YASKAWA SI-T/ V7, Technical Manual

Page: 79 / 157

5-27
Continued
FWD RUN
(S6) UP
COMMAND
(S7) DOWN
COMMAND
UPPER
LIMIT SPEED
LOWER
LIMIT SPEED
OUTPUT
FREQUENCY*
"SPEED AT SET
FREQUENCY"
SIGNAL
* U = UP (Accel) status; D = DOWN (Decel) status; H = HOLD (constant speed) status;
U1 = At Upper Limit Speed; D1 = At Lower Limit Speed
Up/Down Frequency Setting Timing
D1 D D D H H H H H H H U1 U U
U
D1 D1
5.18 MULTI-FUNCTION INPUT TERMINALS (Term. S1-S7)
G. Data 16 : Accel/Decel Hold
By programming data " 16 " into one of the multifunction input parameters ( n050 thru n057 ), one
of the multi-function input terminals (S1 thru S7) becomes a HOLD command input. As long as the
HOLD command is present, accel and decel are in a prohibit state, and the output speed is held at
the level it was at the time the HOLD command was input. When the HOLD command is removed
while the system is still in Run condition, accel or decel will again become active to allow output to
reach set speed. If Stop is initiated while the HOLD command is present, the prohibit state is can-
celled and the system enters stop operation.
HOLD Function Timing
FWD RUN
HOLD CMD
SPEED REF.
OUTPUT SPEED