Veichi JT550 Series Manual page 114

Chapter 7 Maintenance and Troubleshooting
Forward max.freq in torque
Fb.13
Reverse max.freq in torque
Fb.14
Two parameters are used to set the max.freq in forward or reverse rotation in torque control mode.
In torque control, if the load torque is smaller than the motor output torque, the motor's rotational
speed will rise continuously. To avoid runaway of the mechanical system, the motor maximum rotating speed
must be limited in torque control.
You can implement continuous change of the maximum frequency in torque control dynamically by
controlling the frequency upper limit.
Fb.15 Acceleration time in torque control
Fb.16 Deceleration time in torque control
In torque control, the difference between the motor output torque and the load torque determines the
speed change rate of the motor and load. The motor rotational speed may change quickly and this will result
in noise or too large mechanical stress. The setting of acceleration/deceleration time in torque control makes
the motor rotational speed change softly.
However, in applications requiring rapid torque response, set the acceleration/deceleration time in
torque control to 0.00s. For example, two inverters are connected to drive the same load. To balance the load
allocation, set one inverter as master in speed control and the other as slave in torque control. The slave
receives the master's output torque as the torque command and must follow the master rapidly. In this case,
the acceleration/deceleration time of the slave in torque control is set to 0.0s.
Group FC: Multi-Reference and Simple PLC Function Parameters
FC.00
FC.01
FC.02
FC.03
FC.04
FC.05
FC.06
FC.07
FC.08
FC.09
FC.10
FC.11
FC.12
FC.13
FC.14
FC.15
Multi-reference can be the setting source of frequency, V/F separated voltage and process PID. The
multi-reference is relative value and ranges from -100.0% to 100.0%.
As frequency source, it is a percentage relative to the maximum frequency. As V/F separated voltage
source, it is a percentage relative to the rated motor voltage. As process PID setting source, it does not require
conversion.
Multi-reference can be switched over based on different states of DI terminals. For details,see the
descriptions of group F2.
FC.16 Simple PLC running mode
0: Stop after the inverter runs one cycle
1: Keep final values after the inverter runs one cycle
2: Repeat after the inverter runs one cycle
When simple PLC is used as the frequency source, whether parameter values of FC.00 to FC.15 are
positive or negative determines the running direction. If the parameter values are negative, it indicates that
the inverter runs in reverse direction.
control
control
Reference 0
Reference 1
Reference 2
Reference 3
Reference 4
Reference 5
Reference 6
Reference 7
Reference 8
Reference 9
Reference10
Reference11
Reference12
Reference13
Reference14
Reference15
Range:0.00Hz to
maximum frequency
Range:0.00Hz to
maximum frequency
Range:0.00s~65000s
Range:0.00s~65000s
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:-100.0%~100.0%
Range:0~2
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JT550 Series Inverter Manual
Default:50.00Hz
Default:50.00Hz
Default:0.00s
Default:0.00s
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0.0%
Default:0