13
EXAMPLE OF CURRENT PROTECTION FOR A THREE PHASE MOTOR:
Suppose that we want to set the Protection from Overload for a three phase motor of
5,5kW (7,5Hp) with a Nominal Supply Current of about 12 A.
CALIBRATION STEPS:
Override the current protection cut-in delay time by CONNECTING the ESC.TIM.TA
JUMPER, after motor start;
Set the maximum value with the internal regulator on the “Protection tripping
current” panel (turn clockwise)
Turn the motor on and, with the “Protection tripping current” regulator, reduce
until the red “Motor Protection” LED comes on and the motor stops; (THIS SHOULD
CORRESPOND APPROXIMATELY TO THE RATED CURRENT… 12A);
Increase the “Protection tripping current” adjustment by approximately 10-20% of
the previously set value. (AT APPROX. 15a)
Reset the Protection Cut-in Delay by REMOVING the ESC.TIM.TA JUMPER; (the
delay is used to allow for the initial inrush currents);
At this point the protection is set and the control panel can be set for the desired
type of operation: EMPTYING – FILLING.
The Motor overload cut-out can be overridden by SETTING the internal DIP-SWITCH 4
TO OFF POSITION (
AMP. PROTECTION CUT-OUT OVERRIDEN):
In this way the protection cut-in will be signalled by the “Motor protection enabled”
light, but the motor will not be blocked.
WARNING
The MOTOR can be switched off in the following ways:
- In “manual”, the motor stops when the “MANUAL” button is released;
- In “automatic”, the motor stops when the G1 switch is no longer enabled or
when the level sensors, if used, give a max./min. level alarm based on how
the dip-switches 1 and 2 has been set or by pushing the “0 – RESET”
button;
- Turning the general switch with door interlock to “0”.
9b. REGULATION AND CALIBRATION
10. STOP OF THE PUMP
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