ACS 160 User’s Manual 27
Programming
Local and Remote Control
The ACS 160 drive can be in two alternative control modes:
• In remote control mode the drive is controlled externally through the digital and analogue inputs
or through serial communication. This mode is active when REM is visible on the control panel
display.
• In local control mode the drive is controlled from the keypad of the drive’s own control panel. This
mode is active when LOC is visible on the control panel display.
User can change between local and remote control modes by pressing the MENU and ENTER
buttons simultaneously.
External Control Locations
In remote control mode the drive can accept controlling commands from two alternative external
locations. These external locations are called EXT1 and EXT2. In the simplest applications the drive
always receives controlling commands from EXT1. The EXT2 control location is needed in complex
applications like PID control.
For both external control locations it is possible to define separately from which source the drive is
receiving the controlling commands (start, stop, direction and frequency reference).
For example, when controlled from external control location EXT1 the drive could receive start and
stop through digital input DI1. To make this happen, parameter 1001
EXT1 COMMANDS value must be
set to 1 (
DI1). When controlled from external control location EXT2, the drive could receive the start/
stop command through digital input DI5. Parameter 1002
EXT2 COMMANDS value must be set to 6
(
DI5).
Parameter 1102
EXT1/EXT2 SEL is used to define how the drive is switched between control locations
EXT1 and EXT2. As an example, by setting parameter 1102 to value 3 (
DI3) causes the drive to be in
EXT1 when DI3 is deactivated, and in EXT2 when DI3 is activated.
In the same way it is possible to define sources for frequency references. When external control
location EXT1 is selected external reference 1 (REF1) is used. When external control location EXT2
is selected, external reference 2 (REF2) is used. Parameters 1103
EXT REF 1 SELECT and 1106 EXT
REF 2 SELECT are used to select sources for the references. Source can e.g. be one of the analogue
inputs or serial communication. Refer to relevant parameter descriptions for more information.
Reference types
External reference 1 and 2 have their own characteristic features:
• External reference 1 (REF1) is a frequency reference providing set point for the output frequency
of the drive. This reference is always given in Hz.
• External reference 2 (REF2) is given as percentage (%). Reference 2 can be either a frequency
reference or, alternatively, process reference when PID control is used. Reference 2 is internally
converted to frequency so that 100 % corresponds to parameter 2008
MAXIMUM FREQ. However,
when PID Control macro is used reference 2 is fed directly to the PID controller as percentage.
It should be noted that also in remote control mode references 1 and 2 can be received from the
keypad if necessary. This depends on the values of parameters 1103
EXT REF1 SELECT and 1106 EXT
REF2 SELECT.
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