4-36
Open phase protection function selection
This is the function to warn when the inverter input supplies opens.
Function
code
Data
Description
00
Invalid
Don’t trip when the input supplies opens.
b006
01
Valid
Trip when the input supplies opens.
When an open phase occurs, there is a danger that the inverter could produce one of the following states;
(1) Ripple current of main capacitor increases, life of main capacitor shortens remarkably.
(2) In case of load, there is danger that the capacitors or thyristors inside the inverter could be damaged.
(3) There is a risk that the in-rush resistor to limit the current inside the inverter may burn out.
Electrionic thermal function
Set the Inverter according to motor rated current to
protectthe motor from overloading, overheating and
damage.
A warning signal is outputted before tripping on electronic
thermal protection.
(1) Electronic thermal level
Function code
Setting range
Description
b012/b212
Rated Current x 0.2 to
Rated Current x 1.2
Units:A
(Example) L300P-110LFU
Motor current:44A
Setting range:8.8 to 52.8A
When electronic thermal level b012=44A,
time limit characteristic is right diagram.
(2) Electronic thermal characteristic
Frequency characteristic is added up to set value of b012.
Function
code
Deta
Electronic thermal
characteristic
00
Reduced torque
characteristic
01
Constant torque
characteristic
b013/b213
02
Free setting
b006:Open phase selection
Relation code
b012/b212:1
st
/2
nd
electric thermal level
b013/b213:1
st
/2
nd
electric thermal
characteristic selection
b015/b017/b019:free electric thermal frequency 1/2/3
b016/b018/b020:Free thermal current 1/2/3
C021-C022:Intelligent output terminal
C026:Alarm relay output terminal
C061:Thermal warning level
Relation code
Trip time (s)
Motor current (A)
(Ratio for inverter rated
current)
60
0.5
51
(116%)
0
52.8
(120%)
66
(150%)
When output frequency of general motor
decreases, cooling function of self-cooled
fan will fall.
Reduced torque characteristic is calculated
according to heat of a HITACHI general
motor.
Chapter 4 Explanation of function