Mitsubishi Electric 800 Series Instruction Manual page 339

(H) Protective function parameter
To further prevent a trip (Pr.154)
• When Pr.154 Voltage reduction selection during stall prevention operation = "0, 10", the output voltage is reduced. By
making this setting, an overcurrent trip becomes less likely to occur. Use this setting when torque reduction does not pose
a problem. (Under V/F control, the output voltage is reduced only during the stall prevention operation is activated.)
• Set Pr.154 = "10, 11" when the overvoltage protective function (E.OV[ ]) activates during stall prevention operation in an
application with large load inertia. Note that turning OFF the start signal (STF/STR) or varying the frequency command
during stall prevention operation may delay the acceleration/deceleration start.
Pr.154 E.OC[ ] countermeasure
0 Effective
1 (initial value) ―
10 Effective
11 ―
CAUTION
 Do not set the stall prevention operation current too low.
Doing so will reduce the generated torque.
 Be sure to perform a test run.
Stall prevention operation during acceleration may extend the acceleration time.
Stall prevention operation during constant-speed operation may cause sudden speed changes.
Stall prevention operation during deceleration may extend the deceleration time.
Parameters referred to ???????
Pr.22 torque limit level page 154
Pr.73 Analog input selection
Pr.178 to Pr.189 (Input terminal function selection)
Pr.190 to Pr.196 (Output terminal function selection)
Pr.858 Terminal 4 function assignment, Pr.868 Terminal 1 function assignment
338
PARAMETERS
E.OV[ ] countermeasure
―
―
Effective
Effective
page 393
page 415
page 370
page 397