Littelfuse MPS - Undervoltage

Page 5-7
MPS Motor Protection System Rev. 6-F-022117
Protective Functions
5.16 UNDERVOLTAGE
OPI Menu: Setup | Protection | Undervoltage
A trip or alarm occurs if the minimum line-to-line
voltage is less than the set point.
Trip Level ............................. 0.50 to 1.00 x System
Voltage Rating (V
p
)
Trip Delay ............................. 1.00 to 500.00 s
Alarm Level .......................... 0.50 to 1.00 x V
p
Alarm Delay ......................... 1.00 to 500.00 s
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3
Measurement Method ........... DFT
5.17 UNDERPOWER
OPI Menu: Setup | Protection | Underpower
Apparent power (S) is defined by S = P + jQ. A trip or
alarm is initiated when the real power (P) magnitude
remains below the set point for the programmed delay.
Protection is enabled when the motor is in the Run mode.
See Section 7.2.
The Underpower setting is in per unit of rated power
where 1.00 pu is defined as the System Voltage x FLA
Rating x √3. The absolute value of power is used.
Trip Level ............................. 0.10 to 1.00
Trip Delay ............................. 0.50 to 500.00 s
Alarm Level .......................... 0.10 to 1.00
Alarm Delay ......................... 0.50 to 500.00 s
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3
5.18 REVERSEPOWER
OPI Menu: Setup | Protection | Reversepower
Apparent power (S) is defined by S = P + jQ. A trip or
alarm is initiated when the real reverse power (P)
magnitude (negative power) is higher than the set point
for the programmed delay. See Section 7.2.
The Reversepower setting is in per unit of rated power
where 1.00 pu is defined as the System Voltage x FLA
Rating x √3. The magnitude of the negative power is
used and protection is only active when negative power is
detected.
Trip Level ............................. 0.10 to 1.00
Trip Delay ............................. 0.50 to 500.00 s
Alarm Level .......................... 0.10 to 1.00
Alarm Delay ......................... 0.50 to 500.00 s
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3
5.19 POWER FACTOR—QUADRANT 4
OPI Menu: Setup | Protection | PF Quandrant4
OPI Menu: Setup | System Config | I
p
Threshold
A trip or alarm occurs if the absolute value of power
factor in quadrant 4 is less than the set point. In quadrant
4, both Watts and Vars are positive (Importing).
Power-factor protection is active when the motor is in
the Run mode. Run mode is defined in Section 5.1.
The I
p
Threshold sets the point where power-factor
protection becomes active.
Trip Level ............................. 0.50 to 1.00
Trip Delay ............................. 0.20 to 500.00 s
Alarm Level .......................... 0.50 to 1.00
Alarm Delay ......................... 0.20 to 500.00 s
I
P
Threshold .......................... 0.10 to 0.50 x CT-primary
rating (I
P
)
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3
5.20 POWER FACTOR—QUADRANT 3
OPI Menu: Setup | Protection | PF Quandrant3
OPI Menu: Setup | System Config | I
p
Threshold
A trip or alarm occurs if the absolute value of power
factor in quadrant 3 is less than the set point. In quadrant
3, Watts are negative (Exporting) and Vars are positive
(Importing).
Power-factor protection is active when the motor is in
the Run mode. Run mode is defined in Section 5.1.
The I
p
Threshold sets the point where power-factor
protection becomes active.
Trip Level ............................. 0.50 to 1.00
Trip Delay ............................. 0.20 to 500.00 s
Alarm Level .......................... 0.50 to 1.00
Alarm Delay ......................... 0.20 to 500.00 s
I
P
Threshold .......................... 0.10 to 0.50 x CT-primary
rating (I
P
)
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3
5.21 UNDERFREQUENCY
OPI Menu: Setup | Protection | Underfrequency
A trip or alarm occurs when the frequency of the input
voltage (VA) is below the set point.
Underfrequency protection is inhibited when the input
voltage is less than 50% of rated input (V
p
).
Trip Level ............................. 30.00 to 80.00 Hz
Trip Delay ............................. 0.50 to 500.00 s
Alarm Level .......................... 30.00 to 80.00 Hz
Alarm Delay ......................... 0.5 to 500.00 s
Protection .............................. Enable/Disable Trip1, 2, 3
Enable/Disable Alarm1, 2, 3