Where overload protection is already provided for a pump, this may be complemented by adding a single load loss protection relay in the guise of the UCR 80 undercurrent protection relay from NewElec. These relays are very effective in providing load loss protection for pump applications or any other situation requiring the monitoring of motor load. The relays can for instance be used to measure the efficacy of motors with regard to impellor wear.
On new applications the comprehensive pump motor protection type KC relay affords an excellent platform for effective protection that includes overload, load loss, under voltage, over voltage and running stall protection. Phase loss and unbalance protection as well as the optional capability for automatic restarting of a pump that has run dry after a user selected time period is also bundled into this relay.
DIN rail-mounted, these relays offer a very small footprint and they are equipped for remote reset. Control panel mounted latched fault diagnosis LEDs provide maintenance staff with the necessary information to clear the indicated faults.
For smaller pumps not drawing in excess of 25 A, the on-board integrated current transformers are all that is necessary for protection. Larger motors will require the installation of interposing current transformers whose 5 A secondary circuit is wound through the on-board CTs of the relay.
These relays are designed for motor full load currents of up to 200 A and are an ideal selection for the protection of pumps.
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