Command common
An analogue reference zero is available to the servo power amplifiers but this signal is not used by our SPA1 and SPA2 amplifiers although
some third party units do require this reference. It is important that this is not used as a 0 V return for digital signals because this will inject
noise into the velocity demands. This pin (16) should be left open circuit if not required.
Reserved
These pins (17 to 20) have high-speed serial communication driver / receivers connected to them, they are intended for future development. It
is important that these pins should be left open circuit.
Contactor feedback
This is a confirmation signal from the motor contactor to the UCC2 that is has successfully operated and the motors are now engaged. This
signal was on the I/O connector (pin 24) for the UCC1 and is still available on that connector on the UCC2 for backwards compatibility
reasons.
AMPs OK
This is a confirmation signal (pin 23) from the servo amplifiers that they on and ready. It is produced as a response to the Enable Amps
command. This signal was on the I/O connector (pin 19) for the UCC1 and is still available on that connector on the UCC2 for backwards
compatibility reasons.
E-STOP tripped
This input ﴾pin 24﴿ is used to inform the UCC2 of the CMM ‘Emergency Stop' condition ﴾E‐STOP﴿. If the input pin is pulled down to 0 V ﴾24 V
return) the UCC2 will assume that there is no emergency stop active and allow the servo motors to be energised. This input is also on the I/O
connector pin 21.
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.
0 V (24 V return)
This is the 0 V reference connection for all the digital and switching signals, unless otherwise stated the 0 V connections from all external
devices should be connected to this line. This signal line is available on pin 25 on the SPA connector and pins 37 and 44 of the I/O connector.
It is taken to a star point within the UCC2 controller where it is connected to protective ground, cable screens and all the internal supply 0 V
lines. The star point must be the only point that these different 0 V and ground connections are made.
UCC2 and UCC2-2 installation guide
www.renishaw.com
Issued 07 2021
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