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The connection with the power supply
must be made with interpositions of
magnetothermal bipolar switches with
proper size and with a type A differential
switch protected against untimely
activation and with threshold of
intervention of 30 mA.
The use of the cascade mode with 1 fixed
speed pump not allow connection of a
remote alarm or a control panel remote
alarm RA100.
7.4.5. Cascade mode
programming
Pressure boosting sets with 2 variable speed
pumps.
After the connection, change the AP09 parameter
from OFF to UU for both frequency converters,
define which frequency converter will work on
master mode and for this frequency converter
change the AP10 parameter from SLA (slave) to
MAS (master).
Pressure boosting sets with 1 variable speed
pump and 1 fixed speed pump (single-phase).
After the connection, change the AP09 parameter
from OFF to UF for the frequency converter.
7.4.6. Cascade
mode
plant
starting
Check that all the cascade mode parameters are
with the desired values, the parameters that can
change the cascade mode operation are:
AP16
Cascade mode start fall pressure set-up
AP17
Cascade mode restart delay
AP18
Cascade mode fall pressure limit set-up
To do the plant starting follow the instructions
under paragraph 12.
7.5. Float switch connection
To connect a float-switch connect to the
connections 8-9 the cables of the float switch. The
float switch can be used for:
- dry-running protection, AP12 parameter set
on 1 value (nO),
Electrical connection
The provisions are refered to two wires
float switch in NC configuration.
7.6. Remote alarm connection
To connect a remote alarm connect to the
connections 10-11 the possible remote alarm or
the control panel for remote alarm RA100.
The remote alarm can be used to signal:
- error on the frequency converter (see
paragraph 9.3.) (nO).
- the frequency converter is running (nC).
Operating limits: 250 Vac, 450 mA
maximum resistive current.
Electrical connection
8. Dry-running protection
The frequency converter is equipped with a dry-
running protection for the pumps. When the
pressure on the system remain for a time higher
than the dry-run time (AP05) lower than value of
the dry-run pressure (AP07) the protection system
stop the pump. It is possible the use of an external
float switch for the dry-running protection (see
paragraph 7.5.). In this case the pumps restart
when the minimum working level is reached.
+
RA 100
-
4
.9
3
.4
1
3
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4
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