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We have used the phase failure relays manufactured by Taylor for the past 30 years. Currently, use both the Taylor PD and PND phase failure relays in our current style switchboards. See the attachments for the wiring diagrams, specifications, operating instructions etc. Released for: Schneider Electric USA.
Phase failure relays are often used to control a shunt trip circuit breaker. When this is done, care must be taken to insure that the shunt trip circuit always has an adequate source available. This can be accomplished by using the diagram below. If a phase failure occurs on L2 or L3, the shunt trip coil will draw power from L1 through the control
This modular multi function 3-phase supply control relay is ideal for monitoring of electrical values in industrial and building control panels. It applies to a wide type of industrial automation applications such as hoisting, packaging, lifts, textile, water.
Maximum switching voltage. 250 V AC 250 V DC. Minimum switching current. 10 mA at 5 V DC. Supply voltage limits. 183...528 V AC. Control circuit voltage limits. 12 % + 10 % Un.
Phase unbalances are typically caused by an unbalanced upstream single-phase load that can disturb phase voltages. This condition can also lead to excessive rotor currents and motor damage.
Phase-Guard will automatically reset whenever the cause of the fault has been corrected and balanced voltage is restored. All models include DPDT output relay with 30 amp contact rating. A two line display shows the current state of the relay.
Phase failure detection Time delay type Adjustable 0.1...30 s, +/- 10 % of the full scale value on crossing the threshold Tt ... Schneider Electric declaration of conformity REACh Reference not containing SVHC above the threshold ... 3-Phase Voltage Control Relay Wiring Diagram L1,L2,L3 : Supply to be monitored 11-14,12 : 1st C/O contact of ...
