Amplifier OK input
This signal (pin 19) is produced by the servo power amplifier to inform the connected UCC2 controller that ALL the servo power amplifiers
have been successfully enabled, it is an active low signal i.e. pulled to 0 V (+24 return) to indicate success. This signal is a response to an active
‘amp control' signal from the controller. This signal is also available on the SPA connector pin 23.
CMM declutch
This input on pin 20 should normally be pulled down to the 0 V return line, to signal to the controller that the CMM's drives are mechanically
connected to the moving elements of the machine, i.e. in their normal condition. The input should be open circuit, or held high, when a CMM
has been temporarily ‘de‐clutched' from its drive motors to allow manual positioning. The servo system will not drive the motors in this
condition and will resume control at the machine‘s position when he signal again goes low.
E-STOP tripped
This input ﴾pin 21﴿ is used to inform the UCC2 of the CMM ‘emergency stop' condition ﴾E‐STOP﴿. This signal is also available on the SPA
connector pin 24. If the input pin is pulled down to the 24 V return line, the UCC2 will assume that there is no emergency stop active and will
allow the servo motors to be energised. If the input pin is open-circuit or near +24 V the UCC2 will assume that the emergency stop is active
and will disable all motors, and inform the host computer of the event.
NOTE:
No motor can be enabled while this input is high or open-circuit.
UCC2 and UCC2-2 installation guide
www.renishaw.com
Issued 07 2021
25
