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model 2704 controller installation and operation handbook - Soliton

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Safety <strong>and</strong> EMC Information<br />

<strong>2704</strong> Controller<br />

+<br />

Analogue<br />

Input<br />

Digital Input<br />

Common<br />

Voltage<br />

Control<br />

Voltage<br />

Screen<br />

-<br />

220K<br />

220K<br />

100R Fuse<br />

Resistor<br />

2.5V<br />

Instrument Ground<br />

2M* Bleed<br />

Resistor<br />

Digital IO<br />

Com<br />

N<br />

L<br />

Figure B-1: Analogue Input <strong>and</strong> Fixed Digital I/O Equivalent Circuit<br />

B.3.5. Wiring<br />

It is important to connect the <strong>controller</strong> in accordance with the wiring data given in this<br />

h<strong>and</strong>book. Take particular care not to connect AC supplies to the low voltage sensor input or<br />

other low level inputs <strong>and</strong> outputs. Only use copper conductors for connections (except<br />

thermocouple inputs) <strong>and</strong> ensure that the wiring of <strong>installation</strong>s comply with all local wiring<br />

regulations. For example in the in the UK use the latest version of the IEE wiring<br />

regulations, (BS7671). In the USA use NEC Class 1 wiring methods.<br />

B.3.6. Power Isolation<br />

The <strong>installation</strong> must include a power isolating switch or circuit breaker. This device should<br />

be in close proximity to the <strong>controller</strong>, within easy reach of the operator <strong>and</strong> marked as the<br />

disconnecting device for the instrument.<br />

B.3.7. Earth leakage current<br />

Due to RFI Filtering there is an earth leakage current of less than 0.5mA. This may affect the<br />

design of an <strong>installation</strong> of multiple <strong>controller</strong>s protected by Residual Current Device, (RCD)<br />

or Ground Fault Detector, (GFD) type circuit breakers.<br />

B-4 Engineering H<strong>and</strong>book. Part No HA026502 Issue 2.0 Apr-00

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