LA Series Linear Servo Amplifier Technical Reference Manual
14
6.3 Jumper Descriptions
JP1-A, B – Continuous Overcurrent Level – This setting determines the continuous level of current allowed
by the amplifier. Any phase current value above this setting causes an internal timer to run. If the timer
reaches the set value for Overcurrent Trip Time, the drive disables and the “L” error is displayed. The
decimal point on the LED display is lit when any phase current is above the Overcurrent setting. The
Overcurrent Timer accumulates time for any value of phase current that exceeds the Overcurrent threshold
value. The Overcurrent Timer is decremented for any phase current value less than the Overcurrent
threshold value. The decay rate of the timer is 2x the attack rate. This means that if the timer has
accumulated for 2 seconds, it takes 1 second for the timer to return back to 0.
JP1-C, D – Continuous Overcurrent Trip Time – This setting establishes the time that any phase current is
allowed to be above the Overcurrent setting. When the Overcurrent time is exceeded, the drive disables
and the Overcurrent error is reported (“L” on the display). The timer decays at a rate of 2x the attack rate.
JP1-E, F – Absolute Overcurrent – This setting establishes the maximum allowable current. If the current
exceeds the set value, the drive disables and the error is reported (“5”on the display). The amplifier is
designed to trip within 50mS of detecting the event.
JP1- G – Not used. Install this jumper if the desired amplifier setup requires no other jumpers. This will
prevent the software from using the stored NVM settings.
JP1-H – Motor Reverse – When this jumper is installed, the motor rotation in Hall mode is reversed for a
given input signal.
JP2- A – This jumper establishes the mode of operation for commutation, either Sine or Hall. In Sine
mode, the user must provide 2 analog input signals 120° out of phase, representing motor currents for
Phase A and Phase B. The amplifier internally derives the current for Phase C based on these inputs. In
Hall mode, the user provides a current reference command on Phase A input only. External Hall sensors
must be connected for motor commutation. The amplifier drives current to two of the three phases
depending on the Hall sequence input on the J3 Motor Feedback connector.
JP2- B, C – These jumpers establish the Input Filter setting. The cutoff frequency for low pass filtering of
the analog input command signals is set according to the values shown above.
JP2-D, E – Transconductance Ratio – These jumpers determine the amount of output current, in amps, for
a given input voltage, in volts, on the reference input(s) Command A and Command B. (Volts to amps
ratio).
JP2 – F – Input DAC Selection – This setting establishes the voltage configuration for the Command A and
Command B input signal reference. In Single Ended mode, the inputs accept a +/-10vdc input
with respect to ground (common). In Differential mode, the C/-inputs accept a +/-20vdc signal
terminal-to-terminal, non-grounded.
JP3 – A,B - Current Loop Bandwidth – This setting establishes the current loop bandwidth setting. Use
caution when changing from one setting to the next. The user does not normally set these jumpers.
Please
contact the factory for details before changing these settings.
