Mentor ll User Guide 43
Issue Number: 12 www.controltechniques.com
Menu 02: Ramps
The principal alternatives available for setting ramps are as follows -
1. No ramps at all, bypassing the ramp functions.
2. A selection of forward and reverse ramps for normal run conditions
and an optional separate ramp for inching.
The arrangement for selecting running ramps affords the maximum
flexibility. There are two possible ramp values available for each mode of
operation, eg forward accelerations 1 and 2, forward decelerations 1 and
2, and so on. A common ramp selector allows switching between the two
groups (all the 1s or all the 2s). In addition it is possible to change ramps
1 and 2 of any quadrant within the common selection. Ramp selectors
may be controlled by any of the programmable digital inputs.
To activate the inch ramp, a select signal is required from 01.13 in
addition to the enable function 02.13.
The ramp operation can be interrupted by the ramp hold parameter,
which holds the ramp output at its present value when set to 1. Ramp
disable over-rides this feature.
The value of the speed reference signal after the ramp is monitored by
the post-ramp reference.
Monitors the value of the speed reference after it has bypassed or been
modified by the ramp selected.
If set to disable, makes the post-ramp speed reference 02.01 equal to
the pre-ramp speed reference 01.03, effectively bypassing the ramp
functions.
Holds the ramp output at its present value when set to 1. By using a
programmable input to control this parameter, the speed of the Drive
may be controlled from 'increase' and 'decrease' pushbuttons instead of
a potentiometer or other continuously-variable reference source. Ramp
disable over-rides this feature.
Defines the time taken to accelerate from rest to maximum full-scale
speed (01.03 = 1000), or to decelerate from this speed to rest, as
appropriate.
Alternative acceleration and deceleration ramp rates.
Defines the rate of acceleration and deceleration when the Inch
Reference is selected (01.13 =1).
To select, 02.13 =1.
Selects a dedicated ramp rate (defined by 02.12) when inching. If not
selected, the normal ramps 02.04 through to 02.11 areusedforinching
as well as running.
Select from Group 1 or 2
These selectors allow ramps to be chosen from either of the two groups
at will, permitting individual acceleration and/or deceleration rates to be
changed on receipt of an appropriate command.
Enables selection between all ramps of Group 1 if 02.14 to 02.17 =0,or
all of Group 2.
When 02.19 = 1, acceleration & deceleration ramp time multiplies by 10.
02.01 Post-ramp reference
R0 Bi
ô
±1000
ð
02.02 Ramp enable
RW Bit
ô
1
ð
enabled
02.03 Ramp hold
RW Bit
ô ð
0
02.04 Forward acceleration 1
02.05 Forward deceleration 1
02.06 Reverse deceleration 1
02.07 Reverse acceleration 1
RW Uni
ô
0~1999
ð
+050 = 5s 0.1s
02.08 Forward acceleration 2
02.09 Forward deceleration 2
02.10 Reverse deceleration 2
02.11 Reverse acceleration 2
RW Uni
ô
0~1999
ð
+100 = 10s 0.1s
02.12 Inch ramp rate
RW Uni
ô
0~1999
ð
+100 = 10s 0.1s
02.13 Enable inch ramp
RW Bit
ô
0or1
ð
0, disabled
02.14 Forward acceleration selector
02.15 Forward deceleration selector
02.16 Reverse deceleration selector
02.17 Reverse acceleration selector
RW Bit
ô
0or1
ð
0, Ramp 1
02.18 Common ramp selector
RW Bit
ô
0or1
ð
0, Group 1
02.19 Ramp scaling (x10)
RW Bit
ô
0or1
ð
0, disabled
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