Siemens SIMOVERT MASTERDRIVES Betriebsanleitung Seite 56

Mounting, Connecting-Up
WARNING
3-2
♦ Braking unit:
Connect the terminals C/L+ and D/L- (top side of the braking unit) or
the busbars to the terminals C/L+ and D/L- of the drive (see Fig.
3-3).
Create the protective connection between the converter and the
braking unit (For cross-section of the protective connection see
Table 3-1).
• Connecting cables to DC link must be twisted-pair and max. 3 m
long
• In the case of several parallel inverters with a common DC link,
the braking unit must be connected to the inverter with the
highest output.
♦ Connecting braking units in parallel:
• To increase the braking power, braking units can be connected
in parallel. The switch for the response threshold (see Fig. 6-2,
Fig. 6-3) must be set identically on all units connected in parallel.
The total continuous braking power PDB is calculated from the
total continuous braking power of the individual units. For a
definition of braking power, see Fig. 4-1.
• Each braking unit must have its own twisted-pair feeder cable,
max. 3 m in length, to the DC link. Feeder cables of the same
length must be used for all paralleled braking units to ensure a
symmetrical distribution of current.
• Each braking unit requires its own braking resistor
♦ External braking resistors (selection list see chapter "Braking
Resistors")
• Connect braking resistor to terminals G and H.
• Length of the connecting cables between braking unit and
external braking resistor < 15 m.
Mis-connecting or shorting the DC bus terminals will destroy the drive
and the braking unit, respectively.
The exit air from the braking units can reach a temperature of > 80 °C.
The housing surface can reach a temperature of > 65 °C.
6SE7087-6CX87-2DA1
Braking Unit SIMOVERT MASTERDRIVES
05.2009
Siemens AG