Commissioning
Instruction manual 91/104 V9.2
Nominal Voltage
Minimum Maximum
Units of measure
24
440
Volts (RMS)
Set the nominal motor voltage as read on the plate at the type of connection (star or triangle) achieved. If the motor does not differen-
tiate the two voltages, the following formula can be used to calculate the missing data:
V
T
=
V
S
3
V
T
=Voltage for Triangle Connection
V
s
=Voltage for connection to Stella
Continuous service Current
Minimum
Maximum
Units of measure
Corrente serv
.
cont
.
convertitore
10
Corrente serv
.
cont
.
convertitore
Amperes (RMS)
Set the motor ‘s continuous service current as read on the plate at the type of connection (star or triangle) made. If the motor does not
differentiate the two currents, the following formula can be used to calculate the missing data:
I
T
=
I
S
⋅
3
I
t
=Current for connection to Triangle
I
s
=Current for connection to Star
Maximum Current
Minimum
Maximum
Units of measure
Continuous service Current
2
⋅
Nominal Current
o
Corrente picco convertitore
Amperes (RMS)
Set the maximum current that the motor can withstand during its operation as indicated on the plate or by the motor manufacturer. Too
high a value can cause the motor to overheat and cause a failure.
Note that the above parameter is set automatically equal to the “Continuous service Current" whenever the latter parameter is
changed.
Nominal Frequency
Minimum Maximum
Units of measure
10
499,9
Hz
Set the rated motor frequency as indicated on the plate (usually between 50 and 60 Hz).
Normally this value is written on all motor plates, but if it is not present it is possible to calculate it using other data always reported
on the motor: rated speed (max load), number of motor poles, sliding. In case of need, we recommend that you contact our technical
office by providing all available data to help you calculate the missing data that is indispensable.
Example:
The motor plate indicates the Nominal Speed (unladen) = 1590 RPM and the number of motor poles = 4. The nominal fre -
quency can be calculated with the following formula:
f
=
n
⋅
Pm
120
f = Nominal frequency [Hz]
n = Nominal speed (empty) [RPM]
Pm= Motor pole
By substituting the plate data in the formula you get that the nominal frequency is 53 Hz.
Motor pole
Minimum Maximum
Units of measure
2
16
n.
Set the number of poles of the motor as indicated on the plate.
If this data is not written on the motor plate, it can be calculated from the rated frequency and rated speed (if indicated on the motor
plate) using the following formula:
X
=
f
⋅
120
n
n = Nominal speed [RPM]
f = Nominal frequency [Hz]
X = Number to be rounded to the nearest equal to calculate the number of poles
Example:
The motor plate shows the following data: Rated speed at maximum load = 1532 RPM, Nominal frequency = 53 Hz. With
the above formula X = 4,15 is calculated and rounded to the nearest integer we get that: number of poles = 4.
36
Alter Elettronica s.r.l.
