Mody Pumps MHMXP 6 X 12 - Manual (Page 15)

The MPMR provides Motor Over Temperature and Seal
Leakage alarm for Mody 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 applies a low voltage AC
signal to the Leakage Probe to detect moisture in the pump
motor. A Seal Leakage condition is considered present
when the amount of moisture in the motor causes the
resistance between the Leakage Probe and the motor
housing 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 from terminal 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 the
Leakage Probe to terminal 6.
OPERATION
P ump M onitor R elay
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, NEMA 1
Phenolic
MADE IN THE U.S.A.
Mody Pumps, Inc. • 2166 Zeus Court, Bakersfield, CA 93308 USA
Tel. (661) 392-7600 Fax: 661-392-7601
www.modypump.com email: [email protected]
ORDERING INFORMATION
Part Number: 660-900-00
SPECIFICATIONS
UL FILE #E101681
C C US
03.10.Rev.0