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Start-Up
Once normal wiring is verified, power can be applied to the amplifier.
Assure the inputs are what are required. The Enable Input will disable the amplifier if it is not
connected.
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. The response adjustment should be optimized on
the highest speed first. Once the CUR Pot has been turned up, the RESP Pot is adjusted CW
until instability occurs, and is then turned slightly CCW until the instability is gone. This
adjustment is done at spindle speeds of 50-100 rpm. The adjustment should be checked on
all the possible speeds.
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.
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