Mody Pumps MHMXP - Manual (Page 7)

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 detects moisture inside a
pump motor by using a low voltage AC signal to measure
the resistance across Leakage Probes #1 and #2, or
between Leakage Probe #1 and the grounded motor
housing. A Seal Leakage condition is considered present
when the amount of moisture in the motor causes the
resistance between terminals 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 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: 660-901-00
SPECIFICATIONS
UL FILE #E101681
C
C US
08.10.Rev.0