Hitachi SJ Series, User Manual

Page: 377 / 786

12-17-16
Chapter 12 Inverter Functions
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Decision for Switching to the Bypass Mode
• When the [PA-04] bypass function selection is set
to 01: Enabled, if the [PA-05] bypass function delay
time passes during the forced operation without
reaching the Em-Force mode frequency setting
[PA-02] and the inverter enters the operation ready
incomplete status (output terminal [IRDY] is OFF), it
operates in the commercial operation mode
(bypass mode).
• In the bypass mode, the following functions are
operating automatically.
(1) Soft lock status (equivalent to [UA-16] = 01) The
parameters can be no longer changed. To restore
the settings, turn off
[EMF], restore the power and
then change the parameters.
(2) Auto-reset (equivalent to [bb-10] = 00)
Auto-reset is disabled.
(3) STOP key disabled (equivalent to [AA-13] = 00)
Disable the STOP/RESET keys on the operator
keypad.
(4) Operation enabled during the optional start
([oA-13] = 01, [oA-23] = 01, [oA-33] = 01)
The operation is allowed even in the optional
start-up.
• The functions except for the above operate
according to the settings.
• Once the bypass mode is turned on, the inverter
keeps shutting off until the power is off.
• While the inverter is operating immediately after the
reset, the output terminal [IRDY] is turned off for
about a second, however, the bypass mode is not
entered for that period.
・
When frequency doesn't reach to Em-Force mode
frequency setting [PA-02] while upper limiter function
is activated, accumulation of delay time is added,
A
!
!
Input terminal
[EMF]
Output terminal
[IRDY]
Output
frequency
Bypass delay time
integrated value
[IRDY] OFF
[PA-05]
[PA-02]
Output terminal
[EMFC]
Output terminal
[EMBP]
Forced operation Bypass mode
Status
Bypass mode
delay time
Output reached