Product Description
Description: Phase Monitor Relays • Type: Reversal, Loss, Unbalance, Voltage • Coil Voltage: 102-138V • Contact Configuration: 2C DPDT • Mounting: Din Rail / Panel Mount • Contact Current: 10 Amps • Indicator LED: See Datasheet
| Product Information | Resources |
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| Specifications |
| Product Attribute | Attribute Value |
| Type | Reversal, Loss, Unbalance, Voltage |
| Coil Voltage | 102-138V |
| Contact Configuration | 2C DPDT |
| Mounting | Din Rail / Panel Mount |
| Contact Current | 10 Amps |
| Indicator LED | See Datasheet |
| Min Voltage | 77V AC |
| Max Voltage | 152V AC |
| Three-Phase Line-Line Voltage | The Voltage Line-Line knob on the PMDU has two ranges (right): a 190-250V low voltage scale and a 380-500V high voltage scale. The unit auto senses the three-phase line-line voltage when applied and automatically selects the appropriate range. The PMD120 has a single adjustable range of 102-138V and the PMD575 has a single adjustable range of 460-600V. |
| Power Consumption | Less than 40VA. |
| Phase Loss | Unit trips on loss of any Phase A, B or C, regardless of any regenerative voltages. |
| Phase Reversal (Out-of-Sequence) | Unit trips if sequence (rotation) of the three phases is anything other than A-B-C. It will not work on C-B-A. |
| Undervoltage | Adjustable from 80-95% of the line voltage setting. Unit trips when the average of all three lines is less than the adjusted set point for a period longer than the adjustable trip delay. It will reset at +3% of the Undervoltage trip setting. |
| Overvoltage | Fixed at 110% of the line voltage setting. Unit trips when the average of all three lines is greater than the fixed set point for a period longer than the adjustable trip delay. It will reset at 107% of the line voltage setting. |
| Phase Unbalance | Adjustable from 2 - 10% unbalance. Unit trips when any one of the three lines deviates from the average of all three lines by more than the adjusted set point for a period longer than the adjustable trip delay. |
| Response Times | See Datasheet |
| Output Contacts | DPDT 10 A @ 277V AC / 10A @ 30V DC; 1/2HP @ 120/240V AC (N.O.), 1/3HP @ 120/240V AC (N.C.), B300 Pilot Duty, R300 (N.O.) |
| Life | Mechanical: 10,000,000 operations; Full Load: 100,000 operations |
| Temperature | Operating: -28o to 65oC (-18o to 149oF); Storage: -40o to 85oC (-40o to 185oF) |
| Mounting | Mounts on 35mm DIN-rail or panel-mounted with two #8 screws when DIN-rail clips are fully extended from under the enclosure. |
| Reset | As standard, the PMD Series relays are in the Automatic Reset mode. However, they can be set in the Manual Reset mode by connecting an external N.C. switch across terminals 4 and 5. Upon application of line voltage, the PMD Series will go into Manual Reset mode if it recognizes a closure across terminals 4 and 5. After a fault clears, the relay will not reset until the N.C. switch is opened. Note: When the unit is in the Manual Reset mode, the N.C. switch must be opened after each Power-up to reset the relay and resume normal operation. |
| Termination | Cage-clamp screw terminals Plus-minus screws accept flat and phillips head tools Recommended tightening torque of 7 in-lbs; Accepts solid or stranded wire 12-30 AWG |
| Series Features |
| PMD Series PHASE LOSS, PHASE REVERSAL, PHASE UNBALANCE, UNDERVOLTAGE & OVERVOLTAGE |
| Series Description: The PMD Series Three-Phase Monitor Relays continuously monitor all voltages to protect motors and equipment from expensive damage due to phase loss, phase reversal, phase unbalance, undervoltage and overvoltage. These products detect single phasing and unbalanced voltages regardless of any regenerative voltages. Utilizing an advanced microprocessor-based design allows true RMS voltage measurement with full wave monitoring. This provides a more accurate method to measure the voltages, regardless of load type or wave shape, and results in improved protection across more applications. True RMS voltage measurement ensures accurate sensing in most generator and other applications with non-sinusoidal wave forms, eliminating nuisance tripping. Full wave monitoring provides a more accurate method to measure the voltages, regardless of load type or wave shape, resulting in improved protection across more applications. Unlike similar three-phase monitor relays, the PMD Series will continue to function even with a lost phase. They are the only line-powered units in their class to retain fault indication and continuous monitoring of all voltages during a phase loss, increasing the ease of troubleshooting and the level of protection. The PMD Series is a true universal product, with three units that work on a wide variety of adjustable line-line voltages to cover more global applications. Additional knobs allow adjustment of the undervoltage trip point, trip delay, restart delay and unbalance trip point. They utilize an enclosure for DIN-rail mounting that meets IEC Standards. |
| Operation: When the proper three-phase line voltage is applied to the unit and the phase sequence (rotation) is correct, the relay is energized after the Restart Delay is completed. Any one of five fault conditions will de-energize the relay after a delay. As standard, re-energization is automatic upon correction of the fault condition. Manual reset is available if an external momentary N.C. switch is connected to terminals 4 & 5. A bi-color status LED indicates normal condition and also provides specific fault indication to simplify troubleshooting. |
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