Emerson E2 Manual do Operador descarregar pdf (Página 63)

(1/2 amp) for the accessory coils, and one fuse

(2 amp) for the contactor coil (refer to figure 6.1).

Always use a fast-blow fuse for replacement.

When replacing a module that has only one fuse on

the module (or perhaps no fuse), remove the contac-

tor coil fuse that is found in the terminal box (refer to

figure 6.2). There may also be an accessory fuse in

the side box (2D / 3D) that may be discarded.

Inspect fuses if the contactor fails to load, or if an

accessory will not activate.

A.3 Communication Wiring

• Communication wire should ideally be a

shielded, twisted pair cable such as Belden

#8641 (24 AWG) or Belden #8761 (22AWG).

• Daisy-chain per the attached diagram below,

setting all 3 jumpers to the proper position.

• Do not route the communication wire through

hi-voltage conduit, in close proximity to con-

tactors or parallel to high current wires.

• The maximum recommenced length for com-

munication wires is 4000 ft for 18 to 22 AWG

or 2500 ft for 24A WG.

Figure A.3 Compressor Communications Wiring

Appendix B

Demand Cooling Temperature Comparison

Refer to section 5.1 for a more detailed description of

liquid injection operation.

The table below gives comparison temperature read-

ings for Intelligent Store™ Discus® vs. values for con-

ventional Demand Cooling. Note that the 2D and 3D

temperatures are significantly lower than for standard

demand cooling (D.C.). This is to compensate for the

probe location used on the Intelligent Store™

Discus®. The actual peak gas temperatures inside

the head are correspondingly higher and will be at the

standard demand cooling levels during injection start,

injection stop and at the maximum trip temperature.

When reading head temperatures from Intelligent

Store™ Discus® 2D and 3D compressors, add

approximately 25°F to 30°F for a comparison to com-

pressors with a probe mounted in the front corner of

the head.

Figure B.1 Comparison Temperature Readings

Head Probe

Location

Standard ISD & Standard

Head Temperature (°F)

Standard

Demand

Cooling

2D/3D

ISD

Maximum (Trip)

Reset

Liquid Injection Start

Liquid Injection Stop

310

292

282

280

250

266

264

310

268

292

282

ISD

AE8-1337 R1

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 69 70 71

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