A
we are repairing with this old elevator for quite some time already, old controls were replaced with new ones... we have bought a schnieder 7.5 kw inverter to control the motor (5.5kw) speed going up and down...
problems encoutered were:
1) when the elevator cab is loaded, motor tends to loose its strength than when elevator cab is empty.
- we suspect that inverter needed a brake resistor as per previous experience however new problem arose...
2) inverter would display Ocr (Over current) after running the elevator sometime
- dc braking was used
3) everytime we have to power up the inverter a nSt (not set) will always be displayed... we have to remove L1 and then replace it again for the inverter to go to ready position... (we can't be doing this everytime)...
problems encoutered were:
1) when the elevator cab is loaded, motor tends to loose its strength than when elevator cab is empty.
- we suspect that inverter needed a brake resistor as per previous experience however new problem arose...
2) inverter would display Ocr (Over current) after running the elevator sometime
- dc braking was used
3) everytime we have to power up the inverter a nSt (not set) will always be displayed... we have to remove L1 and then replace it again for the inverter to go to ready position... (we can't be doing this everytime)...