Mik-el Door Card (Control Card) Technical Service
Mik-el door card and control card faults are among the fastest faults on-site that cause an elevator to go out of service. The elevator will not move unless the door is closed and locked; therefore, even the slightest instability on the card side interrupts the trip. Moreover, the door system operates with a very high cycle count during the day. This puts continuous strain on the sliding components, relays/outputs, connectors, and power supply circuit on the card. Consequently, faults sometimes appear as “suddenly stopped completely,” and other times as intermittent issues like “works sometimes, doesn’t work at other times.”
At Poyraz Endüstriyel, the most important focus in Mik-el service is this: repairing the card alone is not sufficient; the field conditions that caused the card’s failure must also be addressed. When dirt builds up on the door rails/guides and mechanical friction increases, motor current rises; the card may overload and reopen the door or enter protection mode. If the photocell/light barrier alignment is disturbed, the card senses an obstacle. If the lock contact is faulty, the control card cannot confirm the locking condition even if the door appears closed. Therefore, Mik-el door card/control card service should be conducted by considering both electronics and field signals together.
What is a Mik-el Door Card?
The Mik-el door card is an electronic board that controls the elevator door motor and manages the door’s safety inputs (photocell/light barrier, safety edge), limit switch information, and lock signal. It determines the door’s opening-closing speed, torque, and motion characteristics. If the door card malfunctions, the door may not close, may reopen while closing, or the elevator may disable the trip because the locking condition is not met.
The “control card” is a more comprehensive board that manages the overall elevator control. In some Mik-el applications, door control is integrated via the control card; thus, even if a fault complaint is opened as “door card,” the problem may originate from the control card’s input reading, power stability, or safety chain monitoring.
Main functions of the door card:
- Driving the door motor in open/close directions
- Adjusting speed-torque profile (smooth closing without shock)
- Managing door reopening upon obstacle detection
- Reading door open/close limits
- Producing and transmitting lock/door ready status to the system
How is the Mik-el Door Card Repaired?
Mik-el door card repair is performed by correctly classifying the fault. The most common error is removing the card and proceeding with the assumption “card is defective,” whereas the real triggers might be mechanical friction, power supply fluctuation, or sensor contact issues. In such cases, even if the card is repaired, the fault will return shortly.
Workshop repair approach:
- Fault description and logging: Does the door not move at all, reopen while closing, stop midway, or fail to lock? If available, photos of LED/error indicators are taken.
- Visual inspection: Burn marks, heat discoloration, swollen capacitors, cracked solder joints, overheated connectors.
- Power supply measurement: Is the card’s power supply stable? Weak/fluctuating supply causes resets and intermittent faults.
- Input/output verification: Are photocell, limit, and lock inputs read steadily? Do relays/outputs activate at the correct times?
- Motor drive circuit repair: If the driving components (MOSFET/IGBT/driver circuit) are faulty, the motor either will not turn or runs weakly.
- Function tests: Open-close cycles, obstacle simulation, and limit-lock logic are verified repeatedly.
For the repair to be considered “permanent,” the card must operate reliably under various scenarios; one single open-close test is often insufficient.
Mik-el Door Card Faults and Symptoms
Faults attributed to Mik-el door or control cards generally display the following symptoms:
Door does not open or close at all:
- Power supply to the card may be absent or unstable.
- Motor drive output may be faulty.
- Interruption may occur due to heating of connectors/terminals.
Door reopens while closing:
- Photocell/light barrier may continuously detect an obstacle (dirt, misalignment, cable contact issue).
- Mechanical friction of the door has increased; motor current rises, causing the card to reopen for safety.
- Unstable limit switches prevent full closure.
Door stops midway, operates intermittently:
- Power regulation issues causing resets.
- Thermal weakness in output components (performance drops when heated).
- Field contact failures (cables, sockets, limit switches).
Lock condition does not occur, elevator does not move:
- Lock contact may be faulty.
- Control card may not reliably read lock input.
- Even if the door appears closed, limit/lock sequence may be incorrect.
Door slams or feels uncomfortable:
- Speed-torque settings might be altered.
- Mechanical adjustments may be off (feels similar to a card fault).
To accurately interpret the symptom, the question “When does it happen?” is critical: during closing, opening, or locking? This information quickly narrows down the fault direction.
Why Choose Poyraz Endüstriyel for Mik-el Door Card Repair?
Door faults are the quickest to cause operational downtime and can lead to repeated same-day service calls. Therefore, the goal in door card service is not just to get the card working but to minimize recurrence of the fault. At Poyraz Endüstriyel, we act with this objective in Mik-el service.
Our approach that makes us a preferred choice:
- Card vs. field distinction: We differentiate photocell/limit/lock contact faults from card faults.
