DriSteem Vapor-Logic Instalační příručka stáhnout pdf (Strana 9)

Electrical noise can produce undesirable effects on

the electronic control circuits that can affect controllabil-

ity. Electrical noise is generated by electrical equipment,

such as resistive loads, electric motors, solenoid coils,

welding machinery, fluorescent light circuits, etc. The

electrical noise or interference generated from these

sources (and the effects on controllers) is very difficult

to define, but most common symptoms are erratic

operation or intermittent problems.

However, most noise problems can be prevented by

using wiring practices and techniques which prevent

coupling or inducing of electrical interference into

control circuits. Some simple wiring practices associ-

ated with DRI-STEEM humidifier equipment should

minimize interaction of noise and controls:

• Humidifier and control cabinets must be

connected to a code approved earth ground.

• When routing electrical wiring inside the

control cabinet, separate the line voltage

wiring from low voltage control circuit wiring.

• Use separate electrical conduits or cable

trays for line and low voltage control wiring

from the humidifier to humidity sensors,

airflow switches, etc.

OM-

829

*Independent of Line Voltage Wiring

To Humidifier

Probe Head On

Tank

Figure 9-1: Probe Wiring

Brown (full) Probe Rod Level A

Orange (refill) Probe Rod Level B

Violet (low water) Probe Rod Level C

or DI Low Water Cut-Off Switch

Probe Wiring To

Be 1.0 mm

Stranded Wire

Run In Conduit*

Do Not Use

Shielded Cable

For Probe

Wiring.

PROPER WIRING PROCEDURES

• Do not use chassis or safety grounds as

current carrying commons. No safety

grounds should ever be used as a conductor

or neutral to return circuit current.

• The preferred method of external electrical

connections to humidistats, room/duct

humidity and temperature transmitters, and

control signal input connections from building

control systems is minimum 1.0 mm

plenum

rated wire cable of twisted pair type, includ-

ing cable shielding and drain wire for ground-

ing.

• All grounding of shielded cable connections

should be returned to the control cabinet

and tied to the protective earthing bar. Do

not ground shield at the device end.

• IMPORTANT: Locate the control cabinet

so that wire lengths are 15 metres or less

to the humidifier.

• Probe and low water cut off wiring must be

individual 1.0 mm

stranded wire run in

conduit (see figure 9-1). Do not use shielded

cable for probe wiring.

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