Scale inputs (15 pin HDD socket)

These connectors are suppied pre-blanked for use with UCC2.

Remove blanking plugs for use with UCC T5 only.

These inputs are RS422 compatible scale inputs for each of the machine axes through the 15 W HDD connectors.

NOTE: If the machine scale is of a different format (e.g. analogue, single ended) then this will require an external adaptor.

15 pin HDD socket  

Pin no.Function

1

External N/C

2

0 V supply

3

- Error

4

- Reference mark

5

- B signal

6

- A signal

7

+ 5.25 V supply

8

+ 5.25 V supply

9

0 V supply

10

Limit switch Q

11

+ Error / limit switch P

12

+ Reference mark

13

+ B signal

14

+ A signal

15

Inner screen

Shell

Outer screen

Scale supply voltage is 5.25 V at 350 mA from each read head connector. Scale quadrature signals with ideal waveforms and phase displacement with an edge rate of up to 40 MHz.

Scale input signals to be to EIA specification RS422.

Scale input 
SPA3 input circuits for CMM read head – scale and reference mark inputs

SPA3 error interface circuit

Supports the error signal as integrated to the Renishaw range of RGH24 read heads. If the error signal is not integrated into the connected read head then it is necessary to configure the connection as indicated below.

  • -error (pin 3) link to 5.25 V (pin 7)

spa3 scale error circuit