What does the output of the relay look like?
The supply voltage applied to terminals A1-A2 is displayed by the glowing green LED. If the measured value exceeds the adjusted threshold value, the output relay energizes and the red LED (overvoltage) and the yellow LED (relay energized) glow.
How is the voltage measured on a relay?
The voltage to be monitored (measured value) is applied to terminals B-C. The supply voltage applied to terminals A1-A2 is displayed by the glowing green LED. If the measured value drops below the adjusted threshold value, the output relay energizes, the red LED flashes W (undervoltage) and the yellow LED (relay energized) glows.
What are the voltage ranges of cm-ESS relays?
Type Rated control supply voltage Measuring ranges Order code CM-ESS. 1 24-240 V AC/DC 3-30 V, 6-60 V, 30-300 V, 60-600 V 1SVR 430 830 R0300 110-130 V AC 1SVR 430 831 R0300 220-240 V AC 1SVR 430 831 R1300 Accessories
What kind of voltage monitoring relays do ABB use?
This range includes voltage monitoring relays for over- and undervoltage protection from 3 V to 600 V. Incorporating ABB’s long-term experience, the CM range provides your electric installation with the highest safety and reliability.
What is the purpose of an overvoltage relay?
Overvoltage Relay. Provides protection to equipment that cannot handle excess voltages. Uses a normally closed contact (N.C.). As long as the monitored voltage remains below the maximum voltage the equipment can withstand (Pick-Up Setting), the relay remains de-energized and the N.C. contact remains closed, keeping the load energized.
Why do you need a voltage band relay?
Voltage Band Relays provide protection to equipment that is required to operate within an upper and lower voltage limit. As long as the operating voltage remains within an OVER & UNDER voltage range, the internal relay stays energized.
What does an over and under relay do?
Over & Under Voltage Relay (Voltage Band) Voltage Band Relays provide protection to equipment that is required to operate within an upper and lower voltage limit. As long as the operating voltage remains within an OVER & UNDER voltage range, the internal relay stays energized.
Do you have ground to the red / blue wire?
If you do have ground there than you have to test the 4 wires going to the compressor relay. You should have 12 volts at the White and the Black/Yellow wire at the relay. By giving ground to the Red/blue at the relay you should than see 12 volts at the Red wire off the relay. Reply to lorunner’s Post: I do not have ground to the red/blue.