Hitachi SJ700-055HFF2 Instruction Manual Download Page 31

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Chapter 2 Installation and Wiring

2 - 9

About the emergency stop function

(disabled by the factory setting)

- The SJ700 series inverter has the function of "uncontrolled stopping by removal of motor power" in

accordance with Stop Category 0 defined by EN60204-1. The inverter is also designed to comply with
Safety Category 3 of EN954-1. This function is generally called Safe Stop function.

- The emergency stop function shuts off the inverter output (i.e. stops the switching operation of the main

circuit elements) in response to a command from a hardware circuit via an intelligent input terminal
without the operation by internal CPU software.

Note: The emergency stop function does not electrically shut off the inverter but merely stops the switching

operation of the main circuit elements. Therefore, do not touch any terminals of the inverter or any
power lines, e.g., motor cables. Otherwise, electric shock, injury, or ground fault may result.

Note: All systems that include an inverter must comply with the requirements of EN60204-1 (safety of

machinery) and other applicable standards. You must confirm the contents of standards applicable
to your system.

Note: Before installing a system using Safe Stop function, you must fully examine whether Safe Stop

function and the safety category to be applied are adequate for your system. For details, refer to the
standards required for your system.

Note: Every system must be configured with an inverter, a motor, and an external shutoff device. The

external shutoff device must at least comply with Safety Category 3 of EN954-1.

Note: Safe Stop function is not intended for electrical insulation between the inverter and motor. If

necessary, connect a shut off device (e.g., contactor) to the motor connection cable.

Note: Safe Stop function is not designed to prevent malfunctions in drive process control and application

functions.

Note: Carefully note that digital outputs (i.e., relay and open collector outputs) are not regarded as the

safety-related signals described here. The signals output from externally installed safety relays must
be used for the safety-related control circuits installed for your system.

- When the emergency stop function is enabled, intelligent input terminals 1 and 3 are used exclusively for

this function, and no other functions can be assigned to these terminals. Even if other functions have
been assigned to these terminals, these are automatically disabled and these terminals are used
exclusively for the emergency stop function.
Terminal [1] function:

This terminal always serves as the a (NO) contact for the reset (RS) signal.
This signal resets the inverter and releases the inverter from the trip due to emergency stop (E37.*).

Terminal [3] function:

This terminal always serves as the b (NC) contact for the emergency stop (EMR) signal.
This signal shuts off the inverter output without the operation by internal CPU software.
This signal makes the inverter trip due to emergency stop (E37.*).

Note: If intelligent input terminal 3 is left unconnected, the cable connected to the terminal is disconnected,

or the signal logic is improper, the inverter trips due to emergency stop (E37.*). If this occurs, check
and correct the wiring and signal logic, and then input the reset (RS) signal.
Only the reset (RS) signal input from intelligent input terminal [1] can release the inverter from
tripping due to emergency stop (E37.*). (The inverter cannot be released from the E37.* status by
any operation from the digital operator.)

- To enable the emergency stop function, set the slide lever of slide switch SW1 to ON. (With the factory

setting, slide switch SW1 is set to OFF to disable the function.)

Note: Before operating slide switch SW1, make sure that the input power supply is off.
Note: Carefully note that improperly turning slide switch SW1 on or off will automatically change function

assignments to the control terminals of the inverter.