Renishaw RCU10, Installation And User Manual, Page: 94 / 202

Connector pinout and hardware installation details B-3
B.2.2 Wiring requirements
The supply does not require a shielded cable. A filter is employed at the supply inlet and is
effective on both 24 V and 0 V from the power supply unit (PSU) – the system 0 V and
case / ground are connected at the other end of this filter (see Figure B.1). The system
0 V may also be connected to PSU 0 V but the benefit of the inlet filter may be reduced.
For longer cable runs, a 24 V-sense line is available on the connector for remote sensing
(see Figure B.1).
Figure B.1 – Power supply wiring with optional sense connection
The RCU10 will operate between 22 V and 26 V and has reverse and overvoltage
protection.
The supply is reverse voltage protected and, if the supply is taken above its normal
operating range, will be protected by means of an inline thermal fuse and Crowbar circuit,
which shorts the 24 V supply and causes the fuse to set. To reset the fuse, the power
must be completely removed from the unit for a number of seconds and then re-applied.
The protection circuit will allow safe operation up to
±
35 V across the supply terminals, but
operation above these levels will result in damage.
NOTE: The action of the fuse is to remove power from the RCU10 unit. Until the fuse has
tripped, the supply will be short-circuited.
Figure B.2 – Inline thermal fuse
Thermal Fuse
300mA
Over
Voltage
Supply Inlet
24 V
24 V Sense
0V
24 V
End-panel
earthing screws
1
2
3
4
24 V power supply
0 V