Lenze 8400 - Manual (Page 1257)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
1257
18 Function library
18.1 Function blocks | L_DFRFG_1
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
• The acceleration or deceleration in the synchronous point results from the
acceleration/deceleration time set in C01076/1 .
• Reference for the acceleration/deceleration time is the reference speed ( C00011 ):
[18-27] Connection between acceleration time and acceleration
• Based on the input speed of the master axis, a setpoint angle is calculated from the starting
time onwards which leads the actual angle of the slave.
• Dependent on