P
M752 Microstepping Driver Manual V1.0
Tel: +44 (0)1202 237770 9
20
4000
OFF
OFF
ON
OFF
25
5000
ON
OFF
ON
OFF
40
8000
ON
ON
OFF
OFF
50
10000
OFF
ON
OFF
OFF
100
20000
ON
OFF
OFF
OFF
200
40000
OFF
OFF
OFF
OFF
Current Settings
For a given motor, higher driver current will make the motor to output more torque, but at the same
time causes more heating in the motor and driver. Therefore, output current is generally set to be such
that the motor will not overheat for long time operation. Since parallel and serial connections of
motor coils will significantly change resulting inductance and resistance, it is therefore important to
set driver output current depending on motor phase current, motor leads and connection methods.
Phase current rating supplied by motor manufacturer is important in selecting driver current, however
the selection also depends on leads and connections.
The first three bits (SW1, 2, 3) of the DIP switch are used to set the dynamic current. Select a setting
closest to your motor
’
s required current.
Dynamic current setting
Peak Current
RMS Current
SW1
SW2
SW3
1.26A
0.90A
ON
ON
ON
1.80A
1.29A
OFF
ON
ON
2.36A
1.68A
ON
OFF
ON
2.92A
2.09A
OFF
OFF
ON
3.51A
2.51A
ON
ON
OFF
4.09A
2.92A
OFF
ON
OFF
4.64A
3.32A
ON
OFF
OFF
5.20A
3.71A
OFF
OFF
OFF
Notes:
Due to motor inductance, the actual current in the coil may be smaller than the dynamic
current setting, particularly under high speed condition.
Standstill current setting
SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected
dynamic current, and ON meaning that standstill current is set to be the same as the selected dynamic
current.
PM752 Microstepping Driver Manual V1.0
Tel: +44 (0)1202 237770 10
The current automatically reduced to 60% of the selected dynamic current one second after the last
pulse. Theoretically, this will reduce motor heating to 36% (due to P=I
2
*R) of the original value. If
the application needs a different standstill current, please contact
Zapp Automation Ltd
.
8. Wiring Notes
l
In order to improve anti-interference performance of the driver, it is recommended to use
twisted pair shield cable.
l
To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor wires
should not be tied up together. It is better to separate them by at least 10 cm, otherwise the
disturbing signals generated by motor will easily disturb pulse direction signals, causing motor
position error, system instability and other failures.
l
If a power supply serves several drivers, separately connecting the drivers is recommended
instead of daisy-chaining.
l
It is prohibited to pull and plug connector P2 while the driver is powered ON, because there is
high current flowing through motor coils (even when motor is at standstill). Pulling or plugging
connector P2 with power on will cause extremely high back-EMF voltage surge, which may
damage the driver.
9. Typical Connection
A complete stepping system should include stepping motor, stepping driver, power supply and
controller (pulse generator). A typical connection is shown as figure 10.
Figure 10: Typical connection
