Endress+Hauser FEC 22 - Minimum;maximum fail-safe mode; Switching delay

6.3 Minimum/maximum fail-safe mode
Function 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.
Setting
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.
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.
Minimum fail-safe Maximum fail-safe
DC-PNP AC-DPDT Red LED DC-PNP AC-DPDT Red LED
Probe
covered
connected
relays energised blocked relays de-energised
Probe
uncovered
blocked relays de-energised
connected
relays energised
Power supply
failure
blocked
relays de-energised
blocked
relays de-energised
Table 6.1
1(+)
3
1 2 3 7 8 9
3
1(+)
1 2 3
7 8 9
3
1(+)
1 2 3
7 8 9
1(+)
3
1 2 3 7 8 9
U0V
3
1(+)
1 2 3
7 8 9
3
1(+)
1 2 3
7 8 9
1
3
7
MAXMIN
MAX
MAX
MIN
MIN
1x
2x
0x
7
3
1
MIN
MAX
MIN
MAX
BA160Y66
Fig. 6.4
Minimum/maximum fail-safe
6 Additional Settings Elektronic insert FEC 22
36 Endress+Hauser