Function
10
2.4 Analogue voltage output X1
The r.m.s. value of the currently measured residual current is available at X1 as a proportional output
voltage.
If the residual current monitoring module detects values outside the measuring range, the analogue
output X1 will be set to 4.85 V. As soon as the residual current drops below 10 mA, the output X1 will
still remain at 4.85 V for approx. 1.2 s before the currently measured value will be displayed.
Therefore, the shutdown can be reliably evaluated by the charging control electronics.
Output voltages < 150 mV or > 4.85 V signal a short-circuit, an interruption or a possible fault of the
residual current module. For details about fault detection, refer to page 16.
2.5 Switching output X12
When values are outside the measuring range (
I
Δn
≥ 30 mA ) or a fault is detected by the monitoring
module, the switching output X12 will be disabled and signalled by the open collector output X12.
Fig. 2.2: Open collector
Only when the measured value of the residual current falls below 10 mA for a period of 1.2 s, the
switching output X12 will be enabled again by activating the transistor (LOW level at X12).
In order to check the switching capacity of the open collector output X12, a functional test according
to chapter 2.6.5 can be initiated via the control input X10.
2.6 Control input X10
2.6.1
Cyclical self test
Before each charging cycle, a self test has to be activated (reset with subsequent calibration) by the
charging control electronics via the input X10. This requirement can only be met when sufficient
supply v
U
s
/ -
U
s
is available (> 11 V).
The sequence of the measurement is described in chapter 2.6.4. During the calibration process, also
the digital output X12 switches. The cyclical self test is used to check the measuring function of the
device. This is a measure to ensure that the protective function is guaranteed.
X12
