Mpc2000D Measured Inputs; Power Supply (Live-1, Neutral-2, Earth-Case); Vt Inputs (L1-13, L2-14, L3-15, N-16-If Used); Ct Phase Inputs (21,22,23,24,25,26) - P&B MPC2000D Manual

5. MPC2000D Measured Inputs

5.1. Power Supply (Live-1, Neutral-2, Earth-Case)

The MPC2000D can be supplied for 110v AC or 240v AC and provides the selected A.C. voltage to all external
inputs.
The MPC2000D monitors the power supply assumed to be derived from the primary side of the contactor within the
starter cubicle or from the MCC busbars to provide an Undervoltage Dip Restart facility. When enabled in the System
Settings page the MPC2000D monitors the supply and in the event of a failure will maintain the start signal to the
motor for upto 200 msec, beyond 200 msec the unit will trip the motor and should the Power supply be restored
within 4 seconds the unit will restart the motor after a time delay set in the Undervoltage Settings page. Should the
voltage not be restored within 4 secs the motor will not be automatically restarted
A DC version (30V DC, 100V DC) can also be supplied as an optional extra, other voltages are available on request.,
If a DC voltage is used the Undervoltage Dip Auto-restart facility cannot be used

5.2. VT Inputs (L1-13, L2-14, L3-15, N-16-if used)

The MPC2000D monitors single or three phase voltage, which can be directly connected for voltages upto 660v and
via a suitable voltage transformer for system voltages above 660v . In order that the MPC2000D can measure and
display actual volts, the system volts and VT primary and secondary volts must be set in the 'System Settings' page.
If single phase voltage reference only is available this is connected to L1(13) and N(16) with L1,L2,L3(13,14,15)
commoned. The 'System Voltage ' setting in the 'System Settings' page must then be set to 1.732 x the line voltage. In
addition the Phase Sequence and Phase Loss protective functions must be disabled

5.3. CT Phase Inputs (21,22,23,24,25,26)

The MPC2000D can be supplied for use with either 5A or 1A CT secondaries. (To be specified)

5.4. Earth Fault CT Inputs (27,28)

The MPC2000D can detect earth faults using either a separate core balance CT or by connecting the 3 phase CT's
residually. Either 5A or 1A CT secondaries must be specified. This will provide a sensitivity better than 1% of the
.
motor FLC. Please note that the Earth Fault value is not displayed on the MPC2000+ till it reaches a value greater
than 50% of the lowest Earth Fault Trip value.
When residually connected phase CT's are used a swamping resistor may have to be fitted in the common
connection. Refer to P & B Engineering for further information.

5.5. Temperature Inputs

5 Channel (39,40,41-42,43,44-45,46,47-48,49,50-51,52,53 (11,12 Screen))
Thermistors of either positive or negative temperature coefficients can be directly connected to the MPC2000D by
selecting either PTC or NTC in the default menu. The alarm and tripping range can be adjusted between 100 ohms
and 30,000 ohms.
RTD's can also be directly connected to the MPC2000D and selecting between the two inputs is via the front plate
keypad. As the resistance of RTD's is relatively low, the MPC2000D use a three wire measurement system for each
RTD, the third wire is required to compensate for the wire resistances. The alarm and tripping range of the RTD's can
be adjusted between 100 ohms and 240 ohms. Default setting is for RTD inputs.
In addition to selection of Thermistor or RTD temperature inputs via the Temperature setting page, dip switches
located behind the rear cover of the MPC2000D require setting. This can be carried out on site, however it is
advisable to specify the type being used, at the time of order such that the change can be made prior to the unit being
despatched.
MPC2000D Issue 2 22/4/98 Page 9