VLT
®
Series 3500
44
Control Panel
Local/Hand and Remote/Auto Control
The start/stop and speed reference functions of the drive
are controlled by these controls.
Local/Hand
The drive is commanded to energize the run relay and
start. Any customer remote start/stop contacts will be
overridden. The drive will also follow the local speed
reference set using the “+” and “-” keys. If parameter 003
is set for KEY HOA W.STP and parameter 404 is set to
MTR. COAST, opening the safety interlock circuit
between terminals 12 and 27 will stop the drive. While
this won’t give a fault indication at the drive, if parameter
409 is set to ENABLED noWR (enabled no warning),
relay 01 will de-energize. Then this interlock opens, just
as it does in a fault condition.
Remote/Auto
The drive is commanded to pick up the run relay and
start only if the customer remote start contact is closed.
The drive also follows the specified external speed
reference signal.
Setting H-O-A Control
In parameter 003 it is possible to choose between three
different ways of implementing the H-O-A function:
1. Control from the drive keypad.
2. Control from the drive keypad, with the ability to stop
the drive remotely.
3. Remote control.
External Selection of Local/Hand and Remote/Auto
It is possible to choose between Local/Hand or Remote/
Auto mode by means of the digital inputs.
The Local/Hand mode is activated when one of the
digital input terminals 16 (parameter 400) or terminal 19
(parameter 403) is programmed for External H-O-A
Hand, and 24 V DC from terminal 12 is applied to that
terminal.
The Remote/Auto mode is activated when digital input
terminal 17 (parameter 401) or terminal 18 (parameter
402) is programmed for External H-O-A Auto, and 24 V
DC from terminal 12 is applied to that terminal.
If no terminals are activated using the 24 V DC from termi-
nal 12, the output frequency of the drive will ramp down to
0 Hz.
External Local/Hand and Remote/Auto References
In parameter 420 it is possible to choose the reference to
be used in the External Hand mode.
There is a choice of three options:
1. Voltage reference
2. Current reference
3. Digital speed up/down
Start Signal for External Hand Mode
When Local/Hand mode is selected through terminal 16
(parameter 400) or terminal 19 (parameter 403), it is
necessary to give the drive a start command to start the
drive. Terminal 29 or 19 can be programmed to give the
required start command. If 24 V DC is connected to
terminal 19 or terminal 29 for a minimum of 20
milliseconds, the inverter starts and the drive supplies
the motor with a frequency depending on the reference.
When the 24 V DC signal is removed from terminal 16 or
19, the drive stays in Local/Hand mode, but the inverter
stops.
External Remote/Auto Mode
When Remote/Auto mode is activated through terminal
17 (parameter 401) or terminal 18 (parameter 402), the
drive will be controlled by means of normal remote
operation.