Notes on the power supply of the DR2020 for the dimensioning of the application
The DM2020 PS M power supply (L50 mm) can supply a nominal current of 54 Arms on the DC BUS line with a peak of 130 Arms on
the DC BUS line.
The DM2020 PSL power supply (L150 mm) can supply a nominal current of 128 Arms with a peak of 256 Arms on the DC BUS line.
The total number of DR2020 and DM2020 modules that can be connected at the same time is limited onl
y
b
y
these values according
to the machine c
y
cle.
The power supply is thermally protected from exceeding the maximum rms current that can be supplied by it.
The current that the power cable of the "chain" of the DR2020 is bound by the maximum current that the connector manufacturer
places as a constraint for the single power terminal; this value is 30 Arms.
This current limit value reflects the CE certification of the connector and of the DR2020 product.
The maximum section of the cable that the power terminal is able to house is equal to 4 mm
2
(AWG12) (terminals A-B-C-D).
The theoretical maximum number of DR2020 modules connectable in the chain is equal to about 20, considering to divide the 30
Arms on the auxiliary power supply 700 mA on the auxiliary power supply and 750 mA on the brake power supply (to be verified
according to the brake mounted on the motor) . However, it is advisable to check the voltage drop of the auxiliary power supply on the
last DR2020 module and then check that the voltage remains higher than 22.5 Volt. If necessary, split the supply line into two
separate lines.
The maximum cable cross-section at the signal terminals is 1 mm
2
(AWG18) (terminals 1 to 6) with maximum current of 1.2 A
It is always advisable to use a shielded cable also from the power supply in order to limit EMC emissions in the cabinet.
The overall cable length between the electrical panel and the last DR2020 module should remain within 50 meters; for longer
lengths, a functional check of the required configuration is advisable.
MAR2-E-191
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