Endress+Hauser FEC 22 Instructions De Mise En Service page 36

6 Additional Settings
Function
DC-PNP
1(+)
3
Probe
connected
covered
1(+)
3
Probe blocked
uncovered
1(+)
U 0 V
3
Power supply blocked
failure
Table 6.1
Setting
Fig. 6.4
Minimum/maximum fail-safe
36
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6.3 Minimum/maximum fail-safe mode
By using the minimum/maximum fail-safe switching feature, the FEC 22 can be used
in all applications where a fail-safe function is required.
Minimum fail-safe
AC-DPDT Red LED
1 2 3 7 8 9
relays energised
1 2 3 7 8 9
relays de-energised
7 8 9
1 2 3
relays de-energised
2x MIN
1x MIN
0x MIN
6.4 Switching delay
This function enables the switching delay time to be altered (factory-set value = 1.5 s)
so that the electronic insert can switch accordingly when the probe is covered or
uncovered.
Maximum fail-safe
DC-PNP
1(+)
3 1 2 3
blocked relays de-energised
1(+)
1 2 3
3
connected
1(+)
3
1 2 3
blocked
relays de-energised
MAX
MAX
MAX
1
7 3
1
MIN MIN
7 3
MAX MAX
Elektronic insert FEC 22
AC-DPDT Red LED
7 8 9
7 8 9
relays energised
7 8 9
Procedure
• Turn the rotary switch to
Position 5.
• When first delivered or
after a reset the extreme
right LED in the chain
lights up: maximum
fail-safe activated.
• Minimum and maximum
fail-safe mode can be
toggled by pressing the
left key.
• The setting can be read
off on the LED chain.
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