Danfoss VLT 6000 HVAC Manual de servicio descargar pdf (Pagina 156)

VLT

6000 HVAC

156

MG.60.B1.02 - VLT is a registered Danfoss trade mark

■■

■ Aggressive environments

In common with all electronic equipment, a VLT

frequency converter contains a large number of

mechanical and electronic components, all of which

are vulnerable to environmental effects to some

extent.

The VLT frequency converter should

not therefore be installed in environ-

ments with airborne liquids, particles or

gases capable of affecting and damaging the elec-

tronic components. Failure to take the necessary

protective measures increases the risk of stoppages,

thus reducing the life of the VLT frequency converter.

Liquids can be carried through the air and condense

in the VLT frequency converter. In addition to this,

liquids may cause corrosion of components and

metal parts.

Steam, oil and salt water may cause corrosion of

components and metal parts.

In such environments, equipment with enclosure

rating IP 54 is recommended.

Airborne

particles such as dust particles may cause

mechanical, electrical or thermal failure in the VLT

frequency converter.

A typical indicator of excessive levels of airborne

particles is dust particles around the VLT frequency

converter fan.

In very dusty environments, equipment with

enclosure rating IP 54 or a cabinet for IP 00/20

equipment is recommended.

■■

■ Calculation of resulting reference

The calculation made below gives the resulting

reference when parameter 210 Reference type is

programmed for Sum [0] and Relative [1], respectively.

External reference is the sum of references from

terminals 53, 54, 60 and serial communication. The

sum of these can never exceed parameter 205 Max.

reference.

External reference can be calculated as follows:

Res. ref. =

(Par. 205 Max. ref. - Par. 204 Min. ref.) x Par. 211-214 Preset ref.

+ External ref. + Par. 204 Min. ref. + Par. 418/419 Setpoint

100

External reference x Par. 211-214 Preset ref.

Par. 210 Reference type is programmed = Sum [0].

Ext. ref. =

Par. 310 Term. 53 Max. scaling - Par. 309 Term. 53 Min. scaling

(Par. 205 Max. ref. - Par. 204 Min. ref.) x Ana. signal

Term.

53 [V]

Par. 313 Term. 54 Max. scaling - Par. 312 Term. 54 Min. scaling

(Par. 205 Max. ref. - Par. 204 Min. ref.) x Ana. signal

Term.

54 [V]

Par. 316 Term. 60 Max. scaling - Par. 315 Term. 60 Min. scaling

(Par. 205 Max. ref. - Par. 204 Min. ref.) x Par. 314

Term.

60 [mA]

serial com. reference x (Par. 205 Max. ref. - Par. 204 Min. ref.)

16384 (4000 Hex)

Par. 210 Reference type is programmed = Relative [1].

+ Par. 204 Min. ref. + Par. 418/419 Setpoint (only in closed loop)

Res. ref. =

100

(only in closed loop)

In environments with high temperatures and humidity,

corrosive gases such as sulphur, nitrogen and

chlorine compounds will cause chemical processes

on the VLT frequency converter components. Such

chemical reactions will rapidly affect and damage the

electronic components.

In such environments, it is recommended that

equipment is mounted in a cabinet with fresh air

ventilation, keeping aggressive gases away from the

VLT frequency converter.

NOTE!

Mounting VLT frequency converters in

aggressive environments will increase the

risk of stoppages and furthermore considerably

reduce the life of the converter.

Before the installation of the VLT frequency converter,

the ambient air should be checked for liquids,

particles and gases. This may be done by observing

existing installations in this environment. Typical

indicators of harmful airborne liquids are water or oil

on metal parts, or corrosion of metal parts.

Excessive dust particle levels are often found on

installation cabinets and existing electrical

installations.

One indicator of aggressive airborne gases is

blackening of copper rails and cable ends on existing

installations.

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Danfoss VLT 6000 HVAC Manual de servicio Pagina 156

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