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18
Rear panel description
3.3.6
Earth stud
The SPA 2 has an earth stud to permit equipotential bonding of the CMM control system to that of the rest
of the CMM.
NOTE: When the SPA 2 is used with the UCC 2 or UCC lite controller the CMM frame should be bonded to
the SPA 2 earth stud and not the UCC 2 or UCC lite earth stud.
3.3.7
External emergency stop connection
This 9-pin D-type connection is designed to permit connection of external emergency stop devices to the
Renishaw controller emergency stop system.
Emergency stop devices must meet the requirements of IEC 60947-5-1 (low-voltage switchgear and
controlgear – part 5-1: control circuit devices and switching elements – electromechanical control circuit
devices) or UL1054 (standard for special-use switches).
The machine manufacturer or product installer must perform a risk assessment to determine the
requirements for emergency stopping and emergency switching off. The SPA 2 emergency stop safety
system is designed to achieve category 2 to standard EN954-1:1996 (ISO 13849-1). The risk assessment
should therefore have determined that a category 2 safety function is satisfactory.
There are three connection pins available on this connector. Please refer to the table below for their
functions:
Pin number
6
7
9
Any additional emergency stop component that is fitted to this connector must have the following electrical
characteristics:
Emergency stop system voltage : 24 V
Emergency stop system current : 1 A
NOTE: If the emergency stop reset function is not required then it will be necessary to connect pins 5 and
9 so that when an emergency stop is removed from the system, it will automatically reset.
If no additional emergency stop devices are to be added to a UCC 2 or UCC lite controller system, connect
pins 6 and 7 to permit the MCU1 emergency stop switch to function.
It is strongly recommended that all connections to this connector be fitted by a competent technician or
engineer and that all wires should be sleeved. See also 6.4.2.
It should not be necessary to switch off the SPA 2 in an emergency but if a requirement is indicated by the
user's risk assessment, emergency switching off for the complete machine must be implemented
externally to the SPA 2 .
Function
ESTOP A
ESTOP B
RESET B
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