Lenze EVD4904-E DC DRIVE 4Q 23KW 50/90A 415VAC – 4900 Series DC Drive
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Product Information
The Lenze EVD4904-E is a 4-quadrant DC variable speed drive engineered for controlled acceleration, rapid deceleration, and regenerative energy recovery in demanding industrial applications. Belonging to the Lenze 4900 Series, this drive delivers a continuous rated power output of 23 kW while operating from a 3-phase 415 V AC mains supply. It supports a continuous armature current of 50 A with a peak current capacity of up to 90 A to accommodate high starting torques in converting lines, winders, hoists, and heavy material handling systems. An internal thyristor power bridge manages armature and field regulation to maintain motor stability across the entire speed curve.
System integration and drive commissioning rely on hardware-based controls rather than external software routines. The main control board features potentiometers and DIP switches for setting speed ranges, acceleration ramps, and operational limits directly on the drive. Terminal connections accommodate a +/-10 V analog speed command reference along with DC tachometer feedback for closed-loop speed control. Dedicated digital inputs handle enable, quickstop, and fault reset functions, while integrated relay contacts convey operational status to main automation controllers. When installing a replacement drive, technicians must replicate the potentiometer dial positions and DIP switch configurations, with ABC Industrial Parts available to support parameter verification and spare unit setup.
Visual status indication is provided directly on the main control circuit board via dedicated status LEDs covering power readiness, general trip conditions, I2T overload thresholds, and field failure states. Basic diagnostic checks involve verifying incoming 3-phase voltages, checking motor field winding resistance, and confirming tachometer connection polarity at the terminals. If an overcurrent fault triggers immediately upon power-up without a motor attached, the internal thyristor bridge has sustained internal hardware damage. In cases of internal hardware failure, ABC Industrial Parts provides tested exchange units and repair options to return equipment to active service quickly.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | EVD4904-E |
| Model / Type | DC DRIVE 4Q 23KW 50/90A 415VAC |
| Product Family | 4900 Series |
| Component Type | DC Variable Speed Drive |
| Rated Power Output | 23 kW |
| Mains Supply Voltage | 415 V AC |
| Continuous Armature Current | 50 A |
| Peak Armature Current | 90 A |
| Operating Quadrants | 4 Quadrants (4Q Regenerative) |
| Control Method | Armature and Field Regulated DC Control |
| Analog Speed Reference | 0 to +/-10 V |
| Speed Feedback | DC Tachometer Feedback |
Programming and Configuration
The Lenze EVD4904-E uses a fully hardware-based tuning and setup structure that operates without software applications or digital programming cables. Operational parameters including maximum speed, minimum speed, acceleration and deceleration rates, current limits, and controller response are calibrated using onboard potentiometers and DIP switch arrays on the main circuit board.
Commissioning a replacement drive requires physical replication of the settings from the existing unit. Aligning potentiometer dials and switch banks on the spare board ensures that performance parameters and feedback responsiveness match original machine specifications.
Communication and System Integration
Integration of the Lenze EVD4904-E into host machine control schemes is accomplished through physical terminal blocks. The drive accepts standard analog speed reference inputs from 0 to +/-10 V for flexible interface with programmable logic controllers and external potentiometers. Closed-loop speed control is achieved via dedicated screw terminal connections for a DC motor tachometer.
Digital terminal inputs provide hardware control over essential drive commands, including drive enable, quickstop, and fault reset operations. Relay contact outputs communicate drive trip status to supervisory equipment, while main board test points allow direct measurement of armature current and tachometer voltage feedback during operation.
Diagnostics and Status Indication
Diagnostic monitoring on the Lenze EVD4904-E is centered on visual LED indicators integrated on the main control board. These status displays provide clear indication of power readiness, general trip activation, thermal and current overload levels, and field circuit failures.
