Elettronica Santerno SINUS K, User Manual

Page: 133 / 191

SINUS K
INSTALLATION
INSTRUCTIONS
133/ 191
WIRE CROSS-SECTIONS
Use 25 sqmm wires for power connection wirings and 0.5 or 1sqmm wires for signal wiring.
When connecting the conductor to the braking resistor, consider that the latter can reach a temperature of 200
°C.
RESISTORS THAT CAN BE CONNECTED TO THE BRAKING UNIT
The min. rating of the resistor to be connected to the braking unit depends on the inverter rated voltage
(Ratings). The max. braking time (Ton) is limited from the max. allowable temperature and from the allowable
dissipated power. As a result, the Duty-cycle
δ parameter is defined based on the braking resistor rating and
time Ton (braking time) and is expressed as the ratio between time Ton and the entire duty-cycle (Ton+Toff).
Duty-cycle represents a whole braking cycle.
Figure 61shows the max. allowable duty-cycle (depending on Ton) for the connected braking resistor.
Figure 61: Max. allowable duty-cycle (depending on Ton) for the connected braking resistor.