70
MSD Multi-Axis System Operation Manual DC-AC Servo Drive
Motor protection switch
•
G392-004 (Size 1) to G392-072/G395-084 (Size 5)
In all circumstances the motor protection switch is to be installed in addition to
the mains fuses. It provides overload protection for the device, mains choke and
mains filter in the range up to the permissible overload range. The rated cur ent
of the motor protection switch ("circuit breaker for system and motor protection"
of CLASS 10, SIEMENS pr
oduct range SIRIUS 3RV10 or SIRIUS 3RV20) is to
be selected to suit the lowest rated current I
Rated (f_sw and U_Mains)
of the components
used (mains choke, mains filte , AC-AC Servo Drive).
•
G392-090/G395-110 (Size 6) to G395-450 (Size 7)
The motor protection switch is not required if semiconductor fuses of utilisation
class gRL (gS) ar
e used instead of mains fuses of utilisation class gG
•
Braking resistor
The AC-AC Servo Drive's braking resistor is to be dimensioned such that the
total regenerative power from the multi-axis system can be dissipated. On
dimensioning the connection cables for the braking resistor, it is to be noted
that if there is a fault the mains side protection devices will trigger safely. It is to
be taken into account that the ratio of currents is I
DC bus ef
f
/ I
Mains side ef
f
= √(3/2).
moog
Id. no.: CA97554-001 0
5
/2017
8 Operation with AC-AC Servo Drive as supply
