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6-76
Programming Your Application
590+ Series DC Digital Converter
SPEED LOOP (ADVANCED)
Contains parameters for the advanced user.
These parameters change the proportional and
integral profiles, and can disable SCR/thyristor
firing when the drive is stopped.
The ADVANCED function block is viewed in two
sub-menus on the MMI : ADAPTION and ZERO
SPD. QUENCH.
For details of the third MMI sub-menu, INERTIA
COMP, refer to page 6-40.
The input to the ADVANCED block is RAMPING from the RAMPS function block.
Inputs for ADAPTION are PROP. GAIN and INT. TIME CONST. from the SPEED LOOP
function block. Its outputs are profiled proportional and integral gains for the speed loop.
Inputs for ZERO SPD. QUENCH are SPEED DEMAND (STOP RATES function block),
SPEED FEEDBACK (SPEED LOOP function block) and CURRENT DEMAND
(DIAGNOSTICS function block).
ADAPTION : MMI Sub-Menu
This menu allows you to profile the drive's speed loop proportional and integral gains to
certain drive parameters. The gains change when the motor speed feedback reaches the
thresholds set by SPD BRK 1 (LOW) and SPD BRK 2 (HIGH).
x
At or below SPD BRK 1 (LOW), the speed loop uses the PROP. GAIN and INT. TIME
CONST. values in ADAPTION as its PI loop gains.
x
Between SPD BRK 1 (LOW) and SPD BRK 2 (HIGH), profiling occurs and the speed
loop gains are determined by another parameter value (according to the selection of the
MODE parameter).
x
Above SPD BRK 2 (HIGH), the PROP. GAIN and INT. TIME CONST. settings in the
SPEED LOOP function block are used.
MODE selects the parameter for profiling the speed loop PI gains when the motor speed is
between the two speed breakpoints.
ZERO SPD. QUENCH : MMI Sub-Menu
When ZERO SPD. QUENCH is TRUE, the current loop is disabled when SPEED DEMAND,
SPEED FEEDBACK and CURRENT DEMAND have all dropped to the threshold levels set
by ZERO SPD. LEVEL and ZERO IAD LEVEL.
This is similar to Standstill logic (it stops making current but the contactor stays energised)
except that the speed loop remains enabled and this will cause the current loop to unquench
very quickly.
Advanced
0
–
[268] MODE
1.00 %
–
[269] SPD BRK 1 (LOW)
5.00 %
–
[270] SPD BRK 2 (HIGH)
5.00
–
[271] PROP. GAIN
0.500 s
–
[272] INT. TIME CONST.
1.0000
–
[274] I GAIN IN RAMP
0.00 %
–
[273] POS. LOOP P GAIN
0.50 %
–
[284] ZERO SPD. LEVEL
1.50 %
–
[285] ZERO IAD LEVEL
MMI Menu Map
1
SETUP PARAMETERS
2
SPEED LOOP
3
ADVANCED
I GAIN IN RAMP
MMI Menu Map
1
SETUP PARAMETERS
2
SPEED LOOP
3
ADVANCED
4
ADAPTION
MODE
SPD BRK 1 (LOW)
SPD BRK 2 (HIGH)
PROP. GAIN
SPD. INT. TIME
MMI Menu Map
1
SETUP PARAMETERS
2
SPEED LOOP
3
ADVANCED
4
ZERO SPD. QUENCH
ZERO SPD. LEVEL
ZERO IAD LEVEL