Hardware test points located on the board allow service personnel to verify armature current levels and tachometer feedback signal voltages directly with standard electrical testing equipment. Relay outputs simultaneously trigger fault input circuits on higher-level automation systems upon drive trip.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| READY / ON | Solid | Control supply active and drive ready for operation |
| TRIP / FAULT | Solid | Drive trip activated due to fault condition. Main thyristor firing pulses disabled. |
| I2T / OVERLOAD | Solid | Armature current limit or continuous overload threshold exceeded |
| FIELD FAIL | Solid | Field current failure or field circuit open. Hardware protection trips drive. |
Replacement and Spare Part Considerations
When selecting a spare controller for a Lenze EVD4904-E installation, it is necessary to verify full 4-quadrant (4Q) regenerative capability. Installing a non-regenerative controller in applications requiring rapid reversing or overhauling load management can lead to excessive line voltage stress, loss of deceleration control, or power bridge failure.
Prior to powering up a replacement unit, all potentiometer settings and DIP switch positions must be duplicated from the replaced unit. Careful attention must also be given to tachometer wiring polarity; reversing the positive and negative tachometer leads will cause feedback inconsistency, leading to motor speed runaway or immediate tachometer fault tripping.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| FIELD_LOSS | Field Current Failure | Field current dropped below minimal operating threshold or field winding circuit opened. | Open field winding on DC motor, blown internal field supply fuse, broken field cable connection. | Check motor field winding resistance, field supply wiring, and field protection fuses. |
| OVERCURRENT | Armature Overcurrent Trip | Peak armature current threshold exceeded. | Short circuit in motor armature, sudden severe mechanical lockup, defective thyristor bridge. | Inspect armature wiring and motor commutator. If error triggers immediately upon power-up without motor connected, internal power bridge is damaged and unit requires return for repair. |
| TACHO_FAULT | Tachometer Feedback Loss / Polarity Fault | Tachometer feedback signal lost, reversed in polarity, or inconsistent with armature voltage output. | Broken tachometer wiring, reversed tacho polarity (+/- swapped), mechanical failure of tacho coupling. | Verify tachometer mechanical coupling, check polarity and DC voltage level at tacho terminals during slow rotation. |
| OVERTEMP | Heatsink / Thermal Overload | Drive heat sink temperature exceeded maximum safe operating threshold. | Inadequate cabinet ventilation, blocked heatsink fins, cooling fan failure, excessive ambient temperature. | Clean heatsink, check fan operation, ensure proper enclosure airflow. |
| MAINS_FAULT | Mains Supply Phase Failure / Undervoltage | Input mains phase missing or line voltage below operational limit. | Blown main line fuse, dropped AC supply phase, incoming voltage sag. | Check line fuses, AC main contactor, and line voltage across all three incoming AC supply phases. |
Frequently Asked Questions
Is software or a programming cable required to configure the Lenze EVD4904-E drive?
No programming software or digital cables are needed. The Lenze EVD4904-E uses onboard potentiometers and DIP switches for all parameter settings, speed calibration, and tuning functions.
Can the Lenze EVD4904-E feed braking energy back into the power network?
Yes, as a 4-quadrant regenerative drive, the EVD4904-E returns energy to the 415 V AC mains supply during motor deceleration, reversing, and overhauling load conditions.
What speed feedback devices are supported by the EVD4904-E?
The drive includes screw terminal inputs specifically designed for DC tachometer speed feedback to ensure closed-loop speed regulation alongside a standard +/-10 V analog speed reference.
What does a FIELD FAIL status indicator indicate on the drive?
A FIELD FAIL trip indicates that the motor field current has dropped below operational limits or that the field circuit has opened. Recommended checks include field winding resistance, field cabling, and field fuses.
What indicates internal hardware bridge damage on an EVD4904-E drive?
If an overcurrent fault triggers immediately upon applying control power when no motor is connected to the armature terminals, the internal thyristor power bridge is damaged and requires repair or drive exchange.
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Specific firmware and hardware versions
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Disclaimer:
We are not an authorised distributor of Lenze.
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