Instruction manual V 2.3
11
PWM 230 - PWM 400 - PWM 400/7.5
Instruction manual
Figure 2: Power supply terminal
If the installed electro pump’s power equals the PWM’s maximum allowed one, the power cord wires’ section
should be greater than a given value, depending on the cord’s length. Table 3 shows the minimum wires’
section as a function of the cord’s length.
Length (meters)
Minimum section (mm
2
)
0 – 30
2.5
30 – 60
4
Table 3: Minimum section as a function of power cord’s length for PWM 230
If the installed pump’s power is lower than the maximum allowed one, the power cord wires’ section can be
reduced proportionally to the power decrease (for example if the total power halves, the section will be
halved).
PWM 230 already provides internal current protections. If a thermal magnetic circuit breaker is installed, its
rated current must be 16 A.
Connection of the power line to PWM 230 must include a ground wire whose impedance must comply with
the safety regulation in force in the country of use. The total grounding resistance must not exceed 100 Ohm.
2.2.2
Electrical connection to the electro pump for PWM 230 device
The supply voltage of the motor of the installed electro pump
must be 230V three-phase.
The current absorbed by the pump connected to PWM230 must
not exceed 9,3A rms.
The three-phase motors with rated supply voltages that differ
from 230V, cannot work with PWM 230. Check the motor
connection rating values to fulfil the condition above.
Three-phase electric machines generally have two types of
connection as shown in Figure 3 and Figure 4.
The delta connection is typically the one used to work at
230V (see Figure 4).
Normally PWM devices are equipped with a cable for connection to the motor. The connection between
PWM 230 and the electro pump is made with a 4-wire cable (3 ground).
For versions not equipped with the cable mentioned above the connection is made on the 4-ways terminal
“J4” with “PUMP” silk-screened on it and an arrow at the output (see Figure 5). The section of the wire must
be at least 1.5 mm
2
for any length.
Figure 3: Wrong connection
Figure 4: Right connection
