YASKAWA Varispeed-616GII Instruction Manual page 37

(4) Override function
Open : The operation ig made by the master speed frequency command
(override cut) .
Close : Override is carried out as shown in Fig . 11 . The overrride gain is
given by an auxiliary frequency command (0 to +10 V/0 to 200%) .
MASTER FREQUENCY COMMAND
A/D
A/D
(5)
Inching function
REVERSE RUN COMMAND
INCHING COMMAND
200%
100%
FORWARD RUN COMMAN D
5V 10V
Fig . 11
Block Diagram of Override
Close : Only during close, the inching operation with control constant 26
(Setting to 6 Hz prior to shipment from the factory) as the frequency
command is carried out . The rotating direction is given by the
forward run command or reverse run command . The timing chart in
forward and reverse operations are shown in Fig . 12 .
CLOSED
OPEN
CLOSED
INCHING FREQUENCY(26)
LIMITTER 110%
D C INJECTION BRAKING TIME AT START (12)
r C INJECTION BRAKING TIME AT STOP (11
Fig . 12 Time chart at Forward and Inching Operations
FREQUENCY COMMAND
Note : Parenthesized values indicate the number of control constant .