Emerson 2468CD 2.1INTRODUCTION, 2.2ELECTRODE CABLING SYSTEM, 2.3ELECTRONIC ENCLOSURE, Number of

Hydrastep 2468CB and 2468CD Manual 2468CB & 2468CD Dual Power Supply Version

2.1INTRODUCTION

This chapter introduces the dual power supply version of the Hydrastep 2468 Electronic Gauging System, its mechanical installation, system configuration, simple fault analysis/corrective action capability and its specification.

2.2ELECTRODE CABLING SYSTEM

This system can have 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 or 32 electrodes and uses 18-core electrode cables. The cables consist of nine pairs of coloured cores with the black cores in each cable used for the EARTH terminations. Each electrode requires one pair of cores, one core for the signal drive and one for the signal return.

Number of	Number of Cables
Electrodes	Required
8	1
10-16	2
18-24	3 or 4
26-32	4

The electrode cable is pre-formed for simple installation. The connections to the electrodes are terminated on the connection stud of the electrode. Either core can be connected to the electronic enclosure as the signal drive or return.

2.3ELECTRONIC ENCLOSURE

The basic arrangement of boards in the electronic enclosure is as follows:

∙Two input boards supply power to the system and to the input signal processing circuits. These boards are: PCB 24680501, ac (mains) input, or PCB 24680516, dc input. One board is mounted on the right hand side of the base plate and receives the odd numbered electrode inputs. The other board is mounted on the left hand side of the base plate and receives the even numbered electrode inputs.

∙A display board (PCB 24680515) contains the LED drive circuits for the two columns (32 red LEDs and 32 green LEDs) and the system fault LEDs. This board is mounted on the rear of the front panel, with the LEDs protruding through the front panel.

∙Up to four output boards, Relay Board (PCB 24680504), Relay with time delay Board (24680509) or Opto-isolator Board (PCB 24680505) may be fitted, two per input board. Output board mounting pillars are fitted to each input board during manufacture to support the first output board mounted.

Refer to Figure 2.1 on page 2-4 for an annotated view of the internal layout of the unit.

24685034 2-3