Danfoss VLT 6000 HVAC Servisní příručka stáhnout pdf (Strana 112)

VLT

6000 HVAC

112

★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port

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

■■

■ Feedback signals in open loop

Normally, feedback signals and thus feedback

parameters are only used in Closed loop operation; in

VLT 6000 HVAC units, however, the feedback

parameters are also active in Open loop operation.

In Open loop mode, the feedback parameters can be

used to show a process value in the display. If the

present temperature is to be displayed, the

temperature range can be scaled in parameters 413/

414 Minimum/Maximum feedback, and the unit (°C,

°F) in parameter 415 Process units.

413 Minimum feedback, FB

MIN

(MIN. FEEDBACK)

Value:

-999,999.999 - FB

MAX

★ 0.000

Function:

Parameters 413 Minimum feedback, FB

MIN

and 414

Maximum feedback, FB

MAX

are used to scale the

display indication, thereby ensuring that it shows the

feedback signal in a process unit proportionally to the

signal at the input.

Description of choice:

Set the value to be shown on the display at minimum

feedback signal value (par. 309, 312, 315 Min.

scaling) on the selected feedback input (parameters

308/311/314 Analogue inputs).

414 Maximum feedback, FB

MAX

(MAX. FEEDBACK)

Value:

MIN

- 999,999.999 ★ 100.000

Function:

See the description of par. 413 Minimum feedback,

MIN

Description of choice:

Set the value to be shown on the display when

maximum feedback (par. 310, 313, 316 Max. scaling)

has been achieved at the selected feedback input

(parameters 308/311/314 Analogue inputs).

415 Units relating to closed loop

(REF. / FDBK. UNIT)

Value:

No unit [0] °C [21]

★% [1] GPM [22]

rpm [2] gal/s [23]

ppm [3] gal/min [24]

pulse/s [4] gal/h [25]

l/s [5] lb/s [26]

l/min [6] lb/min [27]

l/h [7] lb/h [28]

kg/s [8] CFM [29]

kg/min [9] ft

/s [30]

kg/h [10] ft

/min [31]

/s [11] ft

/h [32]

/min [12] ft/s [33]

/h [13] in wg [34]

m/s [14] ft wg [35]

mbar [15] PSI [36]

bar [16] lb/in

[37]

Pa [17] HP [38]

kPa [18] °F [39]

mVS [19]

kW [20]

Function:

Selection of unit to be shown on the display.

This unit will be used if Reference [unit] [2] or

Feedback [unit] [3] has been selected in one of the

parameters 007-010, as well as in the Display mode.

In Closed loop, the unit is also used as a unit for

Minimum/Maximum reference and Minimum/

Maximum feedback, as well as Setpoint 1 and

Setpoint 2.

Description of choice:

Select the required unit for the reference/feedback

signal.

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 176 177

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