Alarm codeAL rH
Resistor heat, braking (DB) resistor overheat means the braking resistor’s heating power exceeded a specified value, possibly due to high braking frequency or voltage issues. The manual's first action is: “use an external braking resistor,”
- Model
- Faldic MHT259a (RYS-L type)
- Display shows
- Resistor heat, braking (DB) resistor overheat (AL rH)
- Type
- Alarm code
- Source
- Manual p. 326
What AL rH means
Resistor heat, braking (DB) resistor overheat p. 330
Common causes
- Resistor heat, braking (DB) resistor overheat p. 330
- The heating power of the braking resistor of amplifier exceeded a specified value. p. 330
- If an alarm is detected immediately after turning on power, the power supply voltage may be higher than specified. If detected while running, the frequency of braking operation may be high, and the braking resistor may overheat. In such a case, p. 330
What to do
- use an external braking resistor, p. 330
- prolong the accel./decel. time, or p. 330
- raise the reduction speed ratio, if possible. p. 330
Before you service the product, read the safety instructions in the manual p. 3.
If AL rH is still not resolved
- contact service / dealer p. 3 “reference must be made to this manual and other related documents.”
- contact service / dealer p. 4 “Customers, who want to use the products introduced in this manual for special systems or devices such as for atomic-energy control, aerospace use, medical use, and traffic control, are requested to consult the Fuji.”
This page summarises what the manufacturer’s manual says about AL rH; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Faldic. Found a mistake? Report an error.