JETI model Central Box, User Manual

Page: 15 / 42

EN
3.3 Overload protection of servos
(Central Box 100/220)
The Central Box 100 and Central Box 220 has an overload protection
circuit on every servo output. In case of an overload, the affected
servo output is disconnected from the power supply while the
remaining servo outputs are still powered.
The Central Box 220 has 4 outputs for high-torque servos and 11
outputs for standard servos. Servo outputs for high-torque servos
use resettable fuses with the hold current 6A and trip current 12A
(20°C). The other servo outputs use resettable fuses with the hold
current 2.6A and trip current 5A (20°C).
The hold current means the maximum current which will pass
without tripping in 20°C.
The trip current means the minimum current at which the fuse will
trip in 20°C.
Be aware of the performance of the fuse is strongly temperature-
dependent. If the ambient temperature is high (more than 50°C) we
recommend using the Central Box 210. The same recommendation
applies for the mechanical connection of the several servos.
Central Box 220 generates an alarm if the temperature after the
start is higher than 50°C. It is not recommended to operates with
Central Box 220 while the initialization temperature is higher than
50°C. Otherwise, the performance of the fuses is degraded.
Fig. 8 : Correct connection of servos to the Central Box
SERVO
SERVO
SERVO
N o
SERVO
N o
SERVO
Yes
14 EN