Dry Run pump Protection

All centrifugal pumps, both sealless (canned motor or magnetic drive) and mechanical seal, will fail if they are run dry, so it is critical to invest in an inexpensive and simple technology such as a power monitor which will immediately detect low power draw caused by loss of flow to the suction of the pump and immediately shut the pump down before any major damage can occur. Power monitors can also be set to shut pumps down if it detects high power draw which can be caused by running the pump off the end of the curve or by mechanical contact or rubbing of some kind. The cost of a power monitor is cheap insurance to make sure that your Magnatex pumps, mechanical seal pumps or other rotating equipment will run trouble free for many years to come.

Pump Protectors

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PMP-25 Pump Load Control Installation, Setup and Adjustment

The Model PMP-25 monitors the true power going to a motor.

By sensing power (volts x amps x power factor) rather than just amps, there is much greater sensitivity. For loss of load detection, this means a 10X improvement in performance.


Wiring is done to unpluggable terminal strips on the rear of the unit. There are three ways to mount:

  • On door or raceway - use cutout template
  • Panel mount - use template + optional Bezel Kit (no charge)
  • On wall - on standard outdoor junction box + optional Outlet Box Adapter (no charge)


120 volts AC is taken from two of the phases. If the motor starter already has a 120-volt control transformer with 10VA of free capacity, it can be used. Otherwise, install a separate transformer. It is okay if the secondary is grounded. BE SURE TO NOTE WHICH TWO PHASES SUPPLY THE TRANSFORMER.

In a 120/208V three-phase system, the 120V MUST come from a transformer connected to two of the phases. The 120V phase to ground voltage cannot be used.


The current signal is taken from the REMAINING phase. This current sample passes through the Range Finder Toroid. It is VERY IMPORTANT that the current signal comes from the phase that IS NOT supplying the 120V control transformer. Be extra careful when the machine has reversing starters or multi-speed windings. If a wrong phase is used, the control will either:

  • Work backwards
  • Have reduced sensitivity

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Full scle Capacity at 460 Volts

The Range Finder Toroid has six motor size choices. Select one that is equal or larger than your motor. This will leave some headroom.

  • For motors less than 5 HP (460 volt), take extra turns.
  • For motors greater than 50 HP, use Range Finder Toroid


For nominal voltages other than 460 volts, multiply 460V full scale by:

  • 208V = .45
  • 230V = .5
  • 380V = .83
  • 415V = .9
  • 575V = 1.25
  • For Kilowatts multiply
  • Full Scale HP x .746

Current Transform

For motors sizes or capacities not in table:

%Full Load = F u l l S c a l e C a p a c i t y x 100 Your Motor Size

For Motors Less Than 5 HP

Take more "turns" of the leg through the Toroid. Each time the wire passes through the Toroid is a "turn".

For Motors Greater Than 50 HP

A Current Transformer is used to reduce the primary current. The 5-amp secondary passes through the Toroid.


When current is flowing through the primary of the external current transformer, always have a wire between the two brass Terminals on the CT.

If they are left open, dangerous and destructive voltages can develop.

Hooking up the Reset

Control can be reset three ways:

  • Manually with the Reset button on the control.
  • Remotely with a remotely located reset button or relay.
  • Automatic with a jumper.

Remote Reset

  • Momentarily connect Terminal 4 to Terminal 6 for low
  • Momentarily connect Terminal 5 to Terminal 6 for high

Automatic Reset

Jumper Terminal 4 or 5 to Terminal 6

The terminals for Reset generate a small amount of current (8-12 milliamps). To reset, you just need to connect the terminal to the circuit common (Terminal 6).

The switches or relays that you use must be suitable for low current (Gold flashed contacts, Reed Relays, Mercury Switches).


The Analog Output is directly proportional to Full Scale capacity. It is always active. 500 ohm maximum connected impedance.

Terminal 2 - 4-20mA - Positive

Terminal 3 - 4-20mA - Negative

Use twisted pair or in noisy environments, use shielded cable. Ground shield at other end.

Use the Full Scale capacity from the chart to scale external meter, chart recorders or computers.



  • After hook-up, find your HP, KW or % from the chart.
  • Decide if you want to display HP, % or KW.
  • The Scalecycles through the choices shown below and blinks slowly for each choice. Each press of Scalemoves you to the next choice


1.None of the settings will be changed until you hold down and the fast blinking stops.

2.Five seconds after you have pressed a button, the control will return to normal operation.

3.If you hold down the digits will continue to change.

