Hitachi NES1-004SB Quick Reference Manual page 132

7.7.4 Unattended start protection (USP) function
The unattended start protection function allows you to make the inverter trip with error code "E13"
displayed if the inverter power is turned on when an operation command has been turned on.
You can recover the inverter from tripping by performing the reset operation or turning the operation
command off. (See example 1.)
If the inverter is recovered from tripping with the operation command left turned on, the inverter will start
operation immediately after recovery. (See example 2.)
The inverter can operate normally when an operation command is turned on after the inverter power is
turned on. (See example 3.)
To use this function, assign function "13" (USP) to one of the terminal [1] to [5] functions (C001 to C005).
This function is invalid with the standard operation panel (RUN/STOP/RESET key).
When it is input a run command from the operator or Modbus within two seconds after the power supply
injection, the inverter trip(E13).
The following charts show examples of the timing of the unattended start protection operation:
(Example 1)
Power
supply
FW
USP
RS
Alarm
Output
frequency
Item
Terminal [1] to [5] functions
(Example 2)
Power
supply
FW
USP
RS
Alarm
Output
frequency
Function code Data
C001 to C005
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Chapter 7 Explanation of Functions
(Example 3)
Power
supply
FW
USP
RS
Alarm
Output
frequency
13 USP: Unattended start protection
Description