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Centrifugal Pumps Description of Features

Centrifugal Pump Electronic Motor Overload Protection
The SMC Flex controller incorporates, as standard, electronic motor
overload protection. This overload protection is accomplished
electronically with an I2t algorithm.
When coordinated with the proper short circuit protection, overload
protection is intended to protect the motor, motor controller, Centrifugal Pump and
power wiring against overheating caused by excessive overcurrent.
The SMC Flex controller meets applicable requirements as a motor
overload protective device.Centrifugal Pump
The controller’s overload protection is programmable, providing the
user with flexibility. The overload trip class consists of either OFF,
10, 15, 20 or 30 protection. Centrifugal Pump The trip current is programmed by
entering the motor full-load current rating, service factor, and
selecting the trip class.
Thermal memory is included to accurately model motor operating
temperature. Ambient temperature insensitivity is inherent in the
electronic design of the overload.
Stall Protection and Jam Detection
Motors can experience locked-rotor currents and develop high
torque levels in the event of a stall or a jam. Centrifugal Pump These conditions can
result in winding insulation breakdown or mechanical damage to the
connected load. Centrifugal Pump The SMC Flex controller provides both stall
protection and jam detection for enhanced motor and system
protection. Stall protection allows the user to program a maximum
stall protection delay time from 0…10 seconds. The stall protection
delay time is in addition to the programmed start time and begins
only after the start time has timed out. If the controller senses that
the motor is stalled, Centrifugal Pump it will shut down after the delay period has
expired. Jam detection allows the user to determine the motor jam
detection level as a percentage of the motor’s full-load current
rating. To prevent nuisance tripping, a jam detection delay time,
from 0.0…99.0 seconds, can be programmed. This allows the user
to select the time delay required before the SMC Flex controller will
trip on a motor jam condition. The motor current must remain above
the jam detection level during the delay time. Jam detection is
active only after the motor has reached full speed.
Centrifugal Pump Underload Protection
Utilizing the underload protection of the SMC Flex controller, motor
operation can be halted if a drop in current is sensed.
The SMC Flex controller provides an adjustable underload trip
setting from 0…99% of the programmed motor full-load current
rating with an adjustable trip delay time of 0…99 seconds.
Undervoltage Protection
The SMC Flex controller’s undervoltage protection will halt motor
operation if a drop in the incoming line voltage is detected.Centrifugal Pump,
The undervoltage trip level is adjustable as a percentage of the
programmed line voltage, from 0…99%. To eliminate nuisance trips,
a programmable undervoltage trip delay time of 0…99 seconds can
also be programmed. The line voltage must remain below the
undervoltage trip level during the programmed delay time.
Centrifugal Pump Overvoltage Protection
If a rise in the incoming line voltage is detected, the SMC Flex
controller’s overvoltage protection will halt motor operation.
The overvoltage trip level is adjustable as a percentage of the
programmed line voltage, from 0…199%. To eliminate nuisance
trips, a programmable overvoltage trip delay time of 0…99 seconds
can also be programmed.Centrifugal Pump The line voltage must remain above the
overvoltage trip level during the programmed delay time.
Centrifugal Pump Voltage Unbalance Protection
Voltage unbalance is detected by monitoring the 3-phase supply
voltage magnitudes in conjunction with the rotational relationship of
the three phases. The controller will halt motor operation when the
calculated voltage unbalance reaches the user-programmed trip
level.
The voltage unbalance trip level is programmable from 0…25%
unbalance.

Centrifugal Pump Excessive Starts Per Hour
The SMC Flex controller allows the user to program the allowed
number of starts per hour (up to 99). This helps eliminate motor
stress caused by repeated starting during a short time period.

Metering
Centrifugal Pump Power monitoring parameters include:

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