DRV10983: PROBLEMS IN OPEN LOOP AND CLOSE LOOP

Part Number:DRV10983

I am using DRV10983 for driving ceiling fan. Initially, i am rotating in open loop and i have disabled my close loop. The system starts with proper alignment time and with open to close loop threshold frequency it rotates for 5-10 seconds and then stops. I have measured Rm and Kt values using tunning guide as recommended by TI.

SYSTEM parameters:

Voltage: 24V

Current : 1.66A

Max Speed: 370rpm

Rm: 1.54 ohms

Kt: 692mV/Hz

initial speed:65% duty cycle

EEPROM data:

Address          Value

0x20         =         0xCA
0x21         =         0xEC
0x22         =         0xCC
0x23         =         0x03
0x24         =         0xC0
0x25         =         0x7F
0x26         =         0x52
0x27         =         0x14
0x28         =         0xEC
0x29         =         0x39
0x2A         =         0x03
0x2B         =         0x0F

The above problem is with open loop. I have also tired to rotate in close loop. For close loop, speed above 70% duty cycle the system was working properly but for speed below 70% duty cycle (60% or 50% ) the system would run for 5 seconds and then stop indicating over current limit threshold. If i disable the over current limit threshold then to the fault will be same.

EEPROM data for close loop mode:

Address          Value

0x20         =         0xCA
0x21         =         0xEC
0x22         =         0xCC
0x23         =         0x03
0x24         =         0xC0
0x25         =         0x7F
0x26         =         0x52
0x27         =         0x14
0x28         =         0xEC
0x29         =         0x39
0x2A         =         0x03
0x2B         =         0x0E