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P&B MPR3E5 User Manual

P&B MPR3E5
36 pages
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Issue H
MPR 3E5
Digital Motor Protection Relay
P&B Engineering
Belle Vue Works
Boundary Street
Manchester
M12 5NG
Tel: 0161 230 6363

Table of Contents

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P&B MPR3E5 Specifications

General IconGeneral
BrandP&B
ModelMPR3E5
CategoryRelays
LanguageEnglish

Summary

5. Front Panel

7. Operation and Setting

7.1 Layout of the Control Elements

Describes the location and grouping of operational and adjustment elements.

7.2 Relay Display and Setting Procedure

Details how to navigate display modes and access setting procedures.

7.3 Setting Procedure

Details the step-by-step process for configuring various relay parameters.

7.3.1 t6x Setting

Defines the time the relay takes to trip at 6 times FLC based on the cold characteristic.

7.3.2 Speed Switch

Explains how the speed switch reduces operation times during motor stalls.

7.3.3 Full Load Current Setting I FLC

Describes setting the relay to the machine's normal running full load current.

7.3.4 CT Primary Setting

Specifies setting the CT primary rating equal to the line CT rating in primary amps.

7.3.5 Hot/Cold Ratio Setting

Sets the available thermal capacity for a motor running at FLC in the hot condition.

7.3.6 Thermal Overload Pre-Alarm Setting

Activates an alarm relay when thermal capacity reaches the pre-alarm level.

7.3.9 Earth Fault Current

Specifies the pickup level for Earth Fault Current as a percentage of rating.

7.3.10 Earth Fault trip Time

Determines the trip time after the earth fault current exceeds the pickup value.

7.3.11 Unbalance Current

Sets the pickup level for unbalance current as a percentage of FLC.

7.3.14 High Set Overcurrent

Enables quicker trip times for high fault currents, recommended for circuit breakers.

7.3.15 High Set Overcurrent Time

Determines the trip time for measured current exceeding the high set pickup.

7.3.16 Low Set Overcurrent

Allows quicker trip times for fault currents or overloads of medium magnitude.

7.3.17 Low Set Overcurrent Time

Sets the trip time after measured current exceeds the low set pickup value.

9. Commissioning and Testing