6
WM850 High Performance Microstepping Driver
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Note that due to motor inductance the actual current in the coil may be smaller than the dynamic current settings,
particularly at higher speeds.
DIP setting for current during standstill:
SW4 is used for this purpose, the half current setting will reduce motor heating at standstill. OFF meaning that the
standstill current is set to be half of the dynamic current and ON meaning that standstill current is set to be the same as
dynamic current.
7.
Control Signal Connector (P1) Interface
This driver uses differential inputs to increase noise immunity and interface flexibility. Single-ended control signals
from the indexer/controller can also be accepted by this interface. The input circuit has built-in high-speed opto -
coupler, and can accept signals in the format of line driver, open-collector, or PNP output. Line driver (differential)
signals are suggested for reliability. In the following figures, connections to open-collector and PNP signals are
illustrated and VCC = 5VDC. For other VCC voltages limit the current to 18mA maximum.
Examples: R=560ohms if VCC=12VDC
R=1.5Kohms if VCC=24VDC
Open-collector signal ()
Figure 2
* For the European Market – the maximum input voltage must be limited to 70VDC to comply with CE regulations.
