11
Before the ignition the “System of Motor Protection from Overload” has to be calibrated
setting the Current Protection on the internal regulator of the Board.
The Protection Delay is set at a fix time of 4 seconds.
During the calibration close the JUMPER “E.T.TA“ to disable the delay protection;
The Regulator of Current Protection depends of the value of calibration set on the
board
;
Trimmer “CORRENTE MOTORE”
NOTE : When the setting is complete, reset the protection tripping current delay time
by removing the “ESCL.TIM.TA” JUMPER;
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 E.T.TA
JUMPER;
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
ESCL.TIM.TA
JUMPER; (
the delay
is used to allow for the initial inrush currents)
;
8a. REGULATION AND CALIBRATION
EXAMPLE OF CALIBRATION OF MOTORS
- Current protection regulator
Set the current protection of the motor at
a value superior of about 10-20% of the
nominal current.
Example: for a motor with nominal
electrical input of 10A set it at about 12A
22A
2A
19A
3A
12A
6A
5A
15A
9A
8b. REGULATION AND CALIBRATION
