ABB ACS310, User Manual

Page: 141 / 376

Program features 141

Settings

Diagnostics

Example
In the following example, four drives are set up for a duty/assist cycle with internal
setpoints (parameters
4011 , 4036 , 4037 and 4038 ). As shown in the table below, at
each setpoint, a different drive has the highest setpoint value, the second highest
value, and so on, enabling a duty cycle between the four drives.
When the drive system is powered up and the pressure is below all setpoint values,
each drive keeps running until it reaches its setpoint. The drive with the highest
setpoint value keeps running even after this point and becomes the duty drive which
maintains the pressure at the desired value. The drive remains the duty drive until a
setpoint change occurs. Using a timer and a digital inputs as the source for setpoint
selection, setpoints can automatically be rotated, for example, once per day.
If the pressure in the system falls below the second highest setpoint value, that drive
assists to increase the pressure.
To enable the internal setpoints, set 4010 SET POINT SEL to INTERNAL.
Parameter Additional information
1101 Local control mode reference type selection
1102 EXT1 / EXT2 selection
1106 PID1 activation
1107 REF2 minimum limit
1501 PID2 output (external controller) connection to AO
9902 PID control macro selection
Groups 40 PROCESS PID SET
1 … 41 PROCESS PID SET 2
PID1 settings
Group 42 EXT / TRIM PID PID2 settings
Actual signal
Additional information
0126 / 0127 PID 1/2 output value
0128 / 0129 PID 1/2 setpoint value
0130 / 0131 PID 1/2 feedback value
0132 / 0133 PID 1/2 deviation
Drive number Setpoint 1
( 4011 )
Setpoint 2
( 4036 )
Setpoint 3
( 4037 )
Setpoint 4
( 4038 )
1 50% 40% 35% 30%
2 40% 35% 30% 50%
3 35% 30% 50% 40%
4 30% 50% 40% 35%
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