60
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
The "Auto" mode is activated when one of the digital
input terminals 17 (parameter 401) or 18 (parameter
402) is programmed for External H-O-A Auto, and 24 V
DC is connected (terminal 12).
If no terminals are activated using 24 V DC (terminal
12), the output frequency of the frequency converter
will follow the ramp down to 0 Hz.
External H-O-A reference
In parameter 420 it is possible to choose the refe-
rence to be used in the External Hand Mode.
There is a choice of 3 options:
1.
Voltage reference V
2.
Current reference mA
3.
Digital speed up/down
Start signal for External Hand Mode
When "Hand" Mode is activated via terminal 16 (para-
meter 400) or 19 (parameter 403), it is necessary to
give the frequency converter a start signal to start up
the inverter.
Terminal 29 or 19 can be programmed to Pulse start
Hand. If 24 V DC is connected to terminal 29 or 19 for
min. 20 milliseconds, the inverter starts and the fre-
quency converter supplies the motor with a frequency
determined by the reference.
When the 24 V DC signal is removed from terminal 16
or 19, the frequency converter stays in "Hand" Mode,
but the inverter stops.
Auto Mode
When "Auto" Mode is activated via terminal 17 (para-
meter 401) or 18 (parameter 402), the frequency con-
verter will be controlled by means of normal remote
operation.
Cross reference for terminals/parameter functions (see also pages 60-69)
★
★
★
★
★
=
Factory setting
*)
Must be carried out with the break-before-make contact function (NC), since this function is
activated at 0 V on the input
**)
To be connected to terminal 50 (10 V DC) and terminal 16 (parameter 400), with choice of
thermistor function
Terminal 16 / Par.400
★
Reset
Stop *)
Freeze ref.
Thermistor **)
Extern H-O-A Hand
Set-up select
Terminal 17 / Par.401
Reset
Stop *)
★
Freeze ref.
Pulse 100 Hz
Pulse 1kHz
Pulse 10 kHz
Ex H-O-A Auto
Terminal 18 / Par.402
★
Start
Latch start
No operation
Extern H-O-A Auto
Terminal 19 / Par.403
★
Reversing
Start rev.
No operation
Extern H-O-A Hand
Pulse Start Hand
Terminal 27 / Par.404
★
Mtr. coast *)
Q-stop *)
DC-brake *)
Reset and coast *)
Stop *)
Terminal 29 / Par.405
★
Jog
Jog freeze
Freeze ref.
Digital ref.
Ramp select
Pulse Start Hand
Terminal 32 / Par.406
Set-up select
★
4 Set-up ext.
Terminal 33 / Par.406
Speed
select
Speed up
Speed down
Hand-Off-Auto, H-O-A
In the section on Local Operation using the operating
panel of the frequency converter it is possible to
choose where the H-O-A function is to be active. See
example 9, page 32.
Hand
"Hand" is a function in which manual control has first
priority.
Off
"Off" is a function in which the inverter of the fre-
quency converter has stopped.
Auto
"Auto" is a function in which normal operation is ef-
fected via the control terminals of the frequency con-
verter or the RS 485 port.
Where is the H-O-A function to be active?
In parameter 003 it is possible to choose between 3
different ways of implementing the H-O-A function:
1.
H-O-A via the operating panel of the frequency
converter.
2.
H-O-A via the operating panel with external stop.
3.
External H-O-A.
H-O-A desired externally from VLT 3500 HVAC
Via the digital inputs, it is possible to choose between
"Hand" or "Auto" Mode.
The "Hand" mode is activated when one of the digital
input terminals 16 (parameter 400) or 19 (parameter
403) is programmed for External H-O-A Hand, and 24 V
DC is connected (terminal 12).
3.8 Parameter gr
oup 4
■
Digital inputs
■
Inputs and outputs, group 4..
Group 4 is used to programme a set-up of the
connection terminals other than the standard set-up.
See the layout of digital input signals below.
■
The analogue output signals and the relays can be
used for different types of indication. See parameters
407-410. For layout of digital input signals see
following cross reference.
