Hitachi L700 Series, Instruction Manual, Page: 129 / 263

Chapter 4 Explanation of Functions
4 - 67
4.2.64 Over-torque signal (OTQ)
The inverter outputs the over-torque signal when it detects
that the estimated motor output torque exceeds the
specified level.
To enable this function, assign function "07" (OTQ:
over-torque signal) to an intelligent output terminal.
This function is effective only when the V/F characteristic curve selection selected with function "A044" or
"A244" is the sensorless vector control. With any other V/F characteristic curve selection, the output of the
OTQ signal is unpredictable.
When using the inverter for a lift, use the OTQ signal as the trigger to stop braking. Use the
frequency-arrival signal as the trigger to start braking.
Item Function code Set value Description
Terminal function C021 to C025
07 OTQ: Over-torque signal
Alarm relay terminal function C026
Over-torque (forward-driving) level
setting
C055 0. to 150. (%)
Threshold level to output the OTQ signal
during forward powering operation
Over-torque (reverse
regenerating) level setting
C056 0. to 150. (%)
Threshold level to output the OTQ signal
during reverse regeneration operation
Over-torque (reverse driving) level
setting
C057 0. to 150. (%)
Threshold level to output the OTQ signal
during reverse powering operation
Over-torque (forward
regenerating) level setting
C058 0. to 150. (%)
Threshold level to output the OTQ signal
during forward regeneration operation
A044/A244/A344: V/F characteristic curve selection,
1st/2nd/3rd motors
C021 to C025: Terminal [11] to [15] functions
C055: Over-torque (forward-driving) level setting
C056: Over-torque (reverse regenerating) level setting
C057: Over-torque (reverse driving) level setting
C058: Over-torque (forward regenerating) level setting
Related code