Hysteresis Setting
Description
Hysteresis Setting are used for calculating reset threshold of protection alarm and pickup.
Pickup or alarm threshold are set by protection settings. For reset threshold calculation LTMT main unit uses Hysteresis Setting.
For example, if overcurrent protection pickup is set at 100% of full load current (IFLC), and if Hysteresis Setting for current protections is set at 3%, the pickup reset threshold level for overcurrent protection is 97% of IFLC.
Over protections:
Under
protections:
Hysteresis is fixed for the following protections:
-
Voltage phase loss - 35% of imbalance
-
Current phase loss - 15% of IFLC
-
Voltage imbalance - 3% of imbalance
Parameter Settings
|
Parameter |
Setting range |
Default value |
|---|---|---|
|
Current protection |
3–15 % in step of 1% |
3% |
|
Voltage protection |
3–15 % in step of 1% |
3% |
|
Frequency protection |
1–15 % in step of 1% |
3% |
|
Power protection |
3–15 % in step of 1% |
3% |
|
Analog input protection |
1–3 mA in step of 1 mA |
1 mA |
|
Temperature protection |
2–15 °C in step of 1 °C |
5 °C |