İastar Elevator Drive Technical Service
İastar elevator drive technical service primarily involves AS320 series drive fault diagnosis, power board (rectifier–DC bus–IGBT/braking) and control/power supply board (SMPS, control board, gate driver, current/voltage measurement circuits, IO/communication) repair, cooling and connection checks, necessary component replacements, and most critically, under-motor testingto confidently return the drive to the field. In elevator applications, merely powering on the drive, entering “Ready/Run” status, or running the motor unloaded is not sufficient. Many faults emerge under load conditions, during heavy traffic heating, in slow-down/braking cycles, or voltage fluctuations. Therefore, at Poyraz Endüstriyel, the approach is not “it runs” but verifying the drive’s stable operation under field-like conditions.
Common complaints with İastar drives in the field include: juddering or shaking during start-up, speed fluctuations at low speed, jerkiness when approaching floors, leveling errors on stops, DC bus over-voltage during slow-down, faults under heavy traffic, intermittent resets/display shutdowns, IO/communication drops, and circuit breaker trips on power-up. However, these symptoms do not always indicate internal drive faults. Poor grounding, phase imbalance/voltage drop, motor cable insulation leaks, shielding or topology faults, braking resistor/circuit issues, contactor/brake coil noise, high panel temperature, and loose terminal connections can also trigger protective actions and cause similar symptoms. Reliable technical service distinguishes correctly between “drive fault” and “drive triggered by external conditions.”
Information that speeds up the process includes: the exact device model label (AS320), observed error codes/display messages, the operational phase when the fault occurs (start-up–running–slow-down), cabin load status, whether the fault worsens with heating, panel internal temperature, and any recent parameter or wiring changes. “Runs unloaded but trips under load” increases the likelihood of power board degradation, DC bus capacitor aging, or thermal issues. “Fault during slow-down” suggests braking and DC bus discharge problems. “Circuit breaker trips on power-up” points to possible short circuit on the power board and should be handled without repetitive power cycling.
What is an İastar Elevator Drive?
The İastar elevator drive is a VVVF/VFD inverter drive that controls the speed and torque of an elevator motor. It converts the incoming AC power from the grid to a DC bus via rectification; then through an IGBT switching board produces the desired frequency and voltage for the motor. This enables smooth start-ups, stable travel, precise floor approach, and comfortable stops in the elevator. A properly functioning drive not only enhances comfort but significantly impacts the mechanical system’s lifespan and operational continuity.
The drive operates in conjunction with the control panel, safety chain, contactors, and brake management. Field conditions such as motor-cable infrastructure, grounding/shielding arrangement, and panel temperature are also critical for reliable drive operation. Therefore, many errors seen on the drive can actually stem from external issues forcing the drive into protection. For instance, if the brake resistor circuit is weak, the DC bus voltage rises during slow-down causing the drive to enter “over-voltage” protection. Grid imbalance or poor grounding may increase intermittent resets and communication faults.
The internal structure of İastar drives is practically divided into two main parts: the power board (rectification, pre-charge, DC bus capacitors, IGBT output, braking) and the control and power supply board (SMPS, control board, gate driver, current/voltage measurements, IO/communication). Fault symptoms and error codes often provide valuable clues about which section is weakened.
How is an İastar Elevator Drive Repaired?
Repair of the İastar (AS320) drive begins with accurate information from the field, continues with layered diagnosis and repair in the workshop, and concludes with a test under the motor. Simply powering on the drive or running the motor unloaded does not capture faults that occur under load or during the braking cycle. Therefore, repair durability is always verified with testing under realistic motor conditions.
Initially, fault codes/display messages and fault occurrence conditions are clarified: does it happen at start-up, during travel, or slow-down? Does the symptom change as load increases? Does the fault become more frequent with heating? Then a visual inspection is carried out: checking for burn marks, swollen/leaking capacitors, darkened resistors/traces, fan status, dust blockages, cooler-thermal contact issues, and terminal/connector heating.
On the power board, the rectifier, IGBT, pre-charge circuit, DC bus capacitors, and braking circuit are measured. An ESR increase in DC bus capacitors may destabilize the DC bus and trigger protection faults. Braking circuit weakness is especially visible as “DC bus high/over-voltage” during slow-down. On the control and power supply side, SMPS outputs are evaluated for ripple and thermal stability; a weak power supply can cause intermittent resets, display shutdowns, or communication drops. Intermittent faults also necessitate checking for cold solder joints and socket contact issues.
