6-47
• When the RUN command for forward or reverse rotation is input, the Inverter will start operating at the
lower limit regardless of whether the UP/DOWN command is input or not.
• When the UP/DOWN function and inching frequency command are both assigned to multi-function
inputs, an inching frequency command input will have the highest priority.
• If n100 for UP/DOWN frequency storage is set to 1, the output frequency held by the UP/DOWN func-
tion for 5 s or more will be stored in the memory. The output frequency will be held by the UP/DOWN
function when both UP and DOWN commands are ON or OFF together.
6-10-10 Input Open-phase Detection (n166, n167)
• The input open-phase detection function is provided for 5.5- and 7.5-kW Inverters only.
• This function detects the occurrence of an input power supply open phase. The open phase is de-
tected by means of fluctuations in the main circuit DC voltage, enabling detection of power supply volt-
age fluctuations and imbalances, decreasing values due to ageing of the main circuit capacitor, and so
on, in the same way.
• If the fluctuations in the main circuit DC voltage exceed the input open-phase detection level (n166),
and persist at this level for longer than the input open-phase detection time (n167), a main-circuit volt-
age fault (PF) will be detected.
n166
Input Open-phase Detection Level Register 01A6 Hex Changes during
operation
No
Setting
range
0 to 100 Unit of
setting
1 % Default setting 0
n167
Input Open-phase Detection Time Register 01A7 Hex Changes during
operation
No
Setting
range
0 to 255 Unit of
setting
1 s Default setting 0
Set Values
• For the input open-phase detection level (n166), set the main-circuit DC voltage fluctuation level for
detecting an input open phase. Set the level as a percentage, as follows:
200-V-class Inverters: Take 400 V as 100%.
400-V-class Inverters: Take 800 V as 100%.
• For the input open-phase detection time (n167), set the time (in seconds) for detecting an input open
phase.
Note 1. The following values are recommended for detecting an input open phase: n166 = 7 (%); n167
= 10 (s)
Note 2. If either n166 or n167 is set to 0, the input open-phase detection function will be disabled.
6-10-11 Output Open-phase Detection (n168, n169)
• The output open-phase detection function is provided for 5.5-kW and 7.5-kW Inverters only.
• This function detects the occurrence of an output terminal open phase. The detection is performed at
the current flowing at each output phase.
• If the current in any of the Inverter output phases becomes less than the output open-phase detection
level (n168) and persists at this level for longer than the output open-phase detection time (n169), an
output open-phase fault (LF) will be detected.
Advanced Operation Chapter 6
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