1. Stuck or unable to raise or lower
This is the most common malfunction, directly impacting deployment efficiency.
Causes: Lack of lubrication or the presence of sand or water on the sliding surfaces between sections, increasing friction.
Wear and deformation of the guide wheels/slider, causing eccentric stress on the mast.
Misalignment, knots, or blockage of the hydraulic lines (pneumatic/hydraulic models).
High-risk scenarios: Long-term lack of maintenance, or failure to clean after use in dusty/humid environments.
2. Light panel slides down after power failure (self-locking failure)
This poses a serious safety hazard, potentially causing the equipment to fall and injure people.
Causes:
Aging or insufficient voltage in the electromagnetic brake, preventing effective engagement.
Deformation of the mechanical lock stop pin or spring failure, preventing it from locking.
False triggering of the electronic limit switch in the dual limit system, causing the mechanical limit switch to fail to engage.
Risk warning: This type of malfunction is more common in low-end models or equipment exceeding its service life.
3. Motor overheating or weak drive
Manifests as slow raising or lowering, mid-operation stoppage, or difficulty starting.
Cause Analysis:
Overload operation or frequent start-stop cycles leading to motor overload.
Poor heat dissipation design, continuous operation in high-temperature environments triggering thermal protection.
Unstable power supply voltage (e.g., voltage drop in vehicle-mounted power supply) or aging wiring increasing resistance.
Typical Symptoms: Burning smell or hot casing during operation.
4. Severe pole swaying or excessive top displacement.
Affects lighting stability, especially dangerous in high wind speed environments.
Cause Analysis:
Excessive inter-section gap (>1mm), reducing structural rigidity.
Unstable bottom support (outriggers not deployed or soft ground).
5. Lack of reinforcement under high wind pressure, causing resonance.
Consequences: Long-term swaying accelerates weld fatigue and may even cause fracture.
Sealing failure and internal water ingress.
Causes short circuit in the control system and corrosion of the transmission mechanism.
Cause Analysis: The sealing ring is aged, hardened, or improperly installed. Damaged surface coating was not repaired promptly, allowing moisture to seep in through gaps. High-pressure water was used directly on the joints during cleaning.
Subsequent Impacts: A chain reaction of malfunctions including condensation inside the control box, circuit board corrosion, and motor burnout.