Dc Link Threshold Selection; Section 6 R Brake Option Installation - Siemens COMBIMASTER Operating Instructions Manual

6 R BRAKE OPTION INSTALLATION (Continued)
The unit is now ready to be fitted to the inverter.
WARNING
Under no circumstances attempt to fit or remove the braking unit while the
inverter is still powered.
• Ensure that the inverter is isolated from
the mains supply. Remove and discard
the inverter case cover.
• Remove and discard the internal black
plastic insulation cover, but retain the two
securing screws.
• Locate studs ST100 (L1) and ST102
(L3), on the now exposed gate drive
PCB. Replace the two nuts, which each
secure a flying lead to its stud, with two
of the metal sockets (part B1) provided.
Secure the flying leads via the sockets
using a 6mm flat-blade screwdriver and
torque-down to 0.8Nm.
Note that these studs are not electrically
part of the R brake option, but provide for
greater ease in fitting of the option.
• Locate studs ST500 and ST501 (E-M
brake relay control). Fit two more metal
sockets (part B1) to these studs and
secure and torque-down as in the
previous step.
Note that these studs are not electrically
part of the R brake option, but provide for
greater ease in fitting of the option.
• Locate studs ST103 (DC+) and ST104
(DC-). Fit the last two metal sockets
(part B1) to these studs and secure and
torque-down as in the previous step.
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DC LINK THRESHOLD SELECTION

WARNING
Selecting a 750V threshold for
supply voltages greater than
500VAC will damage the
braking resistor.
The DC link threshold defines the point at
which braking pulses are generated and
depends on the mains voltage.
© Siemens plc 2000 ¦ G85139-H1731-U450-B1
• Fit the gate drive PCB insulation (part
B2) supplied with the option. Secure
with the retained securing screws and
torque-down to 2Nm.
CAUTION
Ensure that gate drive PCB
insulation is in place before fitting
the brake option inverter cover.
• Ensure the cover gasket is correctly
positioned.
• Making sure the arrows on the labels
fitted to the outside of the R brake option
are pointing towards the motor shaft,
gently align the 4mm nickel plated plugs
on the brake option circuit board with the
newly fitted sockets in the inverter and
push down. The brake option will only fit
one way round. Do not use excessive
force. The unit may be damaged if
plugs/sockets are not properly aligned.
• Check the four corners of the cover are
making contact with the inverter case to
ensure that the brake option is correctly
earthed.
• The R Brake Option does not require any
inverter parameter changes, and once
installed, is ready for use.
Supply Voltages < 500VAC
X201 = open and X301 = closed
(threshold = 750VDC).
Supply Voltages > 500VAC
X201 = closed and X301 = open
(threshold = 800VDC).
Locate X201 & X301 in Fig. 4.
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