
34
SM32 • Instruction manual
Espaňol
Deutsc
he
Fr
ançais
Eng
lish
Italiano
3.3. Use of S2 switch
The S2 switch select the undervoltage threshold, based on the AC main voltage of
the converter
.
Dip S2.4
not used
Power supply voltage
S2.1
S2.2
S2.3
Threshold of the PS drop
460V -15% ... 480V+10% (Default)
ON
OFF
OFF
≤ 370 Vdc
400V
±
15%
OFF
ON
OFF
≤ 300 Vdc
( 230
±
10% )
OFF
OFF
ON
≤ 180 Vdc
3.4. Use of S3 switch
The S3 switch is able to set the precharge time for the DC-Link capacitors
(the
higher precharge time, the lower will be the current during the precharging
phase to the supplied capacitors).
Time (Seconds)
S3.1
S3.2
S3.3
S3.4
18 s
±
15%
OFF
OFF
OFF
OFF
11 s
±
15% (Default)
OFF
OFF
ON
OFF
7 s
±
15%
ON
OFF
OFF
OFF
4 s
±
15%
OFF
ON
OFF
OFF
2 s
±
15%
OFF
OFF
OFF
ON
Use the following way to select the precharge time:
1) Set all the switches in off position (18 seconds ramp time), use a current probe
able to detect a current peak ≤10ms
between the C or D terminal of the DC-
Link.
2) At this point read the measuring of the maximum peak current present on the
DC-Link during the precharging phase.
3) If the measured peak current is much lower than twice the value of the SM32
rated current, it is possible to select the switch for a lower ramp time (SW3.4 -
8- second ramp time). Go back to point 2.
Such operation will be repeated till the measured peak current is
equal or lower
than twice the value of the converter rated current.