METRON MP430 Series Manual Download Page 13

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Series MP420 Part-Winding Start:

There are two contactors for part-winding start. The start contactor will close immediately

on demand and the other will close after a preset transition time delay (See Screen #314). Full voltage will be present at the output
of both contactors.

Series MP430 Wye-Delta Open Transition:

There are three contactors for wye-delta starting. The start contactor and the

shorting contactor will close immediately on demand. This connects the motor leads in the wye configuration. After the transition
time delay the shorting contactor opens and the run contactor closes, thus connecting the motor windings in the delta
configuration. The motor will now run at full speed and deliver rated horsepower to the load.

Series MP435 Wye-Delta Closed Transition:

The operation of the Series MP435 is almost the same as the Series MP430.

There is an additional resistor contactor and a set of transition resistors which provides power to the motor windings during
transition from the wye connection to the delta connection. After the transition time delay this contactor closes, which connects
the resistors to the motor windings. After the resistor contactor closes the shorting contactor opens, which in turn allows the run
contactor to close, thus connecting the motor windings in the delta configuration. The motor will now run at full speed and deliver
rated horsepower to the load.

Series MP450 Autotransformer Start:

There are three contactors for autotransformer starting. The start (autotransformer)

contactor and the autotransformer neutral contactor will close immediately on demand. This connects the motor leads through the
autotransformer to reduce the voltage to the motor. After the transition time delay the run contactor closes and then the start
contactor and autotransformer neutral contactor open, thus connecting the motor to full voltage. The motor will now run at full
speed and deliver rated horsepower to the load.

Series MP700 Solid State Soft Start:

There are two contactors for solid state soft starting. The solid state starter line contactor

will close immediately on demand and ramp the motor up to speed depending on the solid state starter configuration parameters.
After the transition time delay the run contactor closes and bypasses the solid state starter, thus connecting the motor to full
voltage. The motor will now run at full speed and deliver rated horsepower to the load. When the stop command is received and
the controller is set up for the ramp stop option (Screen #106) the motor will ramp down in speed over a fixed time delay (Screen
#107) until it stops.

Note: When using the emergency manual start handle, the soft start unit may display an “OCF” fault condition. This is
normal. The unit is not malfunctioning. When the proper stop sequence is used according to paragraph E above, the fault
condition will be cleared and the soft start unit will be ready for a normal start.

PART IV: INSTALLATION AND TEST PROCEDURE

INSTALLATION

The Fire Pump Controller has been assembled and wired at the factory in accordance with the highest workmanship standards.
All circuits and functions have been thoroughly tested to assure correct operation when properly installed. The installer should
be completely familiar with the external hookup of the pump junction box to the terminal bar in the Controller. All local electric
codes should be used for proper installation, wiring and grounding of the controller prior to startup.

A weekly test drain solenoid valve may be provided to relieve water pressure to the pressure transducer thus initiating the start
sequence. This test simulates an actual start demand. Since the Controller operates the drain valve only momentarily, a small
amount of water is drained off. The water pressure sensing line to the Controller from the pump must be thoroughly flushed
before connection to the Controller in order to remove chips, particles, or other matter, that could enter the plumbing
components in the Controller.

Controllers configured with

"Automatic Stop"

enabled may be changed to

"Manual"

stop by disabling this feature in System

Config Screen 104. If deluge valve switches are to be used for starting, enable the Deluge Valve Option in Config Screen 121
and connect the remote normally closed switch to terminals 74 and 111.

TEST PROCEDURE

All of the following tests should be made on each unit after installation. If each test is satisfactory, the operator may place the
control switch in

"Auto"

mode and depend upon the panel operating properly when required. Also, any one or all of these tests

may be carried out at any time after installation, if so desired.

NOTE: If the Supervisory Power Failure Start Option has

been Enabled (Screen #116) and 115 Volts A.C. is not connected to Controller, the "System Fault" light will illuminate
and the controller will start automatically after a time delay. The 115VAC must be turned on to prevent the pump from
starting.

Phase Reversal Alarm –

Upon initial power up, if a phase reversal alarm should sound, the following process can be used to

correct the alarm. If a test of the motor rotation indicates that the motor is turning opposite of the correct direction, the motor