44 Main Features Emotron AB 01-3694-01r2
Fig. 47 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 addi-
tional pump. In this example pumps P5 and P6 will run at
maximum power if the inverter fails or is powered down.
Fig. 48 Example of "Fail safe" operation
P1 P2 P3
PM
FDU
MASTER
R:SlavePump3
R:SlavePump2
R:SlavePump1
DI:Pump1Feedb
DI:Pump2Feedb
DI:Pump3Feedb
other
drive
other
drive
other
drive
feedback
inputs
(NG_50-PC-6_1)
See menu:
[529] to [52H] Digital Input
[554] to [55C] Relay
P1 P2 P3 P4 P5 P6
PM
FDU
MASTER
R:SlavePump6
R:SlavePump5
R:SlavePump4
R:SlavePump3
R:SlavePump2
R:SlavePump1
(50-PC-7_1)
See menu:
[554] to [55C] Relays
[55D4] to [55DC] Mode
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