X12 = HIGH
Short-circuit in the residual cur-
rent transformer winding
Frequency measurement of the
measuring oscillator
X1 = 5.0 V
X12 = HIGH
Constant output voltage at the
measuring oscillator
Frequency measurement of the
measuring oscillator
X1 = 5.0 V
X12 = HIGH
Failure main oscillator
Reset by internal watchdog
X1 = 5.0 V or X1 = 0 V
X12 = HIGH
Supply voltage failure
Monitoring module connects and discon-
nects residual current monitoring
X1 = 5.0 V or X1 = 0 V
X12 = HIGH
Open collector output
constantly at LOW level
Self test to check whether output X12
switches to HIGH for 4.6 s when supply
voltage is connected; for details about
time T4 refer to page 12
Charging control electronics
detects fault after connecting to
the supply voltage
Analogue output X1 constantly
at LOW level
Output voltage outside the permissible
voltage range
Disconnection by charging con-
trol electronics
Storage cell of the computer
system defective
Detection by memory self test
X1 = 5.0 V
X12 = HIGH
Loss of return addresses from
subprograms
Response of internal watchdog
X1 = 5.0 V
X12 = HIGH
t [ms]
I
Δ
n
[mA]
20
100
10
0
0
300
90
990
t ≤
( )
I
Δ
n
20
1.43
– 10 ms
