Comparators - Danfoss VLT HVAC Basic Drive Programming Manual

Parameters
13-02 Stop Event
Option:
[33] Digital input DI18
[34] Digital input DI19
3 3
[35] Digital input DI27
[36] Digital input DI29
[39] Start command
[40] Drive stopped
[42] Auto reset trip
[50] Comparator 4
[51] Comparator 5
[60] Logic rule 4
[61] Logic rule 5
[70] SL Time-out 3
[71] SL Time-out 4
[72] SL Time-out 5
[73] SL Time-out 6
[74] SL Time-out 7
[83] Broken belt
13-03 Reset SLC
Option:
[0] Do not reset
*
SLC
[1] Reset SLC
52
VLT HVAC Basic Drive Programming Guide
Function:
Use the value of DI18 in the logic rule
(High = TRUE).
Use the value of DI27 in the logic rule
(High = TRUE).
Use the value of DI29 in the logic rule
(High = TRUE).
This event is TRUE if the frequency
converter is started by any means (either
via digital input, fieldbus or other).
This event is TRUE if the frequency
converter is stopped or coasted by any
means (either via digital input, fieldbus
or other).
This event is TRUE if the frequency
converter is tripped (but not trip-locked)
and an Automatic Reset is issued.
Use the result of comparator 4 in the
logic rule.
Use the result of comparator 5 in the
logic rule.
Use the result of logic rule 4 in the logic
rule.
Use the result of logic rule 5 in the logic
rule.
Use the result of timer 3 in the logic rule.
Use the result of timer 4 in the logic rule.
Use the result of timer 5 in the logic rule.
Use the result of timer 6 in the logic rule.
Use the result of timer 7 in the logic rule.
A broken belt condition has been
detected. This function must be enabled
in 22-60 Broken Belt Function.
Function:
Retains programmed settings in all group
13 parameters (13-*).
Resets all group 13 parameters (13-*) to
default settings.
MG.18.B1.02 - VLT

3.9.3 13-1* Comparators

Comparators are used for comparing continuous variables
(i.e. output frequency, output current, analog input etc.) to
fixed preset values.
Par. 13-10
Comparator Operand
Par. 13-12
Comparator Value
In addition, there are digital values that will be compared to
fixed time values. See explanation in 13-10 Comparator
Operand. Comparators are evaluated once in each scan
interval. Use the result (TRUE or FALSE) directly. All
parameters in this parameter group are array parameters
with index 0 to 5. Select index 0 to programme Comparator
0, select index 1 to programme Comparator 1, and so on.
13-10 Comparator Operand
Array [6]
Option:
[0] Disabled
*
[1] Reference
[2] Feedback
[3] Motor speed
[4] Motor current
[6] Motor power
[7] Motor voltage
[12] Analog input AI53
[13] Analog input AI54
[20] Alarm number
[30] Counter A
[31] Counter B
13-11 Comparator Operator
Array [6]
Option:
[0] Less Than (<)
[1] Approx.Equal (~) Select ≈ [1] for the result of the evaluation
*
®
is a registered Danfoss trademark
Par. 13-11
Comparator Operator
=
TRUE longer than.
. . .
. . .
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
13-10 Comparator Operand is smaller than
the fixed value in 13-12 Comparator Value.
The result will be FALSE, if the variable
selected in 13-10 Comparator Operand is
greater than the fixed value in
13-12 Comparator Value.
to be TRUE, when the variable selected in
13-10 Comparator Operand is approxi-