General Recommendations for
SAER SUBMERSIBLE
INVERTER DUTY MOTORS
SAER MS SERIES
WATER
-
FILLED SUBMERSIBLE MOTORS
START
•
Starting ramp should last approximately 4
-
6 seconds
(from start to reaching the minimum operating fre-
quency of 30Hz
•
A starting ramp that is too short can cause a water
hammer on the plant.
•
A starting ramp that is too long can cause damage to
the motor.
FREQUENCY VARIATION LIMITS PER MINUTE
•
Max number of frequency variations in a minute = 6
STOP
Stopping can be achieved in two ways:
•
Taking away the power source so that the motor stops
by inertia. The intertia method safeguards the motor
but can cause the appearance of water hammers.
•
Setting a stopping ramp to slowly stop the motor
OPERATING FREQUENCY LIMITS
•
Maximum working frequency should never exceed the
nominal frequency of the motor.
•
Minimum frequency should be calculated to ensure mo-
tor cooling and should never be lower than 30Hz.
•
Operating at less than 30Hz can cause serious damage
to thrust bearings, bushings, and motor windings.
SERVICE FACTOR
•
Variations in power supply voltage must be +/
-
5% of
the nominal value
•
Service factor = 1.15 for 60Hz motors.
INSTALLATION
•
Vertical installation only is highly recommended.
•
Motor must be completely submersed in water that is
completely free
-
flowing to ensure adequate cooling of
internal components.
Carry Pumps, Inc.
·
1360 Prospect Ave.
·
Caro, MI 48723
www.carrypumps.com
·
800
-
492
-
2779
·
