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The SPA2 is a 4-channel digital servo power amplifier with an integral power supply.

SPA2-2 has been optimised to work with the UCC2-2 CMM controller and MCU5 joystick, together forming an ideal retrofit package.


Key features:

  • For each amplifier channel, there are individual software controls for all the tuning parameters including offset, gain, integral and proportional settings
  • Motor and tacho polarities can be inverted by software
  • Power supply can be set to provide a voltage output from 12 V to 60 V
  • Maximum total output power is 600 W
  • Each channel can deliver 10 A peak or 5 A continuous
  • As well as the servo power amplifiers, SPA2-2 contains all the relays to control the motor engaging process. It also contains all the necessary hardware to implement a category '2' emergency stop system

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)


There are various kits available depending on the application. Please contact your local Renishaw supplier for information about other kit options.

KitKit contentsNotes
SPA2-2 kit 3-axis dc3-axis kit including cables

3-axis configuration suitable for conventional CMMs fitted with brushed dc motors.

It can accommodate both tacho and tacholess velocity feedback systems and, with the addition of an encoder interface card, it can also accommodate encoder velocity feedback.

An additional card can be fitted to extend these units to a 4-axis system.

SPA2-2 6-axis dc kitConfiguration suitable for installations requiring between five or six amplifiers.Like the 3-axis version, these can accommodate both tacho and tacholess velocity feedback systems and, with the addition of encoder interface cards, can also accommodate encoder velocity feedback. An additional axis card can be fitted to extend this unit to a 7-axis system.
SPA2-2 3-axis + REVO kitConfigured to support a REVO 5-axis scanning head, with 3 axes available for CMM control.Can be increased to four CMM axes with the use of an additional card.
SPA2-2 4th axis interface cardPlug-in board which can be fitted to provide an additional axis for the 3-axis, 6-axis or 3-axis + REVO kits

The motor connector on this card is a type that will support a brushless or linear motor and is not the same as the standard brushed motor connector.

To avoid supply problems a mating plug and backshell is included as part of the kit.

Scale / encoder kit4 off 15 W HDD plugs and backshells to support the connection of either the UCC axis scale inputs or the SPA motor encoder inputs.For connectors to support a UCC2-2 / SPA2-2 system on a CMM fitted with encoder velocity feedback, then two of these kits will be required.
SPA2-2 connector kit

3 off 7W2 type plugs for the motor / tacho connections.

1 off 9W D type socket for the emergency stop.

Appropriate backshells for each motor connector.

Connectors and backshells to support the connection of the axis motors and the machine emergency stop system.

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