- Function test discipline: We never deliver without obstacle simulation and repeated limit-lock logic tests.
- Proper component standards: We reduce recurrence risks by selecting the correct class for power and motor driving components.
- Field inspection notes: We clearly provide recommendations on mechanical friction, rail-guide cleanliness, sensor alignment, and cable-terminal tightness.
This approach reduces the maintenance team’s time lost on site and prevents repeat visits for the same fault.
Supported Models
MD 2012
MD STO
MOMENTUM
MIKRONIK SX
MIKRONIK SM
MIKRONIK SHI
When sending these models for service, providing the label/revision information on the card, photos of connection sockets, and a record of the fault behavior (including any LED/error indicators) speeds up diagnosis. Different revisions of cards with the same name may have changes in input-output layouts and power supply topologies.
Common inspection points for this model family:
- Signs of overheating and solder cracks on motor drive outputs
- Power regulation stability (in reset and intermittent fault complaints)
- Stable reading of photocell/limit/lock inputs
- Wear and instability in relay/output contacts
- Connector/terminal heating and signs of loose connections
When Should the Mik-el Door Card be Repaired?
The card often gives warnings before becoming completely inactive. The following situations require service:
- Door does not open or does not close at all
- Door reopens while closing with no obstacle present in the field
- Door stalls midway or its behavior changes each time
- Even if the door seems closed, lock condition does not occur
- Card resets and indicator lights function erratically
- Burn smell, heat marks, or connector heating observed on the card
Early intervention prevents damage from worsening on the card and reduces downtime on-site.
Mik-el Door Card Repair Process
At Poyraz Endüstriyel, Mik-el door card/control card repairs follow these steps:
- Device acceptance: Model, revision, fault description, and any LED/error status provided.
- Preliminary analysis: Visual inspection, power supply check, assessment of connectors and terminals.
- Input/output tests: Verification of photocell, limit, lock inputs, and relay/output behavior.
- Repair: Power supply circuit, motor drive elements, driver circuit, PCB, and connector repairs.
- Function testing: Open-close cycles, obstacle simulation, limit-lock sequencing, and repeated testing.
- Field inspection notes: Rail-guide condition, mechanical friction, sensor alignment, and cable-terminal tightness.
The process is planned to ensure the card operates stably on-site.
How to Detect Mik-el Door Card Faults?
Accurate diagnosis during door faults is accelerated by correct observation. The following points provide practical distinctions:
- If the door doesn’t move but the motor is struggling, mechanical jamming is likely.
- If the door reopens while closing, the photocell/light barrier or safety edge input might be triggered.
- If the door closes but the elevator doesn’t move, the lock contact or lock signal side is suspect.
- If there is an LED/error indicator on the card, take a photo before resetting.
- If faults increase with heat, power supply stability or thermal issues in output components may exist.
With this information, the question “Card or field?” can be quickly narrowed down.
Why is the Mik-el Door Card Important?
The Mik-el door card/control card plays a direct role in the elevator’s safety chain. The elevator must not move before the door is locked; this condition is ensured by the door card, locking mechanism, and control card working together. A fault on the card side can completely disable the elevator.
It is also critical for comfort: proper acceleration and deceleration of the door, safe reopening upon obstacle detection, and avoidance of harsh impacts enhance passenger experience and extend the mechanical components’ lifespan.
Important Precautions When a Mik-el Door Card Malfunctions
Forcing the door or ignoring faults can cause greater damage to both the card and mechanical parts.
Precautions to take:
- If the door is hard to operate, do not repeatedly test before resolving mechanical friction.
- If LED/error indicators are present, take photos before attempting a reset.
- Check cleanliness and alignment of photocell/light barrier.
- Inspect cable-terminal looseness and connector overheating.
- Review rail-guide cleanliness and door adjustments.
- If supply fluctuations are suspected, check the power source.
These steps speed up diagnosis and prevent further damage.
Mik-el Door Card Repair Prices
Mik-el door card/control card repair prices vary depending on the fault scope on the card, damage level, and testing requirements. The complaint “door reopens” is not always a card fault; it can be caused by photocell, limit switch, or mechanical friction issues. In such cases, field corrections provide a more cost-effective solution than card repair. For faults in motor drive components or power regulation problems, component-level repairs on the card are necessary.
Factors affecting price:
- Whether the fault is on the power supply/regulation side or the motor drive output side
- Presence of burn or carbonization damage on the PCB
- Impact of relay/connector/terminal heating on the card
- Scope of function testing (obstacle scenario, limit-lock verification)
- Necessary inspections and guidance to reduce recurrence risks due to field conditions
For an accurate preliminary assessment, the card label/revision info, a short video of fault behavior, and photos of any LED/error indicators are sufficient. With this information, we can classify the fault and provide a more realistic price and timeline estimate.