High-country-tek HFS-2Q Manual de usuario descargar pdf (Pagina 30)

Hydraulic Fan System Controller : HFS - 2

Fan ‘Reverse’ profile ( reverse acting control valve ):

Fan speed Profile.

Controller Output

profile to inverting type

pressure control valve.

9

11

6

1

12

7

2

4

8

3

10

14

13

5

Reverse output to

directional valve.

Normal ‘Forward’ running fan

speed determined by controller.

1

Fan at maximum speed for

Reverse time period set in

8

speed

determined

by

controller.

Manual or automatic ‘Purge’ or

reverse fan trigger detected here.

2

Fan speed decays to zero at

‘Ramp Down’ rate set in

software.

3

‘Purge’ timing cycle expired, ramp

fan to zero at ‘Ramp Down’ rate

set in software.

9

Reverse

time

period

set

in

software. This speed may be less

than forward to protect fan.

‘

Dwell

’

timer started to allow fan

10

software.

‘Dwell’ timer started to allow fan

inertia to fully dissipate and fan

stop.

4

Reverse output turned ON to

ener

g

ize directional valve.

5

Dwell

timer

started

to

allow

fan

inertia to fully dissipate and fan

stop.

Reverse output turned OFF to

de-energize directional valve.

11

Output signal to proportional

12

g

Fan rotation increased to

7

Output signal to proportional

valve started fixed mS after

reverse valve signal to prevent

hydraulic ‘lock’

6

valve started fixed mS after

reverse valve signal to prevent

hydraulic ‘lock’

Fan rotation increased to

‘Forward’ running speed

determined by user setting at

‘

Ramp Up

’

rate set in software.

13

30

‘Reverse’ running speed

determined by user setting at

‘Ramp Up’ rate set in software.

Ramp

Up

rate

set

in

software.

Normal ‘Forward’ running fan

speed determined by controller.

14

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