Parker Hannifin S.p.A. - Divisione S.B.C. “SPD” User’s Manual
25
4.5 External braking resistance
The drive has an internal braking resistance. When a higher braking power is needed, it is
possible to connect an external braking resistance to the drive.
The external braking resistance value must be 27 Ohm (
REF2
) for SPD25, while must be 40
Ohm (
REF1
) for the other version, and it is necessary to place a magneto-thermal switch (or a
fuse) between the external braking resistance and the drive.
The minimum cross section of the conductors depends on the drive size and it is equal to the
minimum cross section of the conductors between motor and drive (see paragraph “Power
connections”). It is necessary to minimize the connection cable length. In any case the cable
length must be less than 3 m.
The connection of the external braking resistance is shown in the following pictures. The
bridge between IR and CB terminals (see pictures) enables the internal braking resistance;
when the external braking resistance is connected, the IR-CB bridge must be removed.
Connect the external resistance to the pins: +B and CB.
Resistenza Esterna
Resistenza Esterna
Morsettiera X4 per SPD 2, 5 e 8
Morsettiera X4 per SPD 16 e 25
Resistenza Interna
Resistenza Interna
R
R
Resistance value: RFE1= 40
Ω
; RFE2= 27
Ω
It’s possible see the appendix: “external braking modul”.
Terminal power X4 for SPD 16 and 25
Internal resistance
External resistance
Terminal power for SPD 2, 5 and 8
Internal resistance
External resistance