The BMD‑20DIN ver.2 is a DC brush motor speed controller, designed for speed regulation of DC brush motors with a supply voltage of up to 24V and a power of up to 500W. It provides different methods of motor speed regulation, using potentiometers, analog or PWM signal. The acceleration and deceleration time are also adjustable and there is a current limitation function to prevent motor overloading.
Speed can be adjusted by one of the following:
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Internal potentiometer
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External potentiometer
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Analog signal 4…20 mA
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Analog signal -10…+10 VDC
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Analog signal 0…5 VDC
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PWM regulation
Acceleration, direction and deceleration are set by internal regulators included in the design of the device.
Other functions:
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Start and stop by a button on the front panel or by an external signal
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Motor overload protection with adjustable rated current
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Set the ratio of acceleration and deceleration
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Motor short circuit protection
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Emergency “HARD STOP” in the event of a break in the electrical circuit of the protection circuit, function of safe stop “Safe Stop 1”
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Temperature protection of power stages
Parameters of external direction and start/stop signals:
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Input type: clean contact
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Maximum resistance of the closed contacts: 4.7 kOhm
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Maximum input current: 0.5 mA
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“START/STOP” and “DIR” inputs logic can be easily adjusted by a customer: the inputs can operate both as per signal level and as per a front of the signal
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The default setting is operation as per a front of the signal for “START/STOP” input and as per a level of the signal for “DIR” input
Technical Data
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Operating voltage |
12 – 24 VDC |
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Continuous output current, adjustable |
0.2 – 20 A |
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Peak output current |
30 A |
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Analog speed control |
0…5 V, -10…10 V, 5…20 mA, PWM |
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Speed control range |
1 : 100 |
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Max. resistance of closed contacts |
4.7 kOhm |
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Max. current consumption of the controller |
0.5 mA |
DIMENSIONS
CONNECTIONS
OPERATING MODES
Speed control with built-in “SPEED” potentiometer
Additional connections are not required for the speed control if the built-in “SPEED” potentiometer is used. The extreme clockwise position of the potentiometer corresponds to the maximum rotation speed of the DC brush motor. The extreme counterclockwise position of the regulator corresponds to the minimum speed of the motor.
Speed control with external potentiometer
In the case of using an external potentiometer for DC brush motor speed regulation, the maximum speed corresponds to the extreme position of the regulator when 5 VDC is applied to the SPEED input. The minimum rotation speed corresponds to the position of the potentiometer when 0 VDC is applied to the SPEED input. Recommended resistance range of the external potentiometer is 2.2 … 4.7 kOhm.
Speed control with analog voltage signal 0…5 VDC
When using an external analog voltage signal 0…5 VDC for DC brush motor control, the rotation speed is proportional to the voltage level at the “SPEED” input. The maximum motor speed corresponds to a signal voltage of 5 VDC, the minimum speed corresponds to a signal voltage of 0 VDC.
Speed and direction control with analog voltage signal -10…+10 VDC
When speed is controlled by an analog signal of -10…+10VDC, the minimum speed (motor stop) corresponds to a signal level of 0 VDC, the maximum speed in the forward direction corresponds to a signal level of +10 VDC. The maximum speed in the reverse direction corresponds to a signal level of -10 VDC. This type of DC brush motor speed control is standard for most industrial control systems.
Speed control with analog signal 4…20 mA
When DC brush motor speed is controlled by a current analog signal of 4…20 mA, the maximum speed corresponds to a signal of 20 mA, the minimum rotation speed corresponds to a signal of 4 mA. Speed control using an analog current signal has several advantages that are fundamentally important for industrial systems: high noise immunity, signal transmission accuracy, and independence of the signal quality from the line length.
Speed control with duty ratio of an external PWM signal
The DC brush motor rotation speed can be regulated by an external PWM signal with a frequency of 50 Hz. The minimum speed (motor stop) corresponds to a pulse duration of 1540 µs. The maximum forward rotation speed corresponds to a pulse duration of 544 µs. The maximum rotation speed in the reverse direction corresponds to a pulse duration of 2400 µs.
