Eurotherm 590+ Series, Product Manual, Page: 174 / 308

6-64
Programming Your Application
590+ Series DC Digital Converter
STANDSTILL
Standstill logic is used to inhibit rotation
when operating with Zero Speed demand.
If the drive is below the Zero Speed
threshold and Standstill logic is enabled,
then the speed and current loops are
quenched. This prevents shaft oscillation
around zero speed.
It is useful in preventing gearbox wear due to “chattering”.
Functional Description
Standstill Logic inhibits the
controller at zero setpoint and
zero speed, i.e. at standstill.
The main contactor remains in
and the Run LED remains ON.
11 STANDSTILL LOGIC DISABLED
12 ZERO THRESHOLD 2.00%
SPEED
FEEDBACK
FROM
SPEED LOOP
SPEED
SETPOINT
FROM
SETPOINT
STANDSTILL
TAG# PARAMETER
DEFAULT
SETTING
78
77
79
AT ZERO SPEED
D:14
D:12
AT ZERO SETPOINT D:13
AT STANDSTILL
TO
DRIVE ENABLE
DIGITAL O/P1
B5
( DEFAULT
CONFIGURATION )
Standstill
–
AT ZERO SETPOINT [ 78]
–
FALSE
–
AT ZERO SPEED [ 77]
–
FALSE
–
AT STANDSTILL [ 79]
–
FALSE
89
–
[306] ZERO SETPOINT
–
DISABLED
–
[ 11] STANDSTILL LOGIC
–
2.00 %
–
[ 12] ZERO THRESHOLD
–
MMI Menu Map
1
SETUP PARAMETERS
2
STANDSTILL
STANDSTILL LOGIC
ZERO THRESHOLD
SOURCE TAG
Parameter Descriptions
AT ZERO SETPOINT Range: See below
Refer to the DIAGNOSTICS function block description, page 6-22.
0 : FALSE
1 : TRUE
AT ZERO SPEED Range: Same as tag 42
Refer to the DIAGNOSTICS function block description, page 6-22.
0 : FALSE
1 : TRUE
AT STANDSTILL Range: Same as tag 42
Refer to the DIAGNOSTICS function block description, page 6-22.
0 : FALSE
1 : TRUE
ZERO SETPOINT Range: 0 to 549
(SOURCE TAG)
Reserved parameter for use by Eurotherm Drives.
STANDSTILL LOGIC Range: Same as tag 4
If TRUE, the Converter is quenched (although the contactor remains in) when the Speed
Feedback and Speed Setpoint values are less than ZERO THRESHOLD.
0 : DISABLED
1 : ENABLED
ZERO THRESHOLD Range: 0.00 to 100.00 %
Threshold level which defines zero setpoint and zero speed diagnostic outputs and also
controls the zero speed relay output.
0%
STANDSTILL LOGIC ENABLED
0%
SPEED SETPOINT
SPEED FEEDBACK
ZERO THRESHOLD
(DEFAULT 2.00%)
CURVE DEPENDS ON LOAD
CHARACERISTICS
0%
DRIVE ENABLE OUTPUT
t
t
t