Danfoss FC 300

2-15 Brake Check
Option: Function:
Select type of test and monitoring function to check the con-
nection to the brake resistor, or whether a brake resistor is
present, and then display a warning or an alarm in the event of
a fault.
NB!
The brake resistor disconnection function is tested
during power-up. However the brake IGBT test is
performed when there is no braking. A warning or
trip disconnects the brake function.
The testing sequence is as follows:
1. The DC link ripple amplitude is measured for 300 ms
without braking.
2. The DC link ripple amplitude is measured for 300 ms
with the brake turned on.
3. If the DC link ripple amplitude while braking is lower
than the DC link ripple amplitude before braking + 1
%:
Brake check failed, return a warning or alarm.
4. If the DC link ripple amplitude while braking is higher
than the DC link ripple amplitude before braking + 1
%:
Brake check OK.
[0] *
Off Monitors brake resistor and brake IGBT for a short-circuit during
operation. If a short-circuit occurs, a warning appears.
[1] Warning Monitors brake resistor and brake IGBT for a short-circuit, and
runs a test for brake resistor disconnection during power-up.
[2] Trip Monitors for a short-circuit or disconnection of the brake resis-
tor, or a short-circuit of the brake IGBT. If a fault occurs, the
drive cuts out while displaying an alarm (trip locked).
[3] Stop and Trip Monitors for a short-circuit or disconnection of the brake resis-
tor, or a short-circuit of the brake IGBT. If a fault occurs, the
drive ramps down to coast and then trips. A trip lock alarm is
displayed.
[4] AC brake Monitors for a short-circuit or disconnection of the brake resis-
tor, or a short-circuit of the brake IGBT. If a fault occurs, the
drive performs a controlled ramp down. This option is available
for FC 302 only.
NB!
NB!: Remove a warning arising in connection with
Off [0] or Warning [1] by cycling
the mains supply. The fault must be corrected first. For
Off [0] or Warning [1], the
drive keeps running even if a fault is located.
This parameter is only active in drives with an integral dynamic brake.
2. How to Programme FC 300 Programming Guide
66 MG.33.M2.02 - VLT
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is a registered Danfoss trademark
2