During the motor-under test after repair, current draw, DC bus stability, braking response, heating behavior, IO/communication stability, and fault recurrence are monitored. The delivery criterion is not just “runs,” but stable operation without repetition under field-like conditions.
İastar Elevator Drive Faults and Symptoms
Faults in İastar drives can be classified into three main groups: power board, power supply-control board, and field triggers. Typical symptoms encountered in the field include:
Breaker trips/fuse blows on power-up: High probability of short circuit on the power board (IGBT, rectifier, DC bus). Repeated power cycling may cause further damage.
Drive powers on but motor does not run: Possible issues with brake management, contactors, drive output board, gate driver, motor/cable, or command-parameter settings.
Juddering at start-up / speed fluctuation at low speed: May be caused by current measurement errors, unstable control loops, parameter corruption, power supply ripple, or motor-side problems.
Jerkiness when approaching floors / leveling errors on stops: Related to slow-down profile, torque management, and brake synchronization; reduces comfort and increases mechanical wear.
Over-voltage during slow-down (DC bus high / over-voltage): Connected to braking circuit, brake resistor wiring/value, DC bus capacitors, and grid voltage.
Faults in heavy traffic: Increases likelihood of thermal issues such as fan failure, air duct clogging, panel heat, cooling inefficiency, or thermal leakage in power board.
Intermittent reset/display shutdown/communication drop: May be caused by SMPS instability, cold solder joints, connector contact failures, or electromagnetic interference (grounding/shielding).
Why Choose Poyraz Endüstriyel for İastar Elevator Drive Repairs?
Permanent results in repairing İastar (AS320) drives are measured by the drive’s ability to remain stable under the same load, braking cycle, and similar temperature conditions in the field. The primary reason to choose Poyraz Endüstriyel is that we complete repairs not just at the “fault gone” level but with a root cause analysis combined with under-motor verification approach.
In power board faults, replacing only the faulty part is not enough. Gate driver circuits, measurement feedback loops, DC bus capacitors, pre-charge circuits, and cooling performance are all inspected together. In power supply faults, simply seeing an output from the SMPS is insufficient; ripple and thermal stability must be checked. Cold solder joints and socket contact issues are thoroughly examined in intermittent resets/communication faults, as vibration and thermal cycling worsen these failures.
Additionally, practical guidance is provided for field conditions triggering the drive (grounding, grid quality, shielding, brake resistor, panel temperature, loose connections). Our delivery criteria are not just “menu access” but stable and reliable operation under the motor.
Supported Models
At Poyraz Endüstriyel, the supported model for İastar drive technical service is:
- AS320: Priority is given to start-up and slow-down comfort, brake synchronization, DC bus stability, and long-term load testing in elevator applications. Drives entering protection during slow-down have detailed inspections of braking circuits and DC bus capacitor health. For intermittent reset/communication issues, SMPS ripple analysis and contact/cold solder checks are focused on.
Note: Providing the exact model label, power rating (kW), and panel conditions (temperature, ventilation) speeds up the diagnostic planning.
When Does an İastar Elevator Drive Require Repair?
Situations indicating that an İastar drive requires repair include recurring faults/protections, comfort degradation, and power-up issues. If the drive frequently faults, interrupts service, locks up, resets, or trips out under heavy traffic, technical service is necessary. Even if the elevator operates, symptoms like start-up judder, floor approach jerkiness, or leveling errors on stops may indicate the drive is operating at its limits.
“Runs well unloaded but trips under load” indicates power board weakness, DC bus capacitor aging, or potential thermal issues. “Fault during slow-down” points to problems in braking or DC bus discharge. “Circuit breaker trips on power-up” strongly suggests a short circuit in the power board and should not be delayed.
Intermittent resets and communication drops are also critical; such faults usually worsen over time. Early intervention increases repair success and reduces costs.
İastar Elevator Repair Process
The İastar drive repair process includes collecting information from the field, diagnosis and repair in the workshop, verification under the motor, and providing necessary field recommendations. If the verification step is skipped, the drive may fault again under similar field conditions.
Initially, model (AS320), error code/message, fault occurrence stage (start-up–run–slow-down), load status, panel temperature, and recent interventions are gathered. If a fault occurs during slow-down, the braking/DC bus circuit is monitored more closely; if during start-up, the output board and current measurements are scrutinized.
