TECO F33 Series, Instruction Manual, Page: 45 / 192

42 Main Features
Fig. 50 Feedback “Status” input
7.6.5 Fail safe operation
Some pump systems must always have a minimum flow
or pressure level, even if the frequency inverter is
tripped or damaged. So at least 1 or 2 (or maybe all)
additional pumps must keep running after the inverter
is powered down or tripped. This kind of “safe” pump
operation can be obtained by using the NC contacts of
the pump control relays. These can be programmed for
each individual additional pump. In this example
pumps P5 and P6 will run at maximum power if the
inverter fails or is powered down.
Fig. 51 Example of “fail safe” operation
See menu:
[529] to [52H] Digital Input
[554] to [55C] Relay
See menu:
[554] to [55C] Relays
[55D4] to [55DC] Mode