MTS Systems MPA-05-460, Manual

Page: 44 / 45

44
Start-Up
Once normal wiring is verified, power can be applied to the amplifier.
Assure the DIP switch and jumpers are set as required. Default settings are for 6 pole
motors on the amplifiers. Inputs Reset, +Limit, and -Limit are not going to disable the
amplifier if they are not connected. Never change the settings of DIP switch 2 with power
ON.
The CUR and RESP adjustments are turned down (CCW). CUR is 50% and RESP is
minimal.
It is recommended that CUR be turned to its full CCW position. Once power is applied,
CUR can be slowly increased in a CW direction to achieve shaft torque. Crispness can be
increased by a CW adjustment of RESP.
For start-up verification of wiring with external position controls the following simple test
can be used to verify the phase relationship.
With the current limit turned full CCW or with the RST wiring disconnected, a CW rotation
of the motor shaft will produce a negative command voltage at pin #9 (SIG) to pin #11
(GND) on the I/O (J1) connector. For a CCW rotation, a positive command must occur.
The rotation is started from a null, or a close to zero shaft position. If the relationship is
wrong, there are two choices:
1. interchange the A, A\ and B, B\ signals at the simulated encoder.
2.
use the command - input for signal and pin #11 is still ground.
Either method works, but the first method still assures that positive command voltages
cause CW rotation of the motor shaft as viewed from the shaft end of the motor.