User`s manual

220 • Vacon apfiff09 marine
Tel. +358
6
Brake
Off lim
Speed
Ref
1 65432
1. Start command
2. Start magnetization is used to build rotor flux fast. The drive Zero speed time is used during
this.
3. When the rotor flux is > 90 % and the start zero time has expired the speed reference is
released to BrakeOpenFreq limit.
4. Speed is kept at this speed until feedback is received from the brake acknowledge or when
brake mechanical delay time has passed.
5. Speed follows normal reference signal.
Speed reference release function:
FinalFrequencyReference
LIMIT
MN
IN
MX
FrequencyReference
SEL
G
IN 0
IN 1
SEL
G
IN 0
IN 1
DELAY
TON OUT
TOFF
IN
RESET
ET
P Brake Mech Delay
0
SR
SET
RESET
AND
IN 1
IN 2
SEL
G
IN 0
IN 1
Brake Feedback Active
TRUE
Ext. Brake ACK
Running
NOT
IN
P Neg Freq Limit
P
Pos Freq Limit
SEL
G
IN 0
IN 1
CL Control
P BrakeOffFrqLimOL
P BrakeOffFrqLimCL
NEG
IN
PreBrakeOpenCommand
P2.15.1 Mechanical brake reaction time ID1544
After the brake open command has been given, speed is kept at the Brake Open limit
until the reaction time has passed. This hold time should be set corresponding to the
mechanical brake reaction time. This function is used to avoid current and/or torque
spikes eliminating a situation where the motor is run at full speed against the brake. If
this parameter is used when simultaneously with the brake acknowledge input both time
and brake acknowledgements are needed before the speed reference is released.
P2.15.2 Brake Frequency limit Open Loop ID1535
This parameter defines the frequency limit to release the brake.
This value also applies as the maximum frequency reference limit while the brake is
closed. In open loop control it is recommended to use a value that is equal to the motor
nominal slip.