In the workshop, after visual inspection, measurements are performed on the power board (IGBT, rectifier, pre-charge, DC bus capacitors, braking circuit) and the control–power supply board (SMPS, gate driver, measurement, and communication circuits). Cold solder joints and connector contact issues receive extra attention in cases of intermittent faults. The final step is the motor-under test to monitor current, heating, DC bus stability, braking response, IO/communication stability, and fault recurrence; long-term cycle tests may be performed if necessary.
How to Detect an İastar Elevator Drive Fault?
The most practical way to detect an İastar drive fault is to evaluate the error code/alarm information, the fault occurrence conditions, and the cabin behavior together. Note any error codes and take photos of the display if possible. Does the fault occur at start-up, during travel, or slow-down? Does it increase with load? Does it become more frequent with heating? These questions are crucial for accurate diagnosis.
Cabin behaviors like juddering, fluctuations, jerkiness, or leveling errors may indicate drive control instability. However, motor condition, brake settings, mechanical friction, grid quality, and grounding/shielding problems can cause similar results. Therefore, basic field checks should be conducted before making parameter changes when a fault exists.
If severe symptoms such as breaker trips/fuse blows on power-up occur, avoid repeatedly powering the drive. If there is a burnt smell or abnormal heating, power must be cut off and diagnosis performed methodically. Recording fault conditions during intermittent faults accelerates repair.
Why is the İastar Elevator Drive Important?
The İastar drive is a key component that determines elevator ride quality (comfort) and operational continuity. Since it controls motor speed and torque, it affects smooth start-up, stable travel, jerk-free slow-down, and precise stops. Drive instability reduces user satisfaction, places extra stress on mechanical systems, and increases maintenance costs.
Comfort-related complaints such as shaking, jerking, and harsh stopping mostly relate to drive control. Leveling errors on stops are critical for boarding safety. From a mechanical durability perspective, the drive reduces wear on ropes, pulleys, bearings, and braking components by minimizing harsh starts and sudden stops. Proper brake synchronization ensures healthier brake mechanism operation.
In terms of continuity, drive faults can stop elevator operation entirely. Repeated failures increase operational losses and complaints. Therefore, drive stability directly affects total costs.
Precautions When an İastar Elevator Drive Fails
When an İastar drive fails, safety and preventing further damage are priorities. If breaker trips/fuse blows occur on power-up, repeatedly powering on the drive is not advisable; a short circuit in the power board is likely. If burnt smell, smoke, or abnormal heating are present, power should be cut immediately and the device must not be operated uncontrolled.
Quick panel checks include: ensuring fans are working, air ducts are not clogged, the drive is not overheating, cable lugs are tight, terminals are secure, no burn or heat marks on connections, and brake resistor connections are intact. Loose connections can heat under load causing voltage drops and triggering protection.
External triggers must also be assessed: poor grounding, phase imbalance, grid fluctuations, motor cable insulation leaks, inadequate shielding, brake resistor/circuit problems, contactor/brake coil interference, and high panel temperature. If these factors are not corrected, fault risk remains high even after repair.
Recording the error code and fault conditions (start-up/slow-down, load, temperature) speeds diagnosis. Random parameter changes during faults typically worsen the problem; controlled diagnosis is recommended.
İastar Elevator Drive Repair Prices
İastar (AS320) drive repair prices vary depending on the fault layer (power supply, power board, control board), damage extent, fault intermittency, and the duration of motor-under test/monitoring. Therefore, providing a fixed price without examining the device is not reliable. At Poyraz Endüstriyel, we first classify the fault and then provide a transparent cost estimate.
Main factors affecting price:
- Power supply (SMPS) and control faults: usually resolved at lower cost, but ripple and thermal stability verification is essential.
- Power board faults (IGBT, rectifier, DC bus capacitors): typically higher cost due to parts and labor.
- Chain damage: cost increases if faults spread to other circuits.
- Intermittent faults: test duration extends to identify the problem and ensure no recurrence in the field.
- Field triggers: unresolved causes like brake resistor, grounding, grid quality can cause repeated faults affecting total cost.
For clearer pricing, the following information is usually sufficient: model (AS320), fault code, fault occurrence timing (start-up/slow-down), whether it increases under load, panel internal temperature, and any previous interventions on the device. With this information, we quickly classify the fault and provide a more accurate repair quote.