Use Of S2 Switch; Use Of S3 Switch - gefran SM32 Bedienungshandbuch

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
460V -15% ... 480V+10% (Default)

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).
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
2) At this point read the measuring of the maximum peak current present on the
3) If the measured peak current is much lower than twice the value of the SM32
Such operation will be repeated till the measured peak current is equal or lower
than twice the value of the converter rated current.
34
Power supply voltage
400V ±15%
( 230 ±10% )
Time (Seconds)
18 s ±15%
11 s ±15% (Default)
7 s ±15%
4 s ±15%
2 s ±15%
able to detect a current peak ≤10ms between the C or D terminal of the DC-
Link.
DC-Link during the precharging phase.
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.
SM32 • Instruction manual
S2.1 S2.2 S2.3
ON OFF OFF
OFF ON OFF
OFF OFF ON
S3.1 S3.2 S3.3 S3.4
OFF OFF OFF OFF
OFF OFF ON OFF
ON OFF OFF OFF
OFF ON OFF OFF
OFF OFF OFF ON
Threshold of the PS drop
≤ 370 Vdc
≤ 300 Vdc
≤ 180 Vdc