Overvoltage Suppression Diagram; Bus Under-Voltage Protection Point; Input Phase Loss Threshold; Power-To-Ground Short-Circuit Detection - Veichi AC300 Series Technical Manual

AC300 Series Vector Control Inverter Manual

Overvoltage suppression diagram

F10.09 Bus under-voltage suppression function
F10.10 Bus under voltage suppression point
F10.11 Bus under voltage suppression gain
When bus voltage reaches or lower than [F10.10] when inverter running, the inverter will automatically adjust the
operating frequency and suppress the bus voltage from decreasing, thus ensuring there's no LV protection due to low
bus voltage. Adjusting [F10.11] can promote LV suppression effect; set [F10.09] = 0: cut-off LV suppression function
and LV suppression is valid for any motor control mode.
F10.12

Bus under-voltage protection point

Bus under-voltage protection point: This parameter specifies the lower voltage allowed by bus voltage during
operation, for some low power occasions, appropriate under-voltage protection level can be reduced to ensure the
normal working of the inverter.
Note: When the grid voltage is too low, the motor output torque will decrease. For constant power load and
constant torque load, low grid voltage will increase the frequency converter input and output current, thereby
reducing the reliability of the inverter operation.
F10.13

Input phase loss threshold

Input phase loss threshold: When the input phase loss detection function is turned on, when the field voltage
fluctuation is large, the threshold value can be appropriately increased without affecting the normal operation of the
machine.
F10.14

Power-to-ground short-circuit detection

LED "0" digit: short circuit to ground When the motor connected to the inverter is short-circuited to ground, it will
report the output phase loss fault E.SG.
0: off
1: Power-on detection
2: Test every run
LED "00" digit: fan short circuit When the inverter fan short circuit occurs when the fan is short-circuited (or 24V
short circuit), the inverter will restart 2 times. Will report the output phase loss fault E.FSG,
0: off
1: open
LED "000" digit: Reserved
Function Parameter Specifications
Setting range: 0~1 Factory default: 0
T3: 350-450 (default 430)
Factory default: 80.0%
T2/S2: 180-260 (default 240)
Setting range: 0.0-500.0% Factory default: 100.0%
Setting range:60.0-90.0% Factory default: 60.0%
Setting range: 0.0% to 30.0% Factory default: 10.0%
Setting range: 0000-0012 Factory default: 0011
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AC300 Series Vector Control Inverter Manual
LED "0000" digit: Reserved
F10.15 Phase loss protection Setting range: 0000-0021
LED "0" digit: output phase protection:
0: Close
1: Open
LED "00" digit: input phase protection:
0: Off
1: Open the alarm
2: Open the fault
LED "000" digit: Reserved
LED "0000" digit: Reserved
F10.16 Motor overload protection curve coefficient
Long term motor overload would produce serious heat, [F10.16] sets the coefficient of load motor overload protection
or thermal protection; the motor overload protection and motor current curve was inverse, protection curve when F10.16
= 100.0% is shown as follows:
Protection time
60min
2min
120%
The current entering protection curve= (the real motor current / oL protection coefficient)x110%
So increasing [F10.16] can improve motor overload; overload pre alarm coefficient can be set by [F10.16], when the
motor had reached the degree of overload factor [F10.16] setting, the inverter outputs alarm by terminal, for details
please see Y terminal function.
Note: When a inverter parallel with several motors in operation, th the thermal relay protection function will
have no use, in order to effectively protect the motor, please install the thermal protection relay at the end of
each motor.
Function Parameter Specifications
Factory default: 0011
Set range: 0.0-250.0% Factory default: 100.0%
185%
Current
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