Lenze EMB9352−C - Manual (Page 110)

Commissioning 8
l
110 EDBMB935X DE/EN/FR 13.0
8 Commissioning
(
Stop!
Before initial switch−on, check
ƒ whether the terminals +U
G
and −U
G
are connected correctly.
– If +U
G
and −U
G
are inverted, braking units and all components
connected can be destroyed.
ƒ the switching thresholds of the braking unit(s) are set to the same
values for the entire drive system via switches S1 and S2
– Setting the switching thresholds: see chapter 7.6.
ƒ the braking units are configured correctly via S3 if braking units
are connected in parallel.
– The 1. braking unit as master (S3 = OFF).
– All further braking units as slaves (S3 = ON).
Operating status display
The two LEDs on the braking unit display the operating status:
LED display Operating status
Green Yellow
Off Off Braking unit without voltage, not ready for operation.
On Off Braking unit is supplied with voltage and is ready for operation.
On On Braking unit in braking operation, energy is converted within the brake
resistor.
If the braking power is small, the braking times are short, or, during operation
with a switching threshold of 375 V, the luminosity of the yellow LED is very
low.
Operating notes
)
Note!
The total braking time of a drive is increased if the power that is
regenerated is greater than the peak braking power of the brake
resistor assigned.
In this case the controller sets pulse inhibit and reports
"overvoltage". Remedy to ensure continuous deceleration with a
steady braking torque:
ƒ Increase deceleration time T
if
or the QSP ramp at the controller, or
ƒ If permissible, use a low−resistance brake resistor.