Parameter listing and descriptions
189
ACH550-01 User's Manual
1103
REF1 SELECT
0…17
Selects the signal source for external reference
REF
1.
0 =
KEYPAD
– Defines the control panel as the reference source.
1 =
AI
1 – Defines analogue input 1 (
AI
1) as the reference source.
2 =
AI
2 – Defines analogue input 2 (
AI
2) as the reference source.
3 =
AI
1/
JOYST
– Defines analogue input 1 (
AI
1), configured for joystick
operation, as the reference source.
• The minimum input signal runs the drive at the maximum reference
in the reverse direction. Define the minimum using parameter 1104.
• The maximum input signal runs the drive at maximum reference in
the forward direction. Define the maximum using parameter 1105.
• Requires parameter 1003 = 3 (
REQUEST
).
WARNING!
Because the low end of the reference range commands
full reverse operation, do not use 0 V as the lower end of the
reference range. Doing so means that if the control signal is lost
(which is a 0 V input), the result is full reverse operation. Instead,
use the following set-up so that loss of the analogue input triggers a
fault, stopping the drive:
• Set parameter 1301
MINIMUM
AI
1 (1304
MINIMUM
AI
2) at 20% (2 V or
4 mA).
• Set parameter 3021
AI
1
FAULT
LIMIT
to a value 5% or higher.
• Set parameter 3001
AI
<
MIN
FUNCTION
to 1 (
FAULT
).
Code Description
Range
+2 %
-2 %
10 V /
Hysteresis 4 % of full scale
EXT
REF
1
MIN
-
EXT
REF
1
MIN
-
EXT
REF
1
MAX
EXT
REF
1
MIN
EXT
REF
1
MAX
-
EXT
REF
1
MIN
2 V / 4 mA
0 V / 0 mA
20 mA
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