SIPLUS PSU (6DL3500-8BA)
SIPLUS PSU Power Supply Unit
A5E00854207E
24 of 30
Copyright (C) Siemens AG 2018
V 8.00 released
2018-05-03
8 Maintenance and Diagnosis
8.1 Self-Test Functions
For the protection of the Smart-FET-transistors each of the 20 supply branches is equipped with an
electronic shut-down at very high short-circuit currents. This electronic shut-down is activated when
the respective channel switch is in the “OFF” position and its functioning is supervised. A fault is indi-
cated with a red continuous light of the channel LED. In addition - depending on the appeared fault –
a collective status signal is provided at the signaling outputs MELD (active HIGH) and MELD_N (ac-
tive LOW). See also chapter 8.2 “Malfunctions”
A failure of the electronic shut-down can cause a destruction of the Smart-FET- transistor in case of a
short circuit.
8.2 Malfunctions
LED -
display
State of
operation
Switch
position
Fuse
Output
condition
(X1 – X20)
MELD
(X21)
MELD_N
(X21)
Reset
condition
red
„FAULT“
ON
Melted
High
impedance
High
Low
Fuse blown:
remove short
circuit, replace
fuse
red
„FAULT“
ON
OK
High
impedance
High
Low
Electronic
shut-down:
clear short
circuit, switch
off and on
again
green
„OFF“
OFF
OK
DC 24 V
Low
High
short circuit of
Smart-FET:
unit replace-
ment
Table 2: Fault diagnosis
Other possible conditions of the LED displays are described in chapter 4.7 “Signaling Scheme”