Mitsubishi Electric FR-A800 Series Instruction Manual page 724

NOTE
• The stop selection setting is disabled when following functions are operating.
Position control
Power failure stop function (Pr.261)
PU stop (Pr.75)
Deceleration stop due to fault definition (Pr.875)
Deceleration stop due to communication error (Pr.502)
Offline auto tuning (with motor rotation)
• When Pr.250 ≠ "9999 or 8888", acceleration/deceleration is performed in accordance to the frequency command until the
output is shut off by turning OFF the start signal.
• When the restart signal is turned ON during the motor coasting, the operation is resumed from Pr.13 Starting frequency.
• Even with the setting of coasting to a stop, when the LX signal is turned ON, the motor does not coast but zero speed control
or servo lock is applied.
 Start signal operation selection
 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
rotation start
Reverse
rotation start
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.
• The STF and STR signals are assigned to terminals STF and STR in the initial status. The STF signal can be assigned to
terminal STF only using Pr.178 STF terminal function selection, and the STR signal can be assigned to terminal STR only
using Pr.179 STR terminal function selection.
 3-wire type (STF signal, STR signal, STP (STOP) signal)
• The following figure shows the 3-wire type connection.
• The self-holding function is enabled when the STP (STOP) signal is turned ON. In such case, the forward/reverse signal
is simply used as a start signal.
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STF
Inverter
STR
SD
10
2
5
ON
ON
search engine
Start signal
Forward/
reverse
signal
Time
STF
STR
2-wire type connection example (Pr.250 = "8888")
STF
Inverter
STR
SD
10
2
5
ON
ON
5. PARAMETERS
5.16 (G) Control parameters
1
2
3
4
5
6
7
page 411.)
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Time
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