Tornatech GFX, Руководство по установке и обслуживанию, Страница: 6 / 46

6
The power source does not « see » any open circuit during the transition from wye to delta. During the
transition from Wye to Delta, a resistor bank is connected in the starting circuit and allows to keep the motor
coils energized. An 80 second delay is then triggered and prevent the motor from stoping. This delay allows
the resistors to cool down and will only be triggered if the transition occur. An emergency stop can still be
perform by pulling the disconnecting mean handle.
MODEL GFY: WYE-DELTA OPEN TRANSITION STARTER
This type of starter requires a multi-connection motor and 6 conductors between the controller and the
motor.
Upon a start command, the motor is connected to the line in the Wye connection. After a time delay, the
motor is reconnected to the line in the Delta configuration applying full voltage to the motor windings. This
controller is of the open transition type. The motor is disconnected from the line during the transition from
start (wye) to run (delta) mode.
Methods of Starting/Stopping
The controllers are available as combination automatic / non-automatic with provision for manual or automatic
shutdown (an automatic shutdown is only possible after an automatic start).
METHODS OF STARTING
AUTOMATIC START
The controller will start automatically on low pressure detection by the pressure sensor when the pressure drops
below the cut-in threshold.
MANUAL START
The motor can be started by pressing the START push button, regardless of the system pressure.
REMOTE MANUAL START
The motor can be started from a remote location by momentarily closing a contact of a manual push button.
REMOTE AUTOMATIC START, DELUGE VALVE START
The motor can be started from a remote location by momentarily opening a contact connected to an automatic
device.
EMERGENCY START
The motor can be started manually by using the emergency handle. This handle can be maintained in a closed
position.
Important: to avoid damaging the contactor, it is recommended to start the motor in this manner:
1) Shutdown the main power by using the main disconnect means,
2) Pull the emergency handle and lock it in closed position,
3) Turn the power back on by using the main disconnect means.
SEQUENTIAL START
In case of a multiple pump application, it may be necessary to delay the automatic (pressure drop) starting of each
motor to prevent simultaneous starting of all motors.
TEST START
The motor can be started manually by pressing the run test button.
METHODS OF STOPPING
MANUAL STOP
Manual stop is done by pressing the priority STOP push button. Note that pressing the stop push button will
prevent the motor from restarting as long as the button is pressed, plus a two second delay.