Danfoss VLT Programming Manual page 60

Parameter Description
Reference. (For closed loop see
20-14 Maximum Reference/Feedb.).
[20] Freeze output Freezes actual motor frequency (Hz). The
frozen motor frequency is now the point of
enable/condition for Speed up and Speed
down to be used. If Speed up/down is used,
the speed change always follows ramp 2
(3-51 Ramp 2 Ramp Up Time and 3-52 Ramp 2
Ramp Down Time) in the range 0 - 1-23 Motor
Frequency.
NOTE
When Freeze output is active, the
frequency converter cannot be stopped
via a low 'start [13]' signal. Stop the
frequency converter via a terminal
programmed for Coasting inverse [2] or
Coast and reset, inverse [3].
[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] Speed down Same as Speed up [21].
[23] Set-up select Selects one of the four set-ups. Set par. 0-10
bit 0 to Multi Set-up.
[24] Set-up select Same as Set-up select bit 0 [23].
bit 1 (Default Digital input 32)
[32] Pulse input Select Pulse input when using a pulse
sequence as either reference or feedback.
Scaling is done in parameter group 5-5*.
[34] Ramp bit 0 Select which ramp to use. Logic "0" will select
ramp 1 while logic "1" will select ramp 2.
[36] Mains failure Select to activate function selected in
inverse 14-10 Mains Failure. Mains failure is active in
the Logic "0" situation.
[37] Fire mode A signal applied will put the frequency
converter into Fire Mode and all other
commands will be disregarded. See 24-0*
Fire Mode.
[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 START [8], Jog [14] or Freeze
Output [20], 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
®
VLT HVAC Drive Programming Guide
[53] Hand start
[54] Auto start
[55] DigiPot
[56] DigiPot
[57] DigiPot Clear
[60] Counter A (up) (Terminal 29 or 33 only) Input for increment
[61] Counter A
[62] Reset Counter
[63] Counter B (up) (Terminal 29 and 33 only) Input for
[64] Counter B
[65] Reset Counter
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
Request (Start [8], Jog [14] or Freeze output
[20]) 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.
A signal applied will put the frequency
converter into Hand mode as if button Hand
On on the LCP 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 assign to Auto
Start and a signal applied to this. The Hand
On and Auto On buttons on the LCP has no
impact. The Off button on the LCP will
override Hand Start and Auto Start. Press
either the Hand On or Auto On button to
make Hand Start and Auto Start active again.
If no signal on neither Hand Start nor Auto
Start, the motor will stop regardless of any
normal Start command applied. If signal
applied to both Hand Start and Auto Start,
the function will be Auto Start. If pressing the
Off button on the LCP the motor will stop
regardless of signals on Hand Start and Auto
Start.
A signal applied will put the frequency
converter into Auto mode as if the LCP
button Auto On has been pressed. See also
Hand Start [53]
Uses the input as an INCREASE signal to the
Increase Digital Potentiometer function described in
parameter group 3-9*
Uses the input as a DECREASE signal to the
Decrease Digital Potentiometer function described in
parameter group 3-9*
Uses the input to CLEAR the Digital Potenti-
ometer reference described in parameter
group 3-9*
counting in the SLC counter.
(Terminal 29 or 33 only) Input for decrement
(down) counting in the SLC counter.
Input for reset of counter A.
A
increment counting in the SLC counter.
(Terminal 29 and 33 only) Input for
(down) decrement counting in the SLC counter.
Input for reset of counter B.
B
3 3
59