Fig. 7-30:
Action logic of relay
Δp = p
cmd
- p
actual
When the pump logic has been switched between Vg
min
or Vg
max
, the control
parameter is automatically changed:
For Vg
max
:
●
Vg = Vg1 (two points) or Vg = Vg1 + Vg2 (double pump)
●
p/Q controller parameter set [0], e.g. [F3.10]...[F3.19]
For Vg
min
:
●
Vg = Vg2 (two points) or Vg = Vg1 (double pump)
●
p/Q controller parameter set [1], e.g. [F3.30]...[F3.39]
When the two points / double pump control is active, the p/Q pa‐
rameter selection function via digital input (F2.16...F2.24) is deac‐
tivated. F4.29 only reverse output signal through relay, it does not
influence the control parameter switching.
Application example:
24V power supply, normal open relay terminal Ta, Tb and Rexroth two points
pump controller are connected in series. [F4.28] is set to ''0: Two points
pump'' and [F4.29] is set to ''0: Positive''. When lΔpl and N
th
satisfy the condi‐
tion of switching logic, the relay will be triggered, and in sequence the pump
controller will be switched to minimal displacement.
F2.40 = 2;
F4.03 Bit3 = 1;
F4.28 = 0;
F4.29 = 0;
F4.30 = Vg1;
F4.31 = Vg2;
F4.32 = 15;
F4.33 = 10;
F4.34 = 0.9;
Bosch Rexroth AG
DOK-SYTROX-FCP5020****-IT01-EN-P
104/201
Frequency-controlled pump drive system Sytronix FcP 5020
Commissioning of Sytronix FcP 5020 System
