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Baldor DSM S Series Installation Manual Page 18

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4-2 Input / Output MN1940
4.2 Motor power input
The DSM requires an unregulated DC power supply. The power supply current will depend
upon voltage and load, but will not exceed 2 A (DSMS17 / DSMS23) or 4 A (DSMS34).
Location
Flying leads (red and black), ‘P’ connector
Input voltage
range
+12 to +48 VDC (DSMS17)
+12 to +75 VDC (DSMS23, DSMS34)
Voltage ripple ±10%
Input current 2 A maximum (DSMS17 / DSMS23)
4 A maximum (DSMS34)
The maximum input voltage of the DSM includes motor back EMF, power supply
ripple and high line.
A characteristic of all motors is back EMF. Back EMF is a source of current that can push the
output of a power supply beyond the maximum operating voltage of the driver. As a result,
damage to the stepper driver could occur over a period of time. Care should be taken so that
the back EMF does not exceed the maximum input voltage rating of the DSM.
Cable length, wire gauge and power conditioning devices play a major role in the performance
of the DSM. The length of the DC power supply cable to a DSM should not exceed 15 m
(50 ft). If cabling of 15 m (50 ft) or longer is required, the additional length may be gained by
adding an AC power supply cable (see Figures 6 and 7). Power supply leads to the DSM need
to be twisted. If more than one DSM is to be connected to the same power supply, run
separate power and ground leads from the supply to each driver.
From
DC Supply
+24 V
0V
Connect shield to
earth ground at
supply end only
Shielded
twisted
pair
+
-
Pi type
RFI filter
Red
flyi ng lead
Black
flyi ng lead
To
DSM
Ferrite
sleev e
Cable length up to 15 m
500 μF
per
Amp
Figure 6 - Power supply connections, cable length less than 15 m
Connect shield to
earth ground at
supply end only
Shielded
twisted
pair
+
-
Pi type
RFI filter
Red
flyi ng lead
Black
flyi ng lead
To
DSM
Ferrite
sleev e
Cable length up to 15 m
From
AC
Supply
Pi type
RFI filter
500 μF
per
Amp
Transformer:
0-28VACRMSfor
48 VDC systems.
20 - 48 VAC RMS for
75 VDC systems
Full wave
bridge
rectifier
Figure 7 - Power supply connections, cable length more than 15 m
CAUTION
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