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The SPA3 is a servo power amplifier with enhancements for higher power and category 2 E-STOP.

  • SPA3 2011SPA3 can be used with the current range of Renishaw controllers
  • The high power capability combined with a compact enclosure enables use of the SPA3 across a wide range of machines
  • The SPA3 CMM amplifier has the capability to:
    • power three axes of a CMM
    • accept input signals from air pressure, crash detection and all axis inner and outer travel limit switches
    • accept two uncommitted general purpose input signals and generate one uncommitted general purpose output signal
    • provide a +24 V supply for use by the CMM switches
    • support the MCUlite-2 joystick, and also support the MCU5, MCU5-2, MCU W and MCU W-2
    • provide power output of up to 800 W continuous and 960 W for up to 1 second
    • set the voltage of each axis independently allowing differing motor voltages to be used
    • support dc motors in the range 12 V to 80 V and currents up to 10 A
    • support encoder / tacho or linear encoders (torque mode) for velocity feedback
    • provide category 2 E-STOP

Technical specification

SPA comparison

■ Standard specification

- Not available

(1) Peak power of 600 W can be drawn for a maximum of 50 seconds

* SPA2-2 4-axis, 5-axis and 6-axis versions also available (for use with UCC2-2 only)

SPA2-2 (3-axis) *


UCC controller compatibility


UCC2-2, UCC T3-2, UCC T3 PLUS, UCC S3 or UCC T5

Servo amplifier channels



Additional servo amplifier channels

1 (UCC2-2 systems only)


Total output power

600 W

960 W max. (PSU dependent)

Maximum continuous power per channel

300 W (1)

800 W (PSU dependent)

Peak power per channel (dependent on application)

600 W

960 W (PSU dependent)

Amplifier output (motor) voltage

12 V to 60 V variable

12 V to 80 V variable

Amplifier current

0 A to 10 A programmable

0 A to 10 A programmable

Emergency stop compatibility

Category '2' E-STOP

Category '2' E-STOP

Tuning method



DC brushed motor compatibility

Tacho motor velocity feedback

Tacholess velocity feedback

Encoder velocity feedback

AC power supply



Power supply - input

85 V to 132 V ac, 170 V to 264 V ac, 47 Hz to 63 Hz, 650 W

PSU dependent

Environment - storage

-10 °C to +70 °C (+14 °F to +158 °F)

-10 °C to +70 °C (+14 °F to +158 °F)

Environment - operation

+10 °C to +50 °C (+50 °F to +122 °F) local to UCC

+5 °C to +50 °C (+41 °F to +122 °F) local to UCC



435 mm (19 in enclosure)

440 mm (19 in enclosure)


3U (127 mm)

1U (44 mm)


330 mm

180 mm


9.48 kg (20 lb 14 oz) (maximum - 7-axis system)

2.84 kg (6 lb 4 oz)

UCC retrofit

Renishaw has formed a technical partnership with some of the industry's leading software companies and retrofitters to provide powerful CMM retrofit solutions using Renishaw's UCC controllers.


Learn about retrofitting options for your CMM.

Extended warranty

For peace of mind a 3-year warranty is available for your new CMM products during the first 3 months from purchase. Contact your vendor.

Product information