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Input Terminals
1
INSTALLATION AND WIRING
1.8 Input Terminals
1.8.1 Run (start) and stop (STF, STR)
To start and stop the motor, first switch on the input power supply of the inverter
(switch on the magnetic contactor, if any, in the input circuit during preparation for
operation), then start the motor with the forward or reverse rotation start signal.
POINT
With "1" factory-set in Pr. 507 "inverter operation lock mode setting", the start
signal is not enabled unless the SQ signal is on.
Set "0" in Pr. 507 when performing inverter operation only.
(Refer to page 138 for Pr. 507.)
(1) STF, STR
A connection is shown on the right.
1) The forward/reverse rotation signal is
used as both the start and stop signals.
Switch on either of the forward and
reverse rotation signals to start the
motor in the corresponding direction.
Switch on both or switch off the start
signal during operation to decelerate
the inverter to a stop.
2) The frequency setting signal may be
given by setting the required values in
Pr. 4 to Pr. 6 "three-speed setting"
(high, middle, low speeds), by setting
using a sequence ladder, or by setting
from CC-Link. (For three-speed
operation, refer to page 17.)
Connection Example
3) After the start signal has been input, the inverter starts operating when the frequency setting
signal reaches or exceeds the "starting frequency" set in Pr. 13 (factory-set to 0.5Hz).
If the motor load torque is large or the "torque boost" set in Pr. 0 is small, the inverter may be
overloaded due to insufficient torque.
If the "minimum frequency" set in Pr. 2 (factory setting = 0Hz) is 6Hz, for example, merely
entering the start signal causes the running frequency to reach the minimum frequency of 6Hz
according to the "acceleration time" set in Pr. 7.
4) To stop the motor, operate the DC injection brake for the period of "DC injection brake
operation time" set in Pr. 11 (factory setting = 0.5s) at not more than the DC injection brake
operation frequency or at not more than 0.5Hz.
To disable the DC injection brake function, set 0 in either of Pr. 11 "DC injection brake
operation time" and Pr. 12 "DC injection brake voltage".
In this case, the motor is coated to a stop at not more than the frequency set in Pr. 10 "DC
injection brake operation frequency" (0 to 120Hz variable) or at not more than 0.5Hz (when
the DC injection brake is not operated).
5) If the reverse rotation signal is input during forward rotation or the forward rotation signal is
input during reverse rotation, the inverter is decelerated and then switched to the opposite
output polarity without going through the stop mode.
NFB
R,S,T
Inverter
STF (Pr.65="17")
STR (Pr.63="9999")
SD
ON
Power
supply
Forward
rotation start
Reverse
rotation start
Output frequency
Across STF-SD
(STR)
Time