Voltage Settings - P&B MPC2000D Manual

Protection Only Mode
This setting range Yes or No with a default setting of 'No', enables the MPC2000D to function either as a motor
protector and controller, or as a motor protection relay only. If the Protection Only parameter is set to 'Yes' the
MPC2000D no longer controls the motor starting/stopping but only provides protection for current, voltage and
Thermistor inputs, but still maintains the data display facilities which are available via the LCD and keypad and via
the RS485 Serial port. In Protection Only mode the MPC2000D control inputs and outputs operate as follows:
Contactor A Output relay is used to provide separate indication of a thermal Overload fault.
Contactor B output relay is used to provide separate indication of Earth Faults.
Aux.1 Output relay is used for giving indication of Alarms.
Aux.2 Output relay is used for tripping and indication of Faults.
Contactor A and Contactor B LED's are permanently off.
A Start is recognised and the LED lit when current is above 1.1 x O/L Setting level after standstill.
Running is recognised only when current is seen by the MPC2000D current inputs.
Stop is recognised when current is below 12% of rated FLC for more than 0.35 sec.
Local Start A and B, Local Stop, Plant Interlock, Isolator and PLC Start A/B logic inputs are disabled and have no
effect on the operation of the MPC2000D.
Emergency Stop logic input can still be used to trip the motor through the trip relay.
The External Fault 2 & 3 inputs can still be used as before.

9.3. Voltage Settings

Undervoltage Setting
This setting range 50-95% in steps of 1% with default setting of 80% of line voltage determines the pick up level of
the Undervoltage protection. When the measured voltages reaches this level for the period equal to the Undervoltage
Delay period a trip will be performed, unless the Undervoltage Restart feature is selected.
Undervoltage Delay
This setting range 0.2-10 seconds in steps of 0.1s with a default setting of 5s determines how long an Undervoltage
condition must be, before a trip occurs.
Undervoltage Restart
This setting range 'Yes' or 'No' with default setting of 'No' allows the MPC2000D to monitors the Power Supply
(Terminals 1 & 2) and detect short voltage outages to provide automatic restart facilities. When set to 'Yes" , on
detection of a voltage dip or loss the MPC2000D will maintain the starting signal to the contactor for 200 msec at
which time the motor will be stopped. If the voltage is then restored within 4 seconds the MPC2000D will restart the
motor after the preset time delay. If the voltage does not return within 4 seconds the motor will not be restarted.
Undervoltage Restart Delay
This setting range 0.2-120 seconds in steps of 0.1s upto 10s and 1 sec above is available if the above is set to 'Yes',
determines the delay before an automatic restart is performed.
Overvoltage Alarm
This setting range 100-120% in steps of 1%, with a default setting of 115% of line voltage determines the pick up
voltage for the Overvoltage alarm function. When the measured voltage reaches this level and remains for 1 second
an alarm will occur.
MPC2000D Issue 2 22/4/98 Page 19