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LEROY-SOMER
3.4.4. Mains PF adjustment:
Do not apply the 4/20mA current
Set CA1 to position 1, CA5 to the ON position, P15 = 5
Connect the alternator to the mains and select the alternator PF adjustment function (2F)
Apply the 4/20mA current – Adjust to obtain 12mA
LED 5 should light.
Set P6 to the centre position.
Close the mains PF contact connected to terminals J2-17/18
LED 4 should light.
If the adjustment differs, set jumper CA1 to 2.
Adjust the gain, if required, with P15 (position 10 = maximum gain)
In the absence of a 4/20mA current, the setpoint automatically returns to the internal setpoint value for the
function used and contact C9 is closed.
3.5.
External voltage potentiometer:
The external voltage potentiometer of the R 449 or R 452 (470Ω for +/-5%Un and 1kΩ for +/-10%Un) is
transferred to terminals J3-24/25 of the R 729 when these are combined with the R729.
3.6.
Limitation of minimum excitation current
This function only acts when the alternator is in parallel with the mains.
It controls the excitation current to adjust the amount of reactive power that the alternator can absorb at very
low load and at full load.
Potentiometer P10 adjusts the amount of reactive power that the alternator can absorb at very low load.
Potentiometer P9 adjusts the amount of reactive power that the alternator can absorb at full load.
The function is activated by setting jumper CA10 to the ON position and deactivated by setting it to the OFF
position
While the excitation current is limited, LED 10 (red) is lit and contact C10 is closed (terminals J4-41/42 ).
3.7.
Limitation of maximum excitation current
This function controls the excitation current to limit the alternator's stator current when in over-load or in the
event of repeated load surges. This limitation takes effect after a time delay of 10 seconds and at 110% of
the excitation current.
This threshold is adjusted with potentiometer P8.
The function is activated by setting jumper CA8 to the ON position and deactivated by setting it to the OFF
position
While the excitation current is limited, LED 8 (red) is lit and contact C8 is closed (terminals J4-39/40).
Note: When the alternator is short-circuited, the maximum excitation current is controlled with potentiometer
P5 on the R 449 or R 452 unit.
9
INSTALLATION & MAINTENANCE
MODULE R729
Limiting functions
4010 en – 03.2011 / b
9
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