MPE PMR1 Quick Start Manual

The Pump Monitor Relay provides Motor Over Temperature and
Seal Leakage alarms for Submersible Pumps.

Motor Over Temperature Alarm - The unit applies a low voltage

DC signal to the Motor Thermal Sensor to check its status. If the
unit detects that the Motor Thermal Sensor contacts are closed
(normal condition), the Overtemp indication remains off, and the
Overtemp Relay is energized closing the contacts between
terminals 2 and 11.

If the Motor Thermal Sensor contacts open (Over Temperature
condition), the Overtemp Indication is turned on and the
Overtemp Alarm Relay is de-energized opening the contacts
between terminals 2 and 11 and closing the contacts between
terminals 2 and 1.

When the High Motor Temperature condition has cleared, the unit
will reset based on the position of Alarm Reset Mode Select
Switch (Auto or Manual). When in the Auto position, the
Overtemp Alarm resets automatically. If the switch is in the
Manual position, the Overtemp Reset Push-button must be
pushed for approximately 1.5 seconds to clear the alarm.

Seal Leakage Alarm - The unit detects moisture inside a pump

motor by using a low voltage AC signal to measure the resistance
between a single (or dual) Leakage Probe(s) and the grounded
motor housing, or across two Leakage Probes. A Seal Leakage
condition is considered present when the amount of moisture in
the motor causes the resistance between terminal 6 and 5 to drop
below the setting on the potentiometer. When this occurs the unit
turns on the Leakage Indication and energizes the Leakage
Alarm Relay closing the contacts between terminals 9 and 10.

The alarm trip point may be set by the following procedure:
Isolate the Leakage Probe(s) from terminals 5 and 6. Connect a
resistor, with the desired trip value, across terminals 5 and 6.
Slowly adjust the potentiometer to the point where the alarm turns
on. Remove the resistor and reconnect to the Leakage Probe(s).

OPERATION

Pump Monitor Relay PMR1

Input Power:
Output Rating:
Operating Temp:
Storage Temp:
Temp Sensor Voltage:
Leak Sensor Voltage:
Enclosure:
Base:

120 VAC ±10%, 7.0 VA max
8A Resistive @ 120VAC

-20°C to +65 °C

-45°C to +85 °C

6.6 VDC ±10%

4.7 VAC ±10%
White Lexan
Phenolic

ORDERING INFORMATION

Part Number: PMR1

SPECIFICATIONS

UL FILE #E101681

2464 Vulcan Road, Apopka, Florida 32703 ⬧ [phone] ⬧ www.mpelectronics.com

MADE IN

THE U.S.A.

Pump Monitor Relay

CONNECTION DIAGRAMS

CHECKS RESISTANCE BETWEEN

TWO PROBES AND MOTOR HOUSING

CHECKS RESISTANCE BETWEEN

TWO PROBES

CHECKS RESISTANCE BETWEEN

ONE PROBE AND MOTOR HOUSING

2464 Vulcan Road, Apopka, Florida 32703 ⬧ [phone] ⬧ www.mpelectronics.com