wantai DQ542MA User manual

Manual of 2-phase hybrid stepper motor driver DQ542MA
Introduction:
DQ542MA is a type of two-phase hybrid stepping motor driver, the drive voltage of which is
from 18VDC to 50VDC. It is designed for use with 2-phase hybrid stepper motor of all kinds
with 42mm to 86mm outside diameter and less than 4.0A phase current. This circuit that it
adopts is similar to the circuit of servo control which enables the motor run smoothly almost
without noise and vibration. Holding torque when DQ542MA run under high speed is also
significantly higher than the other two-phase driver, what’s more, the positioning accuracy is
also higher. It is widely used in middle and big size numerical control devices such as curving
machine, CNC machine, Computer embroider machine, packing machines and so on.
Features:
High performance, low price
Average current control, 2-phase sinusoidal output current drive
Supply voltage from 18VDC to 50VDC
Opto-isolated signal I/O

Overvoltage, under voltage, overcurrect, phase short circuit protection
15 channels subdivision and automatic idle-current reduction
8 channels output phase current setting
Offline command input terminal
Motor torque is related to speed, but not related to step/revolution
High start speed
High holding torque under high speed
Electrical specification:
Input voltage
18-50VDC
Input current
＜4A
Output current
1.0A～4.2A
Consumption
Consumption：80W；Internal Insurance：6A
Temperature
Working Temperature -10～45℃；
Stocking temperature -40℃～70℃
Humidity
No condensation, no water droplets
gas
Prohibition of combustible gases and conductive
dust
weight
300GS
1. Pins assignments and description:
1) Connector Pins Configurations
Pin Function
Details
PUL +,PUL-
Pulse signal, PUL+ is the positive end of pulses input pin
PUL- is the negative end of pulse input pin
DIR+,DIR-
DIR signal: DIR+ is the positive end of direction input pin
DIR- is the negative end of direction input pin
ENBL+
Enable signal: ENBL+ is the positive end of direction input pin. This signal is used for
enabling/disabling the driver. High level for enabling the driver and low level for disabling the

driver.
ENBL-
ENBL- is the negative end of direction input pin. Usually left unconnected (enabled)
2) Pins wiring diagram:
PC’s control signals can be active in high and low electrical level. When the high electrical
level is active, all control negative signals will be connected together to GND. When low
electrical level is active, all control positive signals will be connected together to public port.
Now give two examples ( Open collector &PNP), please check them:
Fig 1. Input port circuit (Yang connection)
PC open connector output

Fig. 2 Input port circuit ( Yin connection)
PC PNP output
Note: When VCC=5V, R=0
When VCC=12V, R=1K, ＞1/8W
When VCC=24V, R=2K,＞1/8W
R must connect in the control signal part.
3. Function choice ( Using DIP pins to achieve this function)
1) Micro step resolution is set by SW 5,6,7,8 of the DIP switch as shown in the following table:
:
SW5
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SW6
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
SW7
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
SW8
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
PULS
E/RE
V
400
800
160
0
320
0
640
0
128
00
256
00
100
0
200
0
400
0
500
0
800
0
100
00
200
00
250
00
2) 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 is set to be the same as the
selected dynamic current.
3) Output current setting:
The first three bits (SW 1, 2, 3) of the DIP switch are used to set the dynamic current. Select a
setting
Closest to your motor’s required current
Output current (A)
SW1
SW2
SW3
PEAK
RMS
ON
ON
ON
1.00
0.71
OFF
ON
ON
1.46
1.04
ON
OFF
ON
1.91
1.36
OFF
OFF
ON
2.37
1.69
ON
ON
OFF
2.84
2.03
OFF
ON
OFF
3.31
2.36
ON
OFF
OFF
3.76
2.69
OFF
OFF
OFF
4.20
3.00
4) Semi-flow function:
Semi-flow function is that there is not step pulse after 500 ms, the driver output current
automatically reduced to 70% of rated output current, which is used to prevent motor heat.
4. Power connections
(1)+V、GND：Power Supply.
+V: Power supply, 16~50 VDC, Including voltage fluctuation and EMF voltage. The max
current is 5A.
(2) A+ A- B+ B-：Connecting 2 phase stepper motors.
The driver & 2-phase hybrid stepping motor use four-wire connection, the motor can be
connected in parallel & series bipolar. As for bipolar connection, it is higher performance with
high-speed, but the current of driver is larger (it is 1.73 times more than the motor’s winding
current).
Connecting in series, the driver’s current is equal to the motor winding one.
5. Fixing
There should be 20mm of space, it can’t be placed next to other heating devices, to avoid
dust, oil mist, corrosive gas, humidity and strong vibration places.
(Unit=mm)

Picture 3
6. Troubleshooting
1, the status on light’s indication
RUN: green, normal work light.
ERR: red, failure light, the motor with phase short-circuit, overvoltage and under-voltage
protection.
2 Troubles
Alarm indicator
Causes
Measures
LED off turn
Wrong connection for power
Check wiring of power
Low-voltages for power
Enlarge voltage of power
Motor doesn’t run, without
holding torque
Wrong connection of stepper
motor
Correct its wiring

RESET signal is effective
when offline
Make RESET ineffective
Motor doesn’t run, but
maintains holding torque
Without input pulse signal
Adjust PMW & signal level
Motor runs wrong direction
Wrong wires’ connection
Change connection for any of
2 wires
Wrong input direction signal
Change direction setting
Motor’s holding torque is
too small
Too small relative to current
setting
Correct rated current setting
Acceleration is too fast
Reduce the acceleration
Motor stalls
Rule out mechanical failure
Driver does not match with
the motor
Change a suitable driver
7. Driver Wiring
A complete stepper motor control system should contain stepper drives, DC power supply
and controller (pulse source). The following is a typical system wiring diagram.