If The Motor Does Not Put Out Torque Or If Acceleration Is Slow - Omron SYSDRIVE 3G3FV User Manual

Maintenance Operations
The motor stops during acceleration or when a load is connected.
The load may be too big. The 3G3FV has a stall prevention function and an automatic torque boost
function, but the motor responsiveness limit may be exceeded if acceleration is too rapid or if the load
is too big. Lengthen the acceleration time or reduce the load. Also consider increasing the motor ca-
pacity.
The motor only rotates in one direction.
"Reverse run prohibited" is selected. If b1-04 (prohibition of reverse operation) is set to "1" (reverse run
prohibited), the Inverter will not receive reverse run commands. To use both forward and reverse op-
eration, set b1-04 to "0."
H If the Direction of the Motor's Rotation is Reversed
The motor's output wiring is faulty. When the Inverter's T1(U), T2(V), and T3(W) are properly con-
nected to the motor's T1(U), T2(V), and T3(W), the motor operates in a forward direction when a for-
ward command is executed. The forward direction depends on the maker and the motor type, so be
sure to check the specifications. Switching two wires among the T1(U), T2(V), and T3(W) will reverse
the direction of rotation.
H If the Motor Does Not Put Out Torque or If Acceleration is Slow
The torque limit has been reached.
When a torque limit has been set in parameters L7-01 to L7-04, no torque will be output beyond that
limit. This can cause the torque to be insufficient, or the acceleration time to be too long. Check to be
sure that the value set for the torque limit is suitable. If the torque limit has been set by multi-function
analog inputs H3-05 and H3-09 (set value: 10 to 13), check to be sure that the analog input value is
suitable.
The stall prevention level during acceleration is too low.
If the value set for L3-02 (stall prevention level during acceleration) is too low, the acceleration time will
be too long. Check to be sure that the set value is suitable.
The stall prevention level during running is too low.
If the value set for L3-06 (stall prevention level during running) is too low, the speed will drop before
outputting torque. Check to be sure that the set value is suitable.
H If the Motor Does Not Operate According to Reference
The motor runs faster than reference.
The frequency reference bias setting is wrong.
The frequency reference bias set in parameter H3-03 is added to the frequency reference. Check to
be sure that the set value is suitable.
Frequency bias is set for multi-function analog inputs.
When "2" (frequency bias) is set for multi-function analog inputs H3-05 and H3-09, a frequency corre-
sponding to the input voltage (current) is added to the frequency reference. Check to be sure that the
set value and analog input value are suitable.
8-16
Chapter 8