72 Main Features CG Drives & Automation 01-7491-01r0
7.6.2 Fixed MASTER
This is the default setting of the Pump Control. The AC
drive controls the Master pump which is always running.
The relay outputs start and stop the other pumps P1 to P6,
depending on flow/pressure. In this configuration, a
maximum of 7 pumps can be controlled, see fig. 80. To
equalize the lifetime of the additional pumps it is possible to
select the pumps depending on the run time history of each
pump.
Fig. 80 Fixed MASTER control.
7.6.3 Alternating MASTER
With this function the Master pump is not fixed to the AC
drive all the time. After the AC drive is powered up or
started again after a stop or sleep mode the Master pump is
selected via the relay set to function Master Pump. section
7.6.6, page 75 shows a detailed wiring diagram with 3
pumps. The purpose of this function is that all pumps are
used equally, so the lifetime of all pumps, including the
Master pump, will be equalized. Maximum 6 pumps can be
controlled with this function.
Fig. 81
Alternating MASTER Control.
7.6.4 Feedback 'Status' input
In this example, the additional pumps are controlled by an
different kind of drive (e.g. soft starter, frequency inverter,
etc.). The digital inputs on the I/O Board can be
programmed as a "Error" input for each pump. If a drive
fails, the digital input will monitor this and the PUMP
CONTROL option will not use that particular drive
anymore and automatically switch to another drive. This
means that the control continues without using this (faulty)
drive. This function can also be used to manually stop a
particular pump for maintenance purposes, without
shutting down the whole pump system. Of course the
maximum flow/pressure is then limited to the maximum
pump power of the remaining pumps.
NOTE: The pumps MAY have different powers,
however the MASTER pump MUST always be the
largest.
P1 P2 P3 P4 P5 P6
PM
FDU
MASTER
R:SlavePump6
R:SlavePump5
R:SlavePump4
R:SlavePump3
R:SlavePump2
R:SlavePump1
(NG_50-PC-4_1)
See menu:
[393] Select Drive
[39H] to [39N] Run Time 1 - 6, Pump
[554] to [55C] Relays
NOTE: The pumps MUST have all the same
power.
P1 P2 P3 P4 P5 P6
FDU
MASTER
R: SlavePump6
R: SlavePump5
R: SlavePump4
R: SlavePump3
R: SlavePump2
R: SlavePump1
(NG_50-PC-5_1)
R: MasterPump1
R: MasterPump2
R: MasterPump3
R: MasterPump4
R: MasterPump5
R: MasterPump6
See menu:
[393] to [396]
[553] to [55C]
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