METRON MP430 Series, Manual

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PART III: OPERATION OF THE CONTROLLER
A. When the controller is in the "Auto" mode, the main circuit breaker and isolation switch are in the "On" position, the controller
is in standby condition ready to start the pump automatically. A green pilot light above the "Auto" button will illuminate in
this mode. Also, the Power On light should be ON indicating that all power is available and the controller is ready to start the
pump.
When the water pressure drops below a level, which is set in System Config Screen 101, the Controller will actuate the starting
sequence based on the Model of the controller selected in Screen 301. If the pump fails to start after a set time delay (Screen
#103), the
"Pump Failed to Start" light will illuminate, and the alarm horn will sound. In addition, the "System Fault” light
will illuminate.
The panel is wired so that optional remote start switches may be used, such as Deluge Valve, Remote Start pushbutton, Fire
Alarm switches, etc. The Deluge Valve Switch Option (Screen #124), is a normally closed switch that when opened starts the
pump similar to the pressure drop start. In addition, when “Supervisory Power Failure Startup” feature is enabled (System
Config Screen 116), the Controller will automatically start the pump upon loss of a Separate 120VAC Supervisory Power, after
an adjustable time delay (System Config Screen 117).
If the pump stops while running, and there is still an auto start demand, the control will attempt to restart the pump. If the pump
fails to start the
"Pump Failed to Start" light will illuminate and the alarm will sound. If, while the pump is operating, the
motor current exceeds a set overload value (Screen #319), the “Motor Overload” light will illuminate and the alarm will sound
indicating motor overload.
The Controller may be configured as either "Manual" or "Automatic" stop as required (System Config Screen 104).
"Manual" stop is set as standard. When Automatic stop is enabled the stop timer is preset at the factory to 10 minutes. Longer
time settings can be set in System Config screen 105. When “Automatic Stop” is disabled, the pump will continue to run even
though the pressure switch or other remote starting switch returns to its normal position. The pump can be stopped immediately
only by pressing the stop button or by pressing the
Off mode button. If set up for "Automatic" stop, the pump will be stopped
automatically upon restoration to normal of whatever demand switch started the pump providing it has run at least 10 minutes or
longer as set in System Config screen 105. If the demand period was less than the time set on the auto stop timer, the pump will
continue to run until the timer times out and then will stop.
B. When the "Test" mode button is pressed for two or more seconds, the pump will be started by causing a drop in water pressure
if the Solenoid Drain Valve Option (Screen #108) is selected. If the Solenoid Drain Valve Option is set to NO, the unit will start
automatically similar to the Deluge Valve switch start feature. Failure alarm circuits will be operative in the
"Test" mode. This
method of starting provides a test of the Controller, thereby assuring proper operation when required. The pump will run
continuously in this position until the
"Stop" push button is pressed or the “OFF” mode button is pressed.
C. Periodic Self Testing - The Weekly Test Start Timer can be set to give test runs on any day of the week and time of day desired.
A timing element is incorporated in the controls so that when the pump starts in this manner, it will run for a definite time before
it shuts down. See System Config Screens 109 through 112 to set the starting time and length of pump running. See item B.
above. The Weekly test feature will also use the Solenoid Drain Valve option to start the pump if it is enabled as described in B.
above. If Screen #113 (Stop Motor During Test on Alarm) is set to Yes, the motor will be stopped should any alarm condition
occur during the weekly test operation.
D. Provision for sequential starting is accomplished by the use of adjustable time delay on pressure drop starting or “Deluge Valve”
starting. On Multiple Pump installations these timers are set sequentially and progressively longer in time to prevent more than
one (1) pump from starting simultaneously with another pump. Failure of the lead pump to start will not prevent subsequent
pumps from starting. The time delay on starting is set in System Config Screen 103.
E. Emergency Manual Operation: Emergency manual operation is provided in case of failure of control circuitry. This lever is
manually moved to the "On" position and must be manually latched in the "ON" position or it will return to "Off" when released.
The lever should be moved from the "Off" position to the "On" position in as quickly a motion as possible to prevent burning the
contacts. The circuit breaker should be turned off to disconnect the circuit before releasing emergency lever. This lever is for
emergency use only. A mechanical interlock switch is connected to the emergency lever to operate the contactor electrically when
all circuitry is functioning properly. This is provided to prevent inadvertent slow closing of contactor and burning of contacts.
F. Series MP400 Primary Resistance Start: There are two contactors supplied along with a set of starting resistors. The starting
contactor is connected in series with the resistors to reduce the voltage to the motor for a preset time. After this preset time delay
(See Screen #314) the main contactor will close in parallel with the starting contactor and resistors and thus apply full voltage to
the motor. If the motor is not connected for this test, there will be no voltage drop across the resistors and full voltage will appear
at the output terminals of the contactors as soon as the starting contactor closes.