Lenze EMB9352−C - Manual (Page 95)

Electrical installation
Important notes
Protection of persons
7
l
95 EDBMB935X DE/EN/FR 13.0
7 Electrical installation
7.1 Important notes
(
Stop!
The braking unit includes electrostatic sensitive devices.
When working near the terminals, the personnel must be free of
electrostatic charges.
7.1.1 Protection of persons
{
Danger!
Before carrying out operations on the braking unit, check whether
all power terminals are in a deenergised state:
ƒ After power−off the power terminals +U
G
, −U
G
and RB1, RB2 still
carry dangerous voltages for 3 minutes.
ƒ S1, S2 and S3 have a mains potential!
– Wait for at least 3 minutes before changing over the switches.
ƒ During braking operation the DC−bus voltage is still applied after
power−off:
– In order to avoid that energy is fed into the DC bus further on,
controller inhibit has to be set for all controllers in the
interconnection.
– Observe that the drive system coasts down after controller
inhibit has been set.
Replacing defective fuses
Replace defective fuses only in the deenergised state with the type specified.
7.1.2 Device protection
ƒ Before commissioning, adapt the switching threshold of the braking
unit(s) to the mains voltage of the controller. (
¶ 104)