MITSUBISHI ELECTRIC FR-S520 - Manual (Page 144)

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.15.5 PU disconnection detection/PU setting lock
You can choose the connector disconnection detection function of the parameter
unit (FR-PU04) and the operation write of the parameter unit (FR-PU04).
PU disconnection detection : This function detects that the parameter unit
(FR-PU04) has been disconnected from the
inverter for longer than 1 second and causes
the inverter to provide an alarm output (PUE)
and come to an alarm stop. When the PU has
been disconnected since before power-on, it is
not judged as an alarm.
PU operation : Operation performed to perform running,
frequency setting or parameter setting from the
parameter unit (FR-PU04).
Parameter Name
Factory
Setting
Setting
Range
Remarks
n17 (993)
PU disconnection
detection/PU setting lock
0 0, 1, 10
Setting is enabled when
Pr. 30 = "1"
<Setting>
n17 Setting PU Disconnection Detection PU Setting Lock
0
Operation is continued as-is if the PU is
disconnected (without PU disconnection detection)
1
Inverter output is shut off when the PU is
disconnected (with PU disconnection detection)
PU operation valid
10
Operation is continued as-is if the PU is
disconnected (without PU disconnection detection)
PU operation invalid*
* The monitor display and
STOP
RESET
key are valid.
REMARKS
When RS-485 communication operation is performed through the RS-485
connector, the reset selection/PU stop selection function is valid but the PU
disconnection detection function is invalid.
CAUTION
Do not reset the inverter while the start signal is being input.
Doing so will cause the inverter to start immediately after a reset, leading to
hazardous conditions.