Toshiba TOSVERT VF-MB1 Instruction Manual page 174

Ex.) When using the RY-RC terminal as the brake signal output terminal
Title
f130
Learning function [f348]
Using this function, rough settings can be made automatically and also parameters f345, f346 and f347
can be set automatically.
After the learning function is set, f342 will be set automatically to 4 and f343 to 100 . If necessary, fine
adjust the parameter setting manually.
[Learning operation]
Set parameter f348 to 1 and enter an operation command to start learning. (The frequency and " tun " are
displayed alternately.)
Parameter f343 (torque) is set, the brake release timing is calculated, and parameter f345 (release time) is
set based on the calculation result. f346 is set automatically according to the motor constant calculated. At the
stop of operation, f347 (creep time) are set.
Note 2: Learning should be performed under light-load conditions.
Note 3: If a counterweight is provided, a learning error may occur. If so, make an adjustment manually.
Note 4: Brake learning ( f348=1 ) should be carried out for normal rotation if f341 is set to 1 (forward
6
winding), or for reverse rotation if f341 is set to 2 (reverse winding).
[Notabilia for braking function]
Note 5: For the braking functions, the pre-excitation time is automatically determined by the inverter from motor-
related constants.
When the VFMB1S-2022PL is used in combination with a Toshiba 4P-2.2kW-60Hz-200V standard motor,
the pre-excitation time is approximately 0.1 to 0.2 seconds.
Depending on the motor used, the pre-excitation time may be prolonged.
Note 6: When using braking functions, set parameter au2 (automatic torque boost) to 2 (vector control + auto-
tuning) or set motor-related parameters f401 to f413.
Note 7: When the inverter is confirmed operation by braking functions, connect and run the combinated motor.
As this function calculate the timing of brake by detecting output current, calculating error is occurred
without connecting the motor.
Torque bias function
Using this function, the load can be started smoothly,
by the motor produces enough torque for load portion
before the brake is released,
[Selection of external signals]
Voltage signals
Current signals
Function
Output terminal function selection 1A (RY-RC)
VIA-CC – 0~10V (0~250%)
VIB-CC – 0~±10V (-250~250%)
VIC-CC – 4(0)~20mA (0~250%) 
Adjustment range
0-255
Tension torque bias
as additional torque

1
Additional torque
2
(fixed direction)
F-54
E6581697
Example of setting
68 (Brake release)
Reverse run
Forward run