N700 Operating Instructions and Parts Manual
8. Explanation of b-Group
78
8.12
Open phase protection function selection (b026)
This is the function to warn when the input supply for the inverter opens.
Code
Function name Initial value
Unit
Setting range
Contents
0
Invalid: Do not trip when the input supply
opens.
b026
Open phase
protection
selection
0 -
1
Valid: Trip when the input supply opens.
Table 8- 17 Open phase protection function selection (b026)
NOTE)
When an open phase occurs, there is a danger that the inverter could produce one of the
following states.
①
The ripple current of main capacitor increases and the life of main capacitor shortens
remarkably.
②
With a load, there is a danger that the capacitors or thyristors inside the inverter may be
damaged.
③
There is a risk that the in-rush resistor to limit the current inside the inverter may be burnt
out.
8.13
Electronic thermal function (b027~b029)
z
Set the inverter according to motor rated current to protect the motor from overloading,
overheating and damage. A warning signal can be generated before tripping an electronic
thermal protection.
z
The frequency characteristic is set in b028.
(1) Electronic
thermal level
Code
Function name
Initial
value
Unit
Setting
range
Contents
b027
Electronic thermal
level
Irate
A 0.0~999.9
Please, set value less than 2 times of motor
rated current
b227
2nd motor Electronic
thermal level
Irate
A 0.0~999.9
Please, set value less than 2 times of motor
rated current
0
Reduction : Reduced torque characteristic
b028 Electronic
thermal
1
-
1
Constant torque : Constant torque characteristic
0
Reduction : Reduced torque characteristic
b228
2nd motor Electronic
thermal
1 -
1
Constant torque : Constant torque characteristic
b029
Electronic thermal
Warning level
80 % 0~100
0 : Thermal warning is non-effective
Units: %
Table 8- 18 Electronic thermal function (b027~b029)
z
When output frequency of general motor decreases cooling function of self-cooled fan will
fall in general motor.
z
Reduced torque characteristic was programmed according to a Hyundai general motor
heat pattern.
