TPG CA-203A, Operating Manual

Page: 37 / 109

Chapter 5 Function parameter
68
current limiting
During the operation of Inverter, due to the load is too large, the actual rising rate
of motor speed is lower than the rising rate of output frequency.If no measures taken, it
will cause acceleration overcurrent fault and afterwards cause the inverter trips.
During the operation of inverter, automatic current limiting function detects the
output current, and compares with the current limiting point defined by F8.00.If the
output current exceeds the current limiting point, the output frequency of inverter will
fall in accordance with the falling rate (F8.01
） of over current frequency.When it is
detected again that the output current is below the current limiting point, then it
resumes normal operation.
Frequency fall
rate depends on
F8.01
t
t
Output
frequency
Output
current
Current limiting always
valid
0
F8.02
Current limiting action
selection
Current limiting invalid at
constant speed
1
0
☆
Automatic current limiting function is always valid at the state of acceleration and
deceleration, automatic current limiting action selection (F8.02) is used to determine
whether automatic current limiting function is valid or not at constant speed.
F8.02 = 0 indicates that automatic current limiting is valid at constant speed;
F8.02 = 1 indicates that automatic current limiting is invalid at constant speed;
When performing automatic current limiting action, the output frequency may
vary, so the automatic current limiting function is not suitable for the occasion that the
more stable output frequency at constant speed is required.
When the automatic current limiting function is valid, the lower limit setting may
affect the overload capacity of inverter.
OFF 0
Ordinary motor (with low
speed compensation)
1
F8.03
Motor overload
protection selection
Inverter motor (without
low speed compensation)
2
2 ★
0: OFF No motor overload protection (be caution), at this time, the inverter has
Chapter 5 Function parameter
69
not overload protection to load motor.
1: Ordinary motor (with low speed compensation) As the cooling effect of
ordinary motor at low speed gets worse, the corresponding electronic thermal
protection value should be adjusted as appropriate, as mentioned here with low
compensation, it refers to lower the overload protection threshold of motor that the
running frequency is less than 30HZ.
2: Inverter motor (without low speed compensation) Because the cooling
function of the inverter dedicated motor is not affected by speed, the low-speed
protection adjustment is not required.
F8.04
Motor overload
protection current 20.0% to 120.0% (rated motor
current)
100.0% ☆
The formula of motor overload protection current:
Motor rated current * F8.04 * 158%, lasts for 10 minutes and then alarms motor
overload;
Motor rated current * F8.04 * 200%, lasts for 1 minutes and then alarms motor
overload;
Prohibit 0
F8.05
Overvoltage stall
protection
Allow 1
0
☆
When the inverter decelerates, due to the effects from load inertia, it may occur
that the actual falling rate of motor speed is lower than the falling rate of output
frequency, at the time the motor will feed back the power to the inverter so that the
inverter bus voltage rises, if no measures are taken, the rising of bus voltage will cause
the inverter overvoltage fault.
110 to 150% (220V series) 115%
F8.06
Overvoltage stall
protection voltage
110 to 150% (380V series) 130%
☆
Overvoltage stall protection voltage refers to that during the operation, the inverter
detects the bus voltage and compares it with the overvoltage stall point defined by
F8.06 (relative to a standard bus voltage), if the bus voltage exceeds the overvoltage
stall point, the inverter's output frequency will stop droping until that the bus voltage is
below detection overvoltage stall point, and then continues to decelerate.
F8.07
Number of automatic
fault reset
0 to 3 0
☆
F8.08 Automatic fault reset
interval setting
0.1 to 100.0s 1.0 s ☆
Number of automatic fault reset: when the inverter selects automatic fault reset, it
is used to set the number of times of automatic fault reset. When the times of the
inverter continuous reset exceed this value, the inverter fault standby, the manual
intervention is required.
Automatic fault reset interval setting: choose interval between fault occurrence
and automatic reset.
F8.09 Descending frequency 70.0 to 110.0% (standard bus 80.0% ☆