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| Current and Voltage Controls Frequency Monitoring Control Type EFA * Microprocessor-based frequency measurement * 10-position rotary switch for selection of bandwidth * Separate setting of upper/lower limits * Monitors on own power supply * 2 separately adjustable time functions (0.1-30 s) * Quartz-controlled digital circuit * Selectable centre frequency 50/60 Hz * Output: 2 x 5 A SPDT relays (one relay for each level) * For mounting on DIN-rail in accordance with DIN/EN 50 022 * 45 mm Euronorm housing * LED-indication for power supply ON * Two LED's indicating fault and/or status of relay output (flashing when timing) * Galvanically separated power supply Product Description EFA is monitoring the frequency of an AC power supply with the possibility of separate adjustment of upper/ lower limits. This relay offers the user many application possibilities e.g. in connection with wind-driven generators or similar equipment. Ordering Key Housing Function Type Output Power supply EFA C 230 Type Selection Mounting For DIN-rail Output 2 x SPDT Measuring range 50-60 Hz Supply: 24 VAC EFA C 024 Supply: 115 VAC EFA C 115 Supply: 230 VAC EFA C 230 Input Specifications Input Through terminals A1 & A2 Measuring range Bandwidth selectable by 2 separate rotary switches Measuring on own power supply Upper level Lower level 0.5 Hz 1.0 Hz 1.5 Hz 2.0 Hz 2.5 Hz 3.0 Hz 4.0 Hz 5.0 Hz 6.0 Hz 10.0 Hz 0.5 Hz 1.0 Hz 1.5 Hz 2.0 Hz 2.5 Hz 3.0 Hz 4.0 Hz 5.0 Hz 6.0 Hz 10.0 Hz Output Specifications Output Rated insulation voltage Contact ratings (AgCdO) AC 1 Resistive loads DC 1 Small inductive loads AC 15 DC 13 Mechanical life Electrical life 2 x SPDT relay 250 VAC (contact/elect.) (micro gap) 5 A, 250 VAC 5 A, 24 VDC 2 A, 250 VAC 3 A, 24 VDC 40 x 106 operations 105 operations (at max load) 7200 operations/h Operating frequency Dielectric strength Dielectric voltage 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s) Supply Specifications Power supply Rated operational voltage Through pins A1 & A2 024 115 230 Voltage interruption Dielectric voltage Rated impulse withstand voltage Rated operational power Overvoltage cat. III (IEC 60664) (IEC 60038) 24 VAC 15%, 40 to 70 Hz 115 VAC 15%, 40 to 70 Hz 230 VAC 15%, 40 to 70 Hz 40 ms 2 kVAC (rms) 4 kV (1.2/50 s) 3 VA Specifications are subject to change without notice (26.10.99) 1 EFA General Specifications Power ON delay Power OFF delay Reaction time Accuracy Frequency Time delay Temperature drift Hysteresis Indication for Power supply ON Output ON Environment Degree of protection Pollution degree Operating temperature Storage temperature Weight Screw terminals Tightening torqu Approvals 200 ms > 250 ms @ 230 VAC 400 ms 0.01% 0.1-30 s 15% 0.01%/C ( 0.006%/F) 0.5% LED, green 2 LED's, yellow (indicating upper/lower level) IP 20 3 -10 to +50C (-14 to +122F) -50 to +85C (-58 to +185F) 250 g Max. 0.5 Nm acc. to IEC 60947 UL, CSA Mode of Operation EFA measures the frequency of its own sinusoidal power supply, and the output relay is energized as long as the frequency is within the set upper/lower limits. This is indicated by the two built-in yellow LED's. If the frequency rises above the set upper limit, then the centre yellow LED starts to flash and the output relay releases after the set time period. If the frequency drops below the set lower limit, then the right yellow LED starts to flash and the output relay releases after the set time period. There will be no LED-indication after the time delay has expired. EFA has a power ON delay of approx. 200 ms to prevent the relay from operating under inrush conditions. Wiring Diagram Range/Time Setting Range setting Upper left knob: Setting of upper limit on rotary switch. L Time setting Lower right knob: Setting of time delay on absolute scale (0.1-30 s) for lower frequency range. Centre right knob: Setting of time delay on absolute scale (0.1-30 s) for upper frequency range. Lower left knob: Setting of lower limit on rotary switch. Frequency range setting Upper right knob: Rotary switch for selection of frequency range. N Operation Diagram Power supply Upper frequency limit Hysteresis Lower frequency limit Hysteresis Relay 2 upper ( 25/26/28) Relay 1 lower ( 15/16/18) 2 Specifications are subject to change without notice (26.10.99) |
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