Danfoss VLT HVAC Drive FC 100 Series Programming Manual Download Page 49

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Digital input
function

Description

[17] Preset ref bit 1

Enables a choice between one of the
eight preset references according to

Table 3.5

[18] Preset ref bit 2

Enables a choice between one of the
eight preset references according to

Table 3.5

[19] Freeze reference Freeze actual reference. The frozen

reference is now the point of enable/
condition for Speed up and Slow to be
used. If Speed up/down is used, speed
change always follows ramp 2 (

and

) in the range

3-03 Maximum Reference

[20] Freeze output

Freezes actual reference. The frozen
reference is now the point of enable/
condition for Speed up and Slow to be
used. If Speed up/down is used, the
speed change always follows ramp 2.

[21] Speed up

For digital control of the up/down speed
is desired (motor potentiometer). Activate
this function by selecting either Freeze
reference or Freeze output. When Speed
up is activated for less than 400 msec. the
resulting reference will be increased by
0.1%. If Speed up is activated for more
than 400 msec., the resulting reference
will ramp according to Ramp 1 in

3-41 Ramp 1 Ramp Up Time

[22] Slow

Same as

[21] Speed up

, but reference

decreases.

[23] Set-up select bit
0

Selects one of the two set-ups. Set

0-10 Active Set-up

to Multi Set-up.

[34] Ramp bit 0

Select which ramp to use. Logic “0” will
select ramp 1 while logic “1” will select
ramp 2.

[37] Fire mode

A signal applied will put the adjustable
frequency drive into Fire Mode and all
other commands will be disregarded. See
24-0*

Fire Mode

Digital input
function

Description

[52] Run permissive

The input terminal, for which the Run
permissive has been programmed must
be logic “1” before a start command can
be accepted. Run permissive has a logic
‘AND’ function related to the terminal
which is programmed for

[8] Start

[14] Jog

[20] Freeze Output

, which means that in

order to start running the motor, both
conditions must be fulfilled. If Run
permissive is programmed on multiple
terminals, Run permissive needs only be
logic ‘1’ on one of the terminals for the
function to be carried out. The digital
output signal for Run Request (

[8] Start

[14] Jog

[20] Freeze Output

)

programmed in par. 5-3*, or par. 5-4*, will
not be affected by Run Permissive.

NOTE!

If no Run permissive signal is applied
but either Run, Jog or Freeze
commands is activated, the status
line in the display will show either
Run Requested, Jog Requested or
Freeze Requested.

[53] Hand Start

A signal applied will put the adjustable
frequency drive into Hand mode as if
[Hand On] has been pressed and a normal
stop command will be overridden. If
disconnecting the signal, the motor will
stop. To make any other start commands
valid, another digital input must be
assigned to

Auto-Start

and a signal

applied to this. The [Hand On] and [Auto
On] keys have no impact. The [Off] key
will override

Hand Start

and

Auto Start

Press either the [Hand On] or [Auto On]
key to make

Hand Start

and

Auto Start

active again. If no signal on either

Hand