Positioning and control functions
Process velocity [SPEED]
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8.4.3 Process velocity [SPEED]
Process velocity as % of nominal velocity
(Nominal velocity
≡
nominal speed * travel per motor rotation).
♦
valid until a new value is programmed.
When in
speed control mode
, direction of rotation is specified by the prefix.
SPEED value
Value: 0.0000001...100%
15
, a control parameter (P40..P49) or a variable
(V1..V39) e.g. SPEED .P40
Smallest steps = 0.002384min
-1
N005: SPEED 70 sets velocity to 70% of nominal speed.
The set velocity can be reduced using the analogue overrride input (X11.6)
(see start-up manual).
8.4.4 Acceleration and braking time [ACCEL]
Specification for acceleration and braking time .
♦
without prefix: time specification for acceleration and decceleration process.
♦
negative prefix: separate time specification for decceleration process.
♦
valid until a new value is programmed.
♦
Acceleration process can be specified using parameter P94 (see Page 75).
♦
If a travel command is interrupted by STOP or BREAK, the STOP / BREAK – ramp
is not executed by ACCEL- but by the value defined as the acceleration time.
ACCEL value
Value: 10...65 000 ms, a control parameter (P40..P49) or a variable (V1..V39) e.g.
ACCEL .P40 (timescale = 10 ms)
The negative prefix for the decceleration time specification must be set
before the control parameters e.g.: ACCEL- .P40 (P40 > 0)
The time specified in ms applies for nominal velocity
(100%). The actual time is proportional to the velocity
selected. Meaning:
ACCEL
%
100
SPEED
ta
=
N005: ACCEL 300
sets the acceleration and deceleration ramp to 300 ms
N006: ACCEL -200 sets the deceleration ramp to 200 (
≡
200 ms when
SPEED=100%)
15
For asynchronous motors, up to a max. of 300%.
SPEED
Syntax:
Example:
ACCEL
ACCEL-
Note:
Syntax:
Example:
40%
SPEED
100%
ta
ACCEL
