This alarm is actually quite grounded, and many of the causes are uncomplicated and regular.
1. The fan dies on its own (the most common scenario)
This is the most straightforward one. The fan has been used for several years, the bearings are worn out, the speed slows down, or simply stuck and can not turn. Sometimes you can hear the "buzzing” with friction or a sound, this situation is basically no need to bother, direct replacement of the fan on the end of the matter.
2. Electricity, but the fan just does not rotate
This situation is not uncommon. May be a loose wire, may be the plug oxidized contact is not good, may also be the power board that way the output has a problem. Simply put, the fan body is not bad, but it did not eat on the power.
3. Dust is too thick, the air duct is blocked
This is particularly typical in the old workshop. You open the cabinet to see, the fan on a thick layer of gray, the filter has been blocked tightly, the entire air duct is basically ruined. At this time the fan turns up especially difficult, or even simply can not turn. Dealing with it is actually particularly simple - ash, the effect is much more useful than you think.
4. The fan is actually turning, but the system thinks it is "abnormal”
This situation is a little roundabout. The fan is obviously rotating, but the signal fed back to the system is not correct. There may be a problem with the detection circuit, or the control board may receive an abnormal signal. This kind of problem can not be solved by just changing the fan.
5. The environment is too hot, the fan for a long time "overworked”.
This is more like an aggravating factor, not the root cause. For example, the workshop temperature is already high, the ventilation of the cabinet is not good, several units of equipment crowded together. The fan has been running under high load for a long time, and it is aging particularly fast.
When it comes to the 701 alarm, don't rush to replace the parts, run through it according to this path
We generally do this in the field, especially practical:
First, open the cabinet door, directly look at the fan to turn or not. Power on state, if the fan does not move, it is basically the problem. If it turns very slowly or stuck, it is also recommended to change it directly.
Then close to listen to the sound. Are there any strange noises? That kind of "rustle” friction sound or "click” sound, eighty percent is the bearing is not working.
Then clean the dust by hand. Take an air gun and blow on the fan and filter, and often it will return to normal after the dust is removed. This step takes less than two minutes, but saves a lot of downtime.
If the dust is still not moving, then take a multimeter to measure the voltage. Voltage but the fan does not move, that is, the fan is bad; no voltage, then you have to follow the line back to check the power supply or board.
Finally, if you are in a position to do so, you can directly replace the
fan with the same specification and try it out. This is the fastest and most direct method of verification, than you analyze half a day there are useful. Field work is all about efficiency.
Don't confuse 701 with other overheating alarms!
This is where many people get confused:
- 700: the control unit is really overheating, the temperature is high.
- 701: is a fan problem, heat dissipation conditions are not guaranteed.
- Servo overheating: that is the motor itself is high temperature.
So the focus of the 701 is always on the cooling system, not the temperature value itself. You keep that in mind, and the direction of troubleshooting won't go astray.
How do I get this alarm to stop bothering you in the future?
This is actually quite a good thing to do, is that many factories usually easy to ignore.
A few simple but life-saving habits:
- Control cabinet ash regularly clean, do not wait for the blockage and then get.
- Fan with three to five years, take the initiative to replace the new, do not have to wait for it to break down and then shut down.
- Ensure that the ventilation around the cabinet, do not let things block the heat outlet.
- Don't let anything block the cooling vents. Don't put cables on the air ducts.
- If the temperature in the workshop is too high, find a way to cool down the cabinet.
Seriously, these are small things, but they can prevent a lot of inexplicable downtime.
