Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual page 49

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VLT AutomationDrive FC 300 Operating
Instructions
2-15 Brake Check
Option:
[0] * Off
[1] Warning
[2] Trip
[3] Stop and trip
[4] AC brake
NB!
NB!: Remove a warning arising in connection with
For Off [0] or Warning
This parameter is only active in frequency converters with an integral dynamic brake.
4.3.1 2-2* Mechanical Brake
Parameters for controlling operation of an electro-magnetic (mechanical) brake, typically required in hoisting applications.
To control a mechanical brake, a relay output (relay 01 or relay 02) or a programmed digital output (terminal 27 or 29) is required. Normally this output
must be closed during periods when the frequency converter is unable to 'hold' the motor, e.g. due to an excessive load. Select
Control [32] for applications with an electro-magnetic brake in par. 5-40
Digital Output . When selecting Mechanical brake control
Release Brake Current
selected in par. 2-20
Activate Brake Speed [RPM]
2-21 . If the frequency converter enters an alarm condition or an over-current or over-voltage situation, the mechanical brake
immediately cuts in. This is also the case during safe stop.
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.
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 discon-
nects 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 %:
4. If the DC link ripple amplitude while braking is higher than the DC link ripple amplitude
before braking + 1 %:
Monitors brake resistor and brake IGBT for a short-circuit during operation. If a short-circuit occurs,
warning 25 appears.
Monitors brake resistor and brake IGBT for a short-circuit, and runs a test for brake resistor dis-
connection 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 (e.g. warning 25, 27 or 28).
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 performs a controlled ramp down. This option is
available for FC 302 only.
Off
[0] or
[1], the frequency converter keeps running even if a fault is located.
Function Relay
[32], the mechanical brake is closed from start up until the output current is above the level
. During stop, the mechanical brake activates when the speed falls below the level specified in par.
MG.33.AC.02 - VLT is a registered Danfoss trademark
Brake check has failed by returning a warning or alarm.
Brake check is OK.
Warning
[1] by cycling the mains supply. The fault must be corrected first.
, par. 5-30 Terminal 27 Digital Output
4 How to Programme
4
Mechanical Brake
, or par. 5-31 Terminal 29
49