Calibration Of The Thermal Relay - Riello RS 50/M MZ Manuel D'entretien

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.
2
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
1
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
Fig. 21
D8267
delta and change the calibration of the thermal relay as well.
Voltage 3 ~ 380/460/480V - 60Hz
• If the motor is star-driven, 380/460/480V, the cursor must be positioned on "MIN".
• Even if the scale of the thermal relay does not include rated motor absorption at 380/460/480V, protection is still ensured in any case.
NOTE
The burners leave the factory preset for 380/460/480V power supply.
6463
17
GB