Mitsubishi Electronics FR-S500 Input terminals, Run start and stop STF, STR, STOP

Input terminals

1.4 Input terminals

1.4.1Run (start) and stop (STF, STR, STOP)

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.

(1) Two-wire type connection (STF, STR)

A two-wire type 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 either be given by entering 0 to 5VDC (or 0 to 10VDC) across frequency setting input terminals 2-5 or by setting the required values in Pr. 4 to Pr. 6 "multi- speed setting" (high, middle, low speeds). (For multi-speed operation, refer to page 29.)

Power		NFB
				R, S, T
supply
				Inverter
Forward
				STF
rotation start
Reverse				STR (Pr.63= "- - -" )
rotation start
				SD
Output frequency
					Time
Across			ON
STF-SD
(STR)	2-wire type 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, operation may not be started due to insufficient torque until the inverter output frequency reaches about 3 to 6Hz.

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" or Pr. 12 "DC injection brake voltage".

In this case, the motor is coasted 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 without going through the stop mode.

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WIRING

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