108
"B" Group: Fine Tuning Functions Section 3-6
When the terminal [SFT] is turned ON, the data of all the parameters and
functions (except the output frequency, depending on the setting of
B031) is
locked (prohibited from editing). When the data is locked, the keypad keys
cannot edit inverter parameters. To edit parameters again, turn OFF the [SFT]
terminal input.
3-6-6 Motor Cable Length Parameter
To achieve higher motor control performance, the MX2 inverter has the Motor
Cable Length Parameter setting B033. Normally there is no need to adjust this
parameter, however in case of long motor cable and/or shielded cable, where
there is a comparatively higher earth capacitance, set this parameter higher to
achieve better motor control performance.
Note that the parameter is indicative and no formula to calculate the suitable
value. Normally, longer the motor cable, bigger the set value. Please adjust
depending on your system.
For 11 and 15 kW inverter, it is not needed to set b033.
3-6-7 Run/power ON warning time
Inverter outputs the operation time over (RNT) or the plug-in time over (ONT)
signal when the time specified as the run/power ON warning time (b034) is
exceeded.
1. Operation time over (RNT) signal
To use this signal function, assign function "11 (RNT)" to one of the intelligent
output terminals [11] to [12] (C021 to C022), or to the alarm relay output
(C026). Specify the run/power-ON warning time (b034).
2. Plug-in time over (ONT) signal
To use this signal function, assign function "12 (ONT)" to one of the intelligent
output terminals [11] to [12] (C021 to C022), or to the alarm relay output
(C026). Specify the run/power-ON warning time (b034).
3-6-8 Rotation restriction related parameters
Rotation direction restriction: b035 – The rotation direction restriction func-
tion allows you to restrict the direction of the motor rotation. This function is
effective regardless of the specification of operation command input device
(e.g., control terminal or integrated operator). If an operation command to
drive the motor in a restricted direction is given, the inverter (display) shows
().
Reverse run protection: b046 – The reverse run protection function is effec-
tive when "03 (sensorless vector control)" is specified for the V/F characteris-
tic selection (A044). For control reasons, especially during motor operation at
"B" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
B033 Motor cable length parameter Set range is 5 to 20. 8 10. –
"B" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
b034 Run/power ON warning time Range is,
0.:Warning disabled
1. to 9999.:
10~99,990 hrs (unit: 10)
1000 to 6553:
100,000~655,350 hrs
(unit: 100)
8 0.Hrs.
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