Centrifugal Pumps - blog

Centrifugal Pumps Description of Features

Centrifugal Pumps Electronic Motor Overload Protection
The SMC-3 controller incorporates, as standard, electronic motor
overload protection. This motor overload protection is accomplished
electronically with the use of current transformers on each of the
three phases. Centrifugal Pumps The controller’s overload protection is programmable,
providing the user with flexibility. The overload trip class selection
consists of either OFF, 10, 15, or 20. The trip current is easily
selected by adjusting the rotary potentiometer to the motor full load
current rating. Trip reset is selectable to either automatic or manual
mode.
Centrifugal Pumps Note: Trip rating is 120% of dial setting.
Over-temperature
The SMC-3 monitors the SCR temperature by means of internal
thermistors. When the power poles maximum rated temperature is
reached, the microcomputer switches off the SMC, a TEMP fault is
indicated via LED, and the 97/98 fault contact closes.
Phase Reversal Protection
When enabled via a DIP switch, 3-phase input power will be verified
before starting.Centrifugal Pumps If input power phasing is detected to be incorrect,
the start will be aborted and a fault indicated.

Phase Loss/Open Load
The unit will not attempt a start if there is a single-phase condition
on the line. Centrifugal Pumps This protects from motor burnout during single-phase
starting.

Centrifugal Pumps Phase Imbalance
The unit monitors for imbalance between phase currents. To prevent
motor damage, the unit will trip if the difference between the
minimum phase current and the maximum phase current exceeds
65% for 3 seconds, and a fault will be indicated.
Shorted SCR
Prior to every start and during starting, the unit will check all SCRs
for shorts and unit load connections to the motor.Centrifugal Pumps  If there is a
shorted SCR in the SMC-3 and/or open load, the start will be
aborted and a shorted SCR or open load fault will be indicated. This
prevents damage from phase imbalance.

Centrifugal Pumps Push to Test
The unit with control wiring can be tested for fault conditions by
using the Push to Test function. Hold down the Reset button for 7
seconds to activate the fault Aux (97, 98) and shut down the SMC-3.
To clear,Centrifugal Pumps  either push the Reset button or cycle control power to the
device.
Centrifugal Pumps Modes of Operation/Features
LED Description (Number of Flashes)
1. Overload
2. Overtemperature
3. Phase Reversal
4. Phase Loss/Open Load
5. Phase Imbalance
6. Shorted SCR
7. Test

Tags: Centrifugal Pumps