Danfoss VLT HVAC Series Programming Manual page 147

VLT ® HVAC Drive Programming Guide
3.13.3 13-1* Comparators
Comparators are used for comparing continuous variables (i.e., output frequency, output current, analog input, etc.) to fixed preset values. In addition,
there are digital values that will be compared to fixed time values. See explanation in par.13-10
in each scan interval. Use the result (TRUE or FALSE) directly. All parameters in this parameter group are array parameters with an index of 0 to 5. Select
index 0 to program Comparator 0, select index 1 to program Comparator 1, etc.
13-10 Comparator Operand
Array [4]
Option:
[0] * DISABLED
[1] Reference
[2] Feedback
[3] Motor speed
[4] Motor current
[5] Motor torque
[6] Motor power
[7] Motor voltage
[8] DC-link voltage
[9] Motor thermal
[10] VLT temp.
[11] Heat sink temp.
[12] Analog input AI53
[13] Analog input AI54
[14] Analog input AIFB10
[15] Analog input AIS24V
[17] Analog input AICCT
[18] Pulse input FI29
[19] Pulse input FI33
[20] Alarm number
[30] Counter A
[31] Counter B
13-11 Comparator Operator
Array [6]
Option:
[0] * <
[1] = (equal)
[2] >
Function:
Select the variable to be monitored by the comparator.
Function:
Select < [0] for the result of the evaluation to be TRUE, when the variable selected in par.
13-10 Comparator Operand is smaller than the fixed value in par.13-12
will be FALSE, if the variable selected in par.13-10
Comparator Value
value in par.13-12
Select ≈ [1] for the result of the evaluation to be TRUE, when the variable selected in par.
Comparator Operand
13-10 is approximately equal to the fixed value in par.13-12
ue .
Select > [2] for the inverse logic of option < [0].
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
3 Parameter Description
Comparator Operand
. Comparators are evaluated once
Comparator Value
Comparator Operand
.
3
. The result
is greater than the fixed
Comparator Val-
3-123