Fail-Safe Mode - Endress+Hauser nivotester FTC 420 Operating Instructions Manual

Nivotester FTC 420/421
Selection of fail-safe mode
Table 1
Truth table for fail-safe mode
Minimum Fail-safe mode
Fig. 7
Minimum fail-safe mode
Maximum Fail-safe mode
Fig. 8
Maximum fail-safe mode
28
The fail-safe mode is controlled by a bridge between terminals 12
and 13 of the Nivotester. The function can be taken from Table 2,
Fig. 7 and Fig. 8
Nivotester Maximum
bridge 12-13
FTC 420 Relay de-energises at
maximum and on
power failure. The red
LED lights
FTC 421 Relay de-energises at
maximum after selected
delay and on power
failure. The red LED
lights
Klemmen Level
12 - 13
Klemmen Level
12 - 13
1) Relay status on power failure. The green and red LED go out.
Installation
Minimum
no bridge 12-13
Relay de-energises at
minimum and on power
failure. The red LED
lights.
Relay de-energises at
minimum after selected
delay and on power
failure. The red LED
lights
Relay LED
1)
Relay LED
1)