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6.1
External Shunt Resistor
LX drives leave the factory with the internal shunt resistor enabled through an externally
wired jumper between terminal pins 27 and 28. If the power rating of the internal shunt
resistor is insufficient for heavy cycles an external shunt resistor with greater power
capacity should be added.
The internal shunt resistor capacity on all LX drives is 150 watts.
Figure 6.1 Internal shunt connection
(default).
To use an external shunt resistor:
1.
Remove jumper between terminals 27 and 28.
2.
Connect the external shunt resistor between terminals 27 and 29.
WARNING:
To avoid damaging the shunt driving circuit when using an external shunt
resistor:
Remove the Internal Shunt jumper from the connection strip
Ø
Do not use a resistor value less than 33 Ω Ω Ω Ω
Ø
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6
SPECIAL APPLICATIONS
Figure 6.2 External shunt connection
Section 6– Page 1
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