Hitachi SJ100 Series Montage- und Bedienungsanleitung

Application Note:

Three-Wire Control

(STA, STP, F/R) with L100

and SJ100 Series Inverters

Please refer also to the L100 or SJ100

Inverter Instruction Manual

AN021003-1

Rev. 1 11-14-03

Hitachi America, Ltd.

Application Note for “Three-Wire Control” with

Hitachi L100 & SJ100 Series Inverters

Sometimes it may be desirable to use a remote START/STOP pushbutton arrangement

together with an inverter. This often occurs when a machine is being retrofitted or

upgraded with the addition of a Hitachi inverter as a replacement for a motor starter. The

pushbuttons that interfaced with the original motor starter would typically be a single-

pole normally-open momentary pushbutton for the START button, and a single-pole

normally-closed momentary pushbutton for the STOP button. Sometimes a switch may

also be present for selecting the forward or reverse direction of rotation.

In the case of the L300P or SJ300 Series of inverters, a function is built-in to directly

interface to a START/STOP pushbutton arrangement of this type without any additional

hardware. Additionally, a FORWARD/REVERSE signal can be accommodated, hence

the term “three-wire” control. The three signals are wired directly to three intelligent

input terminals.

In the case of the L100 and SJ100, such a function is not built in. However the

START/STOP functionality (without direction control, i.e. FWD only) can be

accomplished simply with the addition of a single external control relay, using a circuit

similar to that in the diagram below. This is a simple seal or latch circuit.

L100 or SJ100

Inverter

RUN

STA P24

IN 1

[FW]

CM1

STP RUN

24 VDC SPST

Control Relay

The above circuit does not include FWD/REV direction change functionality. If this is a

requirement, a more elaborate arrangement is needed. Two relays would be necessary,

and the STOP pushbutton would have to be DPST NC type, as shown in the example that

follows on the next page.

L100 or SJ100

Inverter

RUN FWD

STA FWD P24

IN 1

[FWD]

CM1

STP RUN

FWD

STA REV

RUN REV

STP

RUN REV

IN 2

[REV]

In this circuit, pushing the STA FWD button would start the inverter in the forward

direction, while pushing the STA REV button would start reverse operation. If it is

desired to change rotation direction while running, the STOP button would have to be

pushed first, then the desired run direction button. That is because the inverter will ignore

a REV run command when a FWD run command is already present, and vice versa.

Pushing the buttons in this sequence will cause the inverter will ramp the motor down to

a stop, then ramp up in the opposite direction, according to its configuration settings.

Andere Handbücher für SJ100 Series

Dieses Handbuch passt für folgende Modelle

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