Dwyer MPC - Manual (Page 13)

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In the Secure menu the value of PSF is programmed for the action of the MPC based on
the condition of a seal failure. If set to ˝ AUt0 ˝ when pump moisture sensor indicates that
there is a seal failure condition then the corresponding pump seal failure lamp is lit on the
controller. The pump will remain in service with only the lamp indication of failure. The
lamp will be turned off automatically when the seal failure condition has ceased.
If PSF is set to ˝ rES ˝ when pump moisture sensor indicates that there is a seal failure
condition then the corresponding pump seal failure lamp is lit on the controller. If the MPC
is only being used with one pump or being used with two pumps with the lead/lag function
turned off then no action is taken by the MPC with the operation of the pumps. The failure
indication lamp will be manually reset as described in the next paragraph. If the MPC is
being used with two pumps with the lead/lag function turned on then the failed pump will
automatically become the lag pump, the remaining pump will become the lead pump, and
the alternation will be discontinued. The lamp indication and pump alternation can be
manually reset as described in the next paragraph.
Once the pump has been repaired the seal failure action can be reset with the values of
P1SF and P2SF in the Secondary menu. The item P1SF or P2SF will display FA1L if the
corresponding pump has met the condition of a seal failure. Press the ENTER key to
reset. If the pump moisture sensor is still in the fail condition then the control will not reset.
If the moisture sensor is no longer in the fail condition then the display will revert to ˝----˝.
OVER TEMPERATURE OPERATION
Most pumps have an installed normally closed thermostat for over temperature protection
of the pump. The thermostat has a preset value from the pump manufacturer at which
point the pump needs to be shut down. The Mercoid
® MPC detects when the thermostat
signal changes to open and shuts down the pump.
In the Secure menu the value of P0t is programmed for the action of the MPC based on the
condition of the over temperature. When the pump temperature sensor indicates that there
is an over temperature condition the pump will be held out of service and the corresponding
pump over temperature lamp is lit on the controller. If using the MPC with two pumps with
the lead/lag function turned on then the failed pump will automatically be taken out of
service, the remaining pump will become the lead pump, and the alternation will be
discontinued. When controlling two pumps with the lead/lag function off the failed pump will
automatically be taken out of service and the remaining pump will be controlled by the
SP1H
and SP1L set points.
If P0t is set to ˝ AUt0 ˝ then the pump will be automatically placed back into service and
the lamp turned off when the over temperature condition has ceased. If set to ˝ rES ˝ then
the pump will remain out of service and the lamp lit until the corresponding manual reset
P10t or P20t is reset in the Secondary menu (described in the next paragraph). The pump
cannot be brought back into service until the over temperature condition has ceased.
Once the pump has cooled down the MPC Pump Controller can be reset with the values of
P10t and P20t in the Secondary menu. The item P10t or P20t will display FA1L if the
pump has met the condition of over temperature. Press the ENTER key to reset. If the
pump temperature sensor is still in the fail condition then the control will not reset. If the
temperature input is no longer in the fail condition then the display will revert to ˝----˝.
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