Rolling shutters provide a certain level of security for a location, helping to prevent property loss. They are widely used, such as for vehicle entrances at industrial plants and in residential garages, often in the form of electric rolling shutters. So, do you know how to repair a rolling shutter when it breaks? Regarding rolling shutter maintenance, the editors at Bidding Network will provide a detailed analysis below.
I. Common Rolling Shutter Faults in Maintenance:
1. Slow rotation or failure to rotate
The main causes include motor burnout, short circuits in the wiring, excessive motor load, or the stop button not springing back into position.
The solution for this type of fault is to replace the damaged motor, inspect and restore the wiring, adjust the limit switch slider to engage the switch contacts, properly reposition the switch, and check for any mechanical obstructions, which should be cleared if present.
2. Control failure
This occurs when the contactor's contacts are stuck, the micro-switch fails, the slider screw loosens, the mounting plate shifts (preventing the slider or nut from moving with the screw rotation), the limit switch's transmission gear is damaged, or the up/down buttons are jammed.
For this type of rolling shutter fault, the solutions include replacing the contactor, replacing the micro-switch or contact plate, tightening the screws to reposition the mounting plate, replacing the buttons, or replacing the limit switch's transmission gear.
3. Manual chain not moving
This fault is caused by a jammed chain tensioner, the chain blocking the cross slot, or the pawl failing to disengage from the ratchet wheel.
Now that we understand the causes of this rolling shutter fault, let's look at the solutions: replace the lubricant, straighten the chain, and adjust the relative positions of the pawl and tensioner.
4. Motor vibration or excessive noise
Fault causes: unbalanced or cracked brake disc; loose brake disc; lack of lubrication or bearing failure; improper gear meshing, lack of lubrication, or severe wear; motor humming or vibration.
Treatment methods: replace the brake disc or rebalance it; tighten the brake disc nut; replace the bearings; repair or replace the motor shaft output gear, lubricate or replace it; inspect the motor and replace it if damaged.
II. Rolling Shutter Maintenance Methods:
1. Visual Inspection
Thoroughly check the circuit board for any damage. For example: Are the pins loose? Are the connections incorrect? Are any components faulty? Based on the symptoms reported by the user, maintenance personnel can quickly analyze the fault and conduct inspections.
2. Listening
Most rolling shutter control systems use electromagnetic relays as controllers. The relay contact switches produce a distinct "clicking" sound. If no sound is heard and the relay-driven motor is confirmed to be functional, the relay is likely faulty.
3. Touch
During maintenance, it is common to touch certain components after power is applied, such as integrated circuits (ICs), voltage regulators, transformers, and driver diodes, to check if their temperature is normal. If a component heats up rapidly and becomes excessively hot without a short circuit, it can be identified as faulty.