Function
14
2.6.5
Functional test switching output X12
Fig. 2.5: Monitor points for the functional test
After starting the functional test via the control input X10 (control impulse HIGH for 50…100 μs), the
charging control electronics should monitor the correct functionality of the digital output X12 at the
following points in time:
Monitor point related to falling edge e1 (X10)
M1
X12 disabled after 0.3 s
Monitor point related to falling edge e2 (X12)
M2
X12 enabled after 0.5 s
M3
X12 disabled after 1.8 s
M4
X12 enabled after 2.3 s
If X10 is maintained at LOW level at the end of the self test, X12 remains disabled until X10 has
reached HIGH level for at least 5 ms. Refer to the diagram in chapter 2.6.4 for more information.
Note:
The falling edge
„e2“
is used for the timing of the monitor points M2, M3 and M4.
Therefore, the end of the internal self test at t = 6.6 s may vary if the supply voltage
+U
s
= 12 V is unstable at the time of
e2
.
Control
input X10
Switching
output X12
Analog output X1
for reference only
Start of self test
Apply test current
19 mA / 400 Hz
time
t[s]
t = 0
4.6
Apply test current
37 mA DC
5.6
6.6
End of self test
= Point of measurement
of the charging electronics
75 μs
s
5
.
0
s
3
.
0
1. 8 s
2.3 s
e1
e2
≥ 530 ms
11 ms
M1
M2
M3
M4
≥ 180 ms
