Danfoss VLT FC 100 Series Programming Manual page 52

3. Parameter Description
2-13 Brake Power Monitoring
Option:
* Off
[0]
[1] Warning
3
[2] Trip
[3] Warning and Trip
If power monitoring is set to
overload of the resistor. It is also possible to generate a warning via a relay/digital outputs. The measuring accuracy of the power monitoring depends
on the accuracy of the resistance of the resistor (better than ± 20%).
2-15 Brake Check
Option:
* Off
[0]
[1] Warning
[2] Trip
[3] Stop and Trip
NB!
NB!: Remove a warning arising in connection with
Off
For
2-17 Over-voltage Control
Option:
[0] Disabled
* Enabled
[2]
52
Function:
This parameter is only active in frequency converters with an integral dynamic brake.
This parameter enables monitoring of the power to the brake resistor. The power is calculated on the basis of
the resistance (par. 2-11
No brake power monitoring is required.
Activates a warning on the display when the power transmitted over 120 s exceeds 100% of the monitoring
Brake Power Limit (kW)
limit (par. 2-12
The warning disappears when the transmitted power falls below 80% of the monitoring limit.
Trips the frequency converter and displays an alarm when the calculated power exceeds 100% of the monitoring
limit.
Activates both of the above, including warning, trip and alarm.
Off [0] or Warning [1], the brake function remains active, even if the monitoring limit is exceeded. This may lead to thermal
Function:
Select type of test and monitoring function to check the connection 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. 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.
Monitors brake resistor and brake IGBT for a short-circuit during operation. If a short-circuit occurs, a warning
appears.
Monitors brake resistor and brake IGBT for a short-circuit, and to run a test for brake resistor disconnection
during power-up
Monitors for a short-circuit or disconnection of the brake resistor, or a short-circuit of the brake IGBT. If a fault
occurs the frequency converter cuts out while displaying an alarm (trip locked).
Monitors for a short-circuit or disconnection of the brake resistor, or a short-circuit of the brake IGBT. If a fault
occurs the frequency converter ramps down to coast and then trips. A trip lock alarm is displayed.
Warning
[0] or [1], the frequency converter keeps running even if a fault is located.
Function:
Over-voltage control (OVC) reduces the risk of the frequency converter tripping due to an over voltage on the
DC link caused by generative power from the load.
No OVC required.
Activates OVC.
MG.11.C5.02 - VLT
VLT
Brake Resistor
(Ohm)), the DC link voltage, and the resistor duty time.
).
Off Warning
[0] or [1] by cycling the mains supply. The fault must be corrected first.
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HVAC Drive Programming Guide