SVRS eMod Motors

eMod

The eMod load sensing electronic module is an accessory to a pool pump motor. It is permanently attached to the motor and is used to protect the motor and pump from damage. eMod is SVRS compliant per ASME A112.19.17-2002 for suction lift applications.

The load sensing module can turn the pool pump motor off if the input power to the motor is too low, indicating either a lack of fluid flow, or a dry running pump. It can also turn the motor off if the input power gets too high, indicating excessive load on the pump. The module can also shut the pump motor off if input current is too high, indicating a locked rotor or blocked pump impeller condition.

eMod Set Up

The eMod module is permanently mounted and wired to the motor. All necessary electrical connections are made at the factory.

Basic Operation

While the pool pump is running, the eMod module monitors pump motor input power. If the motor input power drops 10% below its normal running condition value for more than 1 second, the eMod will fault and the pump motor will be turned off. When faulted, the eMod module will flash the red LED on the end of the enclosure.

If the motor input power increases more than 12% over its normal running condition value for more than 4 seconds, the eMod will fault and the motor will be turned off. If either of the out of normal conditions does not last for the required amount of time, however, the fault condition will not be latched, and the motor will continue to run.

Startup Lockout Time

Often times when starting a pool pump, there is air in the plumbing system. If the volume of air is large, it can take a minute or two to fully evacuate the air in the system and prime the pump. To keep the eMod module from detecting a low input power condition (lack of flow) a startup lockout period is employed. When the eMod is powered up, it will ignore the motor power input for up to 3 minutes before it starts to monitor the motor  operating conditions. While the eMod module is in this startup lockout state, the green LED on the end of theenclosure will flash.

If the pump primes faster than the 3 minute limit, the eMod circuitry will detect this and immediately go into running mode. When in run mode, the green LED on the end of the enclosure will be on.

Calibration

Because every pool is hydraulically different, the eMod module must be individually calibrated to each pool installation. The unit will automatically calibrate after running through the 3 minute priming period for the first time. When calibrating the unit, it is important to make sure that the pump is fully primed, and that all valves and filters are in their normal operating conditions. Also make sure that there are no leaves or other obstructions on the pool drains. This will result in the pump motor input power being at its normal operating value.

During the three minute startup lockout time, the green and red LEDs will flash alternately. The alternate flashing LEDs indicates that the eMod unit is in auto-calibrate mode. At the end of the three minute priming period, the eMod will automatically calibrate and go into run mode (green LED on).

If for some reason the pump is not yet fully primed, let the eMod unit fault out. Cycle input power and press the Reset button as discussed below.

Note: It is important that the pump be fully primed and running at normal conditions when the eMod unit is calibrated.
Note: For two speed motors, the eMod must be calibrated at both operating speeds. It is recommended that the eMod be calibrated at both speeds when the motor is initially installed on the pool, and the motor is still cool. 

Test of Proper Calibration

Upon completing the installation of an eMod equipped motor to the pump and pool plumbing, and after calibration is complete, the manufacturer recommends that the unit be tested for proper function. This can be accomplished by either blocking the inlet of the drain or closing a main valve. The motor and the pump should shutdown in less than 10 seconds of this action. The red LED on the eMod unit should also be flashing. Remove the blockage or return the valve to the original position and the unit should begin functioning again in approximately two (2) minutes. It is recommended that this test be performed monthly to assure no changes have occurred in the calibration the pool system.

If the eMod unit does not shutdown the motor and pump in less than 10 seconds, the unit should be Reset. Please refer to the Reset section of the installation guide. Once the unit is Reset, the unit will then calibrate to the new load point once power is applied to the unit. The blockage test should be repeated once the unit has completed the calibration and is operating with a solid green LED illuminated.

Reset

If for some reason it becomes necessary to reset the calibration of the eMod module (change in plumbing or other pool conditions), press the button next to the red LED on the end of the enclosure and hold it down for at least three seconds. Please note that this function is only active during the first three minutes of operation after the power is applied. This will erase the calibration memory and the motor will stop. Cycle power to the unit (wait 10 seconds with the power off to allow the internal power supply to reset). The unit will now go through a new auto-calibration period and then establish new values for motor input power and current, as was discussed in the calibration section above.

Bypass Mode

It may be necessary to defeat the eMod motor input power monitoring functions during unusual operating conditions in the pool. This might include hand wand vacuuming the pool, back flushing of filters or replacement of filters, or clearing a large volume of air from the pool plumbing system. 

To enter Bypass mode, press and hold the Bypass mode button for at least three seconds. The Bypass mode button is located next to the green LED on the end of the enclosure. The eMod will respond by starting to blink the red LED with the green LED on. Bypass mode will last for 30 minutes, or until the Bypass mode button is pushed for at least three seconds a second time. If at any time during the cleaning process the power is cycled off, the Bypass mode button must be pressed again once the power is cycled back on, otherwise the unit believes that cleaning has been completed and has returned to normal operation mode. If the unit stops during any cleaning activity, cycle the power off, wait 10 seconds, power on, and press the Bypass mode to continue cleaning operations.

Caution: Bypass mode defeats the pump monitoring functions of the eMod. While in Bypass mode, there is no protection from a drain blockage suction condition or dry running pump.