cable and the motor cable of the fixed speed pump.
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 3 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). Then parameter AP15 must be
changed for each “slave” frequency converter. The
first slave frequency converter must be set as
“SLA1”, and the second slave frequency converter
must be set as “SLA2”.
For the right behavior of the booster set it is
recommended to switch off and switch on all the
frequency converter.
This configuration define an address for each
frequency converter, if not correctly configured,
cascade mode will not work properly.
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
if, in cascade mode, the frequency
converter which is connected the float
switch is failure, the float switch cannot
shut off the pumps.
Electrical connection
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
4.93.413.3
+
-
4.93.413.7
+
RA 100
-
4.93.413.4
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