Riello 2916463 Manuel D'entretien page 19

Installation
4
4.9 Calibration of the thermal relay
The thermal relay serves to avoid damage to the motor due to an exces-
sive absorption increase or if a phase is missing.
The protection is in any case ensured even if the minimum value of the
thermal relay scale is over the rating absorption of the motor.
This occurs when the motor power supply is 400V.
To reset, in case of an intervention of the thermal relay, press button 1)
of Fig. 21.
Voltage 3 ~ 400 / 230V - 50Hz
• If the motor is star-driven, 400V, the cursor must be positioned on "MIN".
• If it is delta-driven, 230V, the cursor is positioned on "MAX".
Even if the scale of the thermal relay does not include rated motor absorp-
tion at 400V, protection is still ensured in any case.
NOTE
The RS 50/M MZ models leave the factory preset for 400V power supply.
If 230V power supply is used, change the motor connection from star to
delta and change the calibration of the thermal relay as well.
Voltage 3 ~ 460 / 230V - 60Hz
• If the motor is star-driven, 380-460V, the cursor must be positioned on "MIN".
• If it is delta-driven, 208-230V, the cursor is positioned on "MAX".
Even if the scale of the thermal relay does not include rated motor absorption at 380 -460V, protection is still ensured in any case.
NOTE
The RS 50/M MZ models leave the factory preset for 380-460V power supply.
If 208 -230V power supply is used, change the motor connection
mal relay as well.
2
from star to double star
17
GB
1
D8267
and change the calibration of the ther-
Fig. 21
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