9-6
9.6.3 Notes
(1) Wiring for terminal [EN]
- When using terminal [EN], be sure to remove the short-circuit wire from terminals [EN] and [PLC], which has been
connected at the shipment.
- '[EN] & [PLC]' terminals are safety related wire connections and therefore careful installation practices shall be applied
to ensure no 'short-circuit(s)' can occur to these connections.
- For opening and closing the hardware circuit between terminals [EN] and [PLC], use safety approved components such
as safety switches and safety relays that comply with EN954-1, Category 3 or higher to ensure a complete shutoff.
- Be sure to use shielded wires for connecting terminals [EN] and [PLC] and ground the shielding layer. Do not
connect/mix any other control signal wire within the same shielded core.
- It is the responsibility of the machinery manufacturer to guarantee that a short-circuiting or other fault does not occur in
wiring of external safety components between terminals [EN] and [PLC].
Fault examples:
• Terminals [EN] and [PLC] are short-circuited due to the wiring being caught in the door of the control panel so that a
current continues to flow in terminal [EN] although the safety component is OFF and therefore the safety function
will/may NOT operate
• The wiring is in contact with any other wire so that a current continues to flow in terminal [EN] and therefore the
safety function will/may NOT operate
(2) Other notes
- When configuring the product safety system with this safety stop function, make a risk assessment of not only the
external equipment and wiring connected to terminal [EN] but also the whole system including other equipment,
devices and wiring against the product safety system required by the machinery manufacturer under the manufacturer's
responsibility in order to confirm that the whole system conforms to the product safety system required by the
machinery manufacturer.
In addition, as preventive maintenance, the machinery manufacturer must perform periodical inspections to check that
the product safety system properly functions.
- To make the inverter compliant with EN954-1, Category 3, it is necessary to install the inverter on a control panel with
the enclosure rating of IP54 or above.
This safety stop function coasts the motor to a stop. When a mechanical brake is used to stop or hold the motor for the
sake of the product safety system of whole system, do not use the inverter's control signals such as output from terminal
[Y]. (Using control signals does not satisfy the safety standards because of software intervention.) Use safety
components complying with EN954-1, Category 3 or higher to activate mechanical brakes.
- The safety shutdown circuit between terminal [EN] input section and inverter's output shutdown section is dual-
configured (redundant circuit) so that an occurrence of a single fault does not detract the safety stop function.
If a single fault is detected in the safety shutdown circuit, the inverter coasts the motor to a stop even with the terminal
[EN]-[PLC] state being ON, as well as outputting an alarm to external equipment. (Note that the alarm output function
is not guaranteed to all of single faults.)
- This safety stop function may not completely shut off the power supply to the motor electrically. Before performing
wiring or maintenance jobs, be sure to disconnect/isolate the input power to the inverter and wait at least 5 minutes for
22 kW or below of inverters, and at least 10 minutes for 30 kW or above.
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