Pentair NOCCH, Manual, Page: 32 / 128

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3. THERMAL BLOCKAGE
1. AUTOMATIC OPERATION
MANUAL WORKING - SEE FIG.9
• In case one the thermal relays
protecting against overcharge or
lack of power supply of the motor
operating directly (not controlled by
the inverter) is tripped, in addition of
the message on the display, the red
LED (4) ANOMALY is lit (the same of
INVERTER BLOCKAGE)
• The motor pumps are operated by an
SFC card on pressure levels
• In this case it is necessary to cut the
voltage off the switchboard and open
the protective fuse-holder of the
inverter (see fig.3)
• In this case the programs
automatically excludes the pump or
pumps that generated the event and
the group operates regularly, even if
with a reduced rating
• It is therefore necessary to increase
the value of STOP THRESHOLD
following the indications reported
in chap.6 – starting up in point
Modification of the working pressure
established
• In order to reset, after having
verified the accidental origin of the
overcharge, press the resetting
lever situated on the thermal relays
concerned
• The value of SET POINT represents
the startup pressure of the first
pump. The one of STOP THRESHOLD
indicates the value of stop pressure of
the last pump. The difference between
these values must be of at least 1 bar.
GB
EXCLUSION OF THE INVERTER
CHAPTER 9
In case of breakdown of the inverter, while waiting for the appropriated repair intervention, the group can operates automatically or
manually:
If tanks under pressure connected to the delivery collector of the group have a sufficient volume, the installation will get back in
function in the pressure range established (one of pumps, the one that should have been started up controlled by the inverter will
remain in stop). If one observes an abnormal operation (frequent starts up and stops of pumps) it will be necessary to modify the
pressure values established for every pump as described in point 2) of Chap.7.
The selectors situated inside the switchboard makes it possible to operate all pumps with exclusion of the inverter, the SFC
keyboard and the card YES. If the selector is in vertical position (EXCLUSION: the related pump cannot operates).
Example
SET POINT 5.0 bar
STOPTHRESHOLD 6,0 bar
WARNING
WARNING: in this case the pumps can operate only if the water is pumped by the user. The working of pumps without
pumping may cause damage to pumps and the group.