ABB ACH550-02-645A-4 [195/454] Ach550 02 user s manual

ABB ACH550-02-645A-4 [195/454] Ach550 02 user s manual
Parameter listing and descriptions 191
ACH550-02 User's Manual
1103 REF1 SELECT 0…17
Selects the signal source for external reference
REF1.
0 =
KEYPAD – Defines the control panel as the reference source.
1 =
AI1 – Defines analogue input 1 (AI1) as the reference source.
2 =
AI2 – Defines analogue input 2 (AI2) as the reference source.
3 =
AI1/JOYST – Defines analogue input 1 (AI1), 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 AI1 (1304 MINIMUM AI2) at 20% (2 V or
4 mA).
• Set parameter 3021
AI1 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
2V / 4mA
0V / 0mA
20 mA

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