Installation guide

24 Installing the SPA1
4.6 Adjustment of the inductance of the motor drive system
When using the Mini Maestro drives it is necessary, when a motor has an inductance of less than 1mH, to
have an inductor connected between the motor and the drive. The SPA1 has a 10 mH inductor fitted to
the system as default. This can be removed if not required.
If the inductance of the SPA1 and motor combination is to high then the CMM will tend to overshoot when
positioning. If this happens remove the inductance by following steps 1 to 6 below.
If the inductance of the SPA1 and motor combination is too low the drive will oscillate and an audible
whistle will be heard. If this happens reinstate the inductance by following steps 1 to 6 below but connect
the link between IN and COM in step 4.
WARNINGS:
- It is essential that full anti-static precautions be taken before working within the SPA1 enclosure.
- The SPA1 unit contains components that store energy. After power has been removed the installation
engineer should wait a minimum of 30 seconds prior to working within the SPA1 enclosure.
1. Remove AC supply from SPA1 and disconnect other system cables to CMM.
2. Remove top panel of the SPA1 enclosure; ensure that all fixing screws are retained for future re-
assembly.
This is completed by removal of a screw from each side of the SPA1 unit towards the front of the
enclosure, and removal of the 5 screws across the top of the rear panel of the SPA1. Then the top of
the SPA1 can be removed by pulling upward on the lid of the unit.
3. Identify the axis channel that requires the inductor to be removed from the drive system, these are
showninfigure15.
Figure 15 - SPA1 with top of enclosure removed
XaxisZaxis Yaxis