gefran VDI100 Series Instruction Manual page 207

2: Start to detect when the operation is begun
08-18 Selection of low-torque action
0: Deceleration to stop when low-torque is detected
1: Display warning when low-torque is detected. Go on operation
2: Coast to stop when under-torque is detected
08-19 Level of low-torque detection
0~300%
08-20 Time of low-torque detection
0.0~10.0 s
The over torque detection function monitor the inverter output current or motor torque and can be used to de-
tect increase in inverter current or motor torque (e.g. heavy load).
The low torque detection function monitor the inverter output current or motor torque and can be used to detect
a decrease in inverter current or motor torque (e.g. belt break).
The torque detection levels (08-15, 08-19) are based on the inverter rated output current (100% = inverter rated
output current) when operating the inverter in V/f control or V/f control + PG and motor output torque (100% =
motor rated torque) when operating the inverter in SLV or SV control.
Over-torque detection
Parameter 08-13 selects over-torque detection function. An over-torque condition is detected when the output
current / torque rises above the level set in parameter 08-15 (Over-torque detection level) for the time specified
in parameter 08-06 (Over-torque detection time).
08-13=0: Over-torque detection is disabled.
08-13=1: Over-torque detection is enabled when the output frequency reaches the set frequency.
08-13=2: Over-torque detection is enabled during running.
Parameter 08-14 selects the way the inverter acts when an over-torque condition is detected.
08-14=0: When an over-torque condition is detected the inverter displays and over-torque detection fault and
the motor decelerates to a stop.
08-14=1: When an over-torque condition is detected the inverter displays an over-torque detection alarm and
continues to run.
08-14=2: When an over-torque condition is detected the inverter displays and over-torque detection fault and
the motor coasts to a stop
Low-torque detection
Parameter 08-18 selects low-torque detection function. An low-torque condition is detected when the output
current / torque falls below the level set in parameter 08-19 (low-torque detection level) for the time specified in
parameter 08-20 (Low-torque detection time).
08-17=0: Low-torque detection is disabled.
08-17=1: Low-torque detection is enabled when the output frequency reaches the set frequency.
VDI100 • Instruction manual
Figure 4.4.73 Over-torque detection operation
Inverter output current
( or motor output torque)
Detection level (08-15)
Overtorque
detection
signal
08-16
10% hystersis
width
t
t
08-16
207