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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 |
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Input voltage | +12 to +48 VDC (DSMS17) |
range | +12 to +75 VDC (DSMS23, DSMS34) |
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Voltage ripple | ±10% |
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Input current | 2 A maximum (DSMS17 / DSMS23) |
| 4 A maximum (DSMS34) |
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The maximum input voltage of the DSM includes motor back EMF, power supply ripple and high line.
CAUTION
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.
| Cable length up to 15 m | ||
From | Shielded |
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DC Supply | Ferrite | ||
| twisted | sleeve | |
+24 V | pair | ||
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0 V |
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500 μF | Connect shield to |
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per | earth ground at |
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Amp | supply end only |
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To
Pi type DSM RFI filter
Red
+flying lead
-Black
flying lead
Figure 6 - Power supply connections, cable length less than 15 m
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| Cable length up to 15 m |
| To | |
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From | Full wave | Pi type | Shielded | Ferrite | Pi type | DSM |
AC | bridge | RFI filter | twisted | sleeve | RFI filter | Red |
Supply | rectifier |
| pair |
| + | |
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| flying lead | |
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| - | Black |
Transformer: |
| 500 μF | Connect shield to |
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| flying lead |
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0 - 28 VAC RMS for | per | earth ground at |
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48 VDC systems. | Amp | supply end only |
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20 - 48 VAC RMS for
75 VDC systems
Figure 7 - Power supply connections, cable length more than 15 m
MN1940 |