EM-337A-48V-PLI is a parallel synchronization controller for four brushed DC motors or actuators operating from nominal 24–48 VDC supplies. It incorporates four full-bridge power stages and uses pulse feedback from each actuator to maintain synchronized speed and position.
The driver is controlled with forward and reverse commands. During movement, it continuously compares the feedback signals and adjusts the individual motor speeds to compensate for differences between the actuators. If the synchronization error exceeds the configured limit, all four motors are stopped to protect the mechanism.
Each actuator must provide a pulse feedback signal representing its movement. The EM-337A-48V-PLI monitors the four feedback channels and adjusts the motor outputs so that all actuators move at the same speed and remain at corresponding positions.
This active correction compensates for differences in actuator speed, mechanical friction and loading. It is particularly useful in systems where several actuators move a common structure in parallel.
A configurable difference limit determines the maximum permitted synchronization error. If the controller cannot correct the difference and the limit is exceeded, all motors are stopped. This helps prevent twisting, jamming and mechanical damage.
Forward and reverse commands control the movement direction. Adjustable acceleration and deceleration ramps provide smooth starts, stops and direction changes, reducing mechanical shock in the actuator system.
Load compensation improves synchronization when the individual actuators are subjected to unequal or changing loads.
The adjustable current limit protects the motors, actuators and mechanical structure against excessive current, torque and force. The current limit can be set between 1 A and 25 A.
The driver supports selectable 2 kHz and 16 kHz PWM frequencies. The 2 kHz setting provides the highest current capacity, while 16 kHz enables quieter operation with reduced current capability.
The control inputs can operate with either NPN or PNP logic. In NPN mode, an input is active at 0–1 V. In PNP mode, an input is active at 4–30 V.
The NPN open-collector fault output provides external fault indication. A 0–5 V analog position output is available for monitoring the system position.
The driver also provides a 5 V auxiliary supply for external control circuitry or feedback sensors, and an NPN brake output for controlling an external braking device.
The power stage is shut down if its temperature reaches 120 °C. Operation can resume only after the temperature has returned to a safe level and the applicable fault-reset conditions have been met.
The EM-337A-48V-PLI is available as a bare controller card or installed in a DIN-rail base. Fibox enclosure options are also available. The larger PC175/100 enclosure can be supplied with an integrated 300 VA power supply.
| Nominal supply voltage | 24–48 VDC |
| Supply voltage limits | 20–58 VDC |
| Undervoltage shutdown | 8 V |
| Overvoltage limit | 58 V |
| Idle current | < 20 mA |
| Continuous motor current at 2 kHz | 4 × 8 A |
| Continuous motor current at 16 kHz | 4 × 4 A |
| Motor current at 25% duty cycle, 2 kHz | 4 × 10 A |
| Motor current at 25% duty cycle, 16 kHz | 4 × 5 A |
| Motor current at 10% duty cycle, 2 kHz | 4 × 15 A, max. 5 s |
| Motor current at 10% duty cycle, 16 kHz | 4 × 8 A, max. 5 s |
| Maximum starting current | 4 × 25 A |
| Adjustable current limit | 1–25 A |
| PWM frequency | 2 kHz or 16 kHz |
| NPN input logic | ON = 0–1 V / OFF = 4–30 V or open |
| PNP input logic | ON = 4–30 V / OFF = 0–1 V or open |
| Control input impedance | typ. 47 kΩ or 10 kΩ |
| Maximum pulse-input frequency | 700 Hz per input channel |
| Pulse-input pull-up or pull-down resistance | 10 kΩ |
| Fault output | NPN open collector, max. 30 V / 50 mA |
| Auxiliary output | 5 V / max. 20 mA |
| Position output | 0–5 V, Rout 1 kΩ |
| Brake output | NPN, max. 4 A |
| Power-stage overtemperature shutdown | 120 °C |
| Supply connectors | Max. 4 mm² cable |
| Motor connectors | Max. 2.5 mm² cable |
| Control connectors | Max. 1.5 mm² cable |
| Operating temperature (Ta) | −40…+60 °C |
| Weight | 190 g |
| EMC | EN 55022B and EN 61000-6-2 / EN 61000-4-2…-6 |
| Card dimensions | 142 × 73 × 28 mm |
| Dimensions with DIN-rail base | 145 × 127 × 50 mm |
| Fibox PC150/60 enclosure | 180 × 130 × 60 mm |
| Fibox PC175/100 enclosure | 180 × 180 × 100 mm, includes 300 VA power supply |
Ordering larger quantities +100pcs.
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