EM882S Digital Stepper Drive User Manual
Motion Control Products Ltd. Tel.: (+44) 01202 599922
it is suggested to use lower supply voltage power supplies.
6.1 Regulated or Unregulated Power Supply
Both regulated and unregulated power supplies can be used to power an EM882S. Theoretically unregulated power
supplies are preferred due to their ability to withstand back EMF current surge and faster response for current change.
If you prefer to use a regulated power supply instead, it is suggested to choose one specially designed for stepper or
servo controls
.
In the case when only general purpose switching power supplies are available, choose one with
“OVERSIZED” current output rating (for example, using a
4A power supply for 3A stepper motor) to avoid current
clamp. On the other hand, if unregulated supply is used, one may use a power supply of lower current rating than
that of motor (typically 50% - 70% of motor phase current). The reason is that the drive only draws current from an
unregulated power supply during the ON duration of the PWM cycle, but not during the OFF duration.
6.2 Power Supply Sharing
Multiple EM882S drives can share the same power supply, if that power supply has enough capacity. To avoid cross
interference, connect each EM882S DIRECTLY to that shared power supply separately instead of connecting those
power connectors of drives in daisy-chain connection.
6.3 Selecting Supply Voltage
EM882S
’s operating voltage is
20-80 VDC. Because of voltage increasing from potential power line voltage fluctuation
and back EMF voltage generated during motor deceleration, it is suggested to use a 24-72 VDC power supply.
7. DIP Switch Configurations
The EM882S has one 8-bit DIP switch and one 16-bit rotation switch selector.
“
Default
”
means that parameters can be
modified by Leadshine ProTuner software.
The DIP switch S1 in Figure 2 and used to configure settings of micro step resolution, output current, and motor
standstill current as shown below, the factory setting of SW1-SW8 is
ON, ON, ON, OFF, ON, ON, ON, ON.
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
The rotation Switch S2 is located on the top (rotation switch selector 2 in figure 2) for motor selection.
7.1 Output Current Configuration (SW1-3)
The EM882S has 8 output current settings which can be configured through DIP switch SW1, SW2 and SW3.
For a given stepper motor, as normal setting the output current to 1.4 times of motor phase current, will make it
output larger torque, but at the same time cause more heating for both the motor and drive. Therefore, it is
suggested to set a output current (peak of sinusoidal) to no more than 1.2 times the stepper motor’s
(for 4-lead
motor) phase current to prevent overheating .
The SW1, SW2 and SW3 are u
sed to set the dynamic current. Select a setting closest to your motor’s required current.
When they are set to
ON, ON, ON,
the output current can be set by Leadshine ProTuner.
Idle Current
Output Current
Microstep