4.You only need to do when you install the PMP-25 (or if you change the hook-up).


SET POINT - HIGH: The HIGH relay will switch when the load is above the HIGH.

SET POINT - LOW: The LOW relay will switch when the load is below the LOW.

Start-up Timer

The Start-up Timer bypasses the Control during motor startup to avoid false trips because of current inrush. For convenience, the TIMING BEGINS WHEN THE MOTOR STARTS. The Start-up LED stays lit until the start-up period is over.

The start-up time should be:

  • Long enough so that the load has stabilized.

Delay Timers

To avoid nuisance trips from short overloads, Delay Timers bypass the Control for the selected time. The relays won't trip until the time is exceeded. If the trip condition goes away before the time is up, the timer resets to zero.

  • Start with minimum Delay. If you are getting trips where you don't want them, increase the Delay Time.


cycles through the choices. The LED for each choice will turn ON.To change a setting, use

Press ENTER until quick blinking stops to store your new choice.

After 5 seconds if you haven't pressed any buttons, control will return to normal operation.


Use the recommended minimum and maximum flows and horsepower for your initial set points.

Actual Operation

Low Trip - Run the pump with the OUTLET valves closed. This is the minimum flow. Set the low trip about here. High Trip - Run the pump with all valves wide open. This is the maximum flow. Set the high trip about here.

  • Make adjustments if you get nuisance trips.

V-Series Control System The UPC and V-Series Load Controls Protect equipment driven by Variable Speed Motor Drives

V-Series Load Controls and UPC Power Cells are used together to protect equipment in Variable Speed motor drive applications. The UPC monitors motor power and sends a 0-10V signal to the V-Series Load Control. Each Load Control has adjustable set points and relay outputs. The set point configuration differs depending on the application and is called out by a specific model number.

The UPC measures True Power ( Watts ) on the output side of AC or DC motor drives and is field scaleable from small motors to 150 HP. Response time is field adjustable from 500 ms to 12 Sec. The UPC-FR has a fast Response time field adjustable from 50 ms to 1.2 Sec.

The V-Series Load Controls read the measured load on a digital display in either HP, KW or % Load. The meter also reads the set point and delay settings during setup. A HIGH trip set point will trip an output form C relay on an increase in load and a LOW trip set point will trip an output form C relay on a loss of load. Reset can be done manually, remotely with a switch or automatically using jumpers on the resets. A 4-20ma analog output is also provided.

  • PFR-1550V - Has one adjustable set point that can be programed for either HIGH trip or LOW trip.
  • PFR-1750V - Has two adjustable set points that are configured for HIGH trip.
  • ROC-50V - Has two adjustable set points. One is configured for HIGH trip (Max. Limit) and the other is a RATE OF CHANGE set point that reacts to fast acting loads like jam conditions on conveyors, indexing equipment etc. Use with UPC-FR for Fast Response.
  • PMP-25V - Has two adjustable set points configured for HIGH trip and LOW trip.


*The 0-10V signal (terminals 2 and 3) from the UPC power cell wires to the V-Series Load Control (terminals 8 and 7). A shielded signal wire should be used and the shield connected to GROUND at one end. *Relay outputs on the V-Series Load Control are shown with POWER ON and NOT TRIPPED. The trip condition is the shelf state.


  • 4-20MA Analog Output
  • Analog Ground
  • 10V Analog Output
  • Chassis Ground
  • 120VAC
  • L1
  • L2
  • L3

V-Series Back View

  • 4-20MA Analog Output
  • Analog Ground
  • 10V Analog Output
  • Chassis Ground
  • 120VAC
  • L1
  • L2
  • L3

V-Series Control


  • Relay 1 N.O.
  • Relay 1 N.C.
  • Relay 1 Com.
  • Relay 2 N.O.
  • Relay 2 N.C.
  • Relay 2 Com
  • 120 VAC
  • 120 VAC

The Mounting Template ships with the V-series control and is used to mark hole punches for mounting on the outside of a panel door or raceway. To mount behind panel door or raceway use template to make a rectangular cut out and the BEZEL is used. Ask for the BEZEL kit when ordering ( no charge ). Gaskets are provided for both mounting options to maintain NEMA 4 integrity.

The OUTLET BOX ADAPTER is used for a surface or backplane mount. This adapter will adapt to an OUTLET BOX so the V-Series connectors are spaced off the backplane of the panel. Ask for OUTLET BOX ADAPTER when ordering (no charge). Gaskets are provided.