Introduction; Power Supply; Input / Output Over-Current Protection - Renishaw NCi-4 Installations- Und Benutzerhandbuch

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Introduction

CNC machine tools using Renishaw NC1, NC3
or NC4 non-contact (NC) systems for tool setting
or broken tool detection require an interface unit.
The NCi-4 unit converts signals from the NC unit
into voltage-free, solid state relay (SSR) outputs
for transmission to the CNC machine control.
The NCi-4 interface unit should be installed in
the CNC control cabinet. Where possible, site the
unit away from potential sources of interference
such as transformers and motor controllers.
Only qualified persons should install and adjust
switches on the interface. Remove the mains
supply from the NCi-4 unit before removing the
cover.

Power supply

The NCi-4 interface can draw its power from the
CNC machine's nominal 12 V to 24 Vdc supply.
Its maximum input voltage is in the range 11 Vdc
to 30 Vdc.
General
The supply is protected by a 1.1 A resettable
fuse. To reset the fuse, remove the power then
identify and rectify the cause of the fault.
The nominal current when connected to an NC
unit is as follows:
NC1 300 mA @ 12 V, 130 mA @ 24 V
NC3 or NC4 120 mA @ 12 V, 70 mA @ 24 V
Alternatively the interface can be powered from a
Renishaw PSU3 power supply unit.
Input / output over-current
protection
Each of the SSR (solid state relay) outputs is
protected by a 50 mA resettable fuse.
The auxiliary relay output is protected by a
200 mA resettable fuse.
The NC3 and NC4 are protected by a resettable
current protection circuit.