Start Signal Operation Selection - Mitsubishi Electric 800 Series Instruction Manual

12.9

Start signal operation selection

Operation of the start signal (STF/STR) can be selected.
Select the stopping method (deceleration stop or coasting) at turn-OFF of the start signal.
Use this function to stop a motor with a mechanical brake at turn-OFF of the start signal.
Pr. Name Initial value
250
Stop selection 9999
G106
 2-wire type (STF signal, STR signal)
• The following figure shows the 2-wire type connection.
• As an initial setting, the forward/reverse rotation signals (STF/STR) acts as both start and stop signals. Either one turned
ON will be enabled, and the operation will follow that signal. The motor will decelerate to a stop when both are turned OFF
(or both are turned ON) during the operation.
• The frequency can be set by inputting 0 to 10 VDC between the speed setting input terminals 2 and 5, or with Pr.4 to Pr.6
Multi-speed setting (high speed, middle speed, and low speed). (For the multi-speed operation, refer to
• By setting Pr.250 = "1000 to 1100, 8888", the STF signal input becomes the start command and the STR signal input
becomes the forward/reverse command.
Forward
STF
rotation start
STR
Reverse
rotation start SD
10
2
5
ON
STF
STR
2-wire type connection example (Pr.250 = "9999")
NOTE
• By setting Pr.250 = "0 to 100, 1000 to 1100", the motor will coast to a stop when the start command is turned OFF. (Refer to
page 384.)
• The STF and STR signals are assigned to Pr.178 STF/DI0 terminal function selection and Pr.179 STR/DI1 terminal
function selection in the initial status. The STF signal can be assigned to only Pr.178 STF/DI0 terminal function selection,
and the STR signal can be assigned to only Pr.179 STR/DI1 terminal function selection.
Setting range
STF signal: Forward rotation start
0 to 100 s
STR signal: Reverse rotation start
STF signal: Start signal
1000 to 1100 s STR signal: Forward/reverse
rotation signal
STF signal: Forward rotation start
9999
STR signal: Reverse rotation start
STF signal: Start signal
8888 STR signal: Forward/reverse
rotation signal
Inverter
Time
ON
Description
Start signal (STF/STR)
The motor coasts to a stop after a lapse
of the setting time when the start signal
is turned OFF.
When set to 1000 to 1100 s, the motor
will coast to stop after the time period
calculated by subtracting 1000 s from
the time set in Pr.250.
The motor is decelerated to a stop
when the start signal is turned OFF.
STF
Start signal
STR
Forward/
reverse
SD
signal
10
2
5
ON
STF
STR
2-wire type connection example (Pr.250 = "8888")
12. (T) Multi-Function Input Terminal Parameters
Stop operation
(Refer to page 384.)
page 195.)
Inverter
Time
ON
12.9 Start signal operation selection
11
12
13
14
15
16
17
18
19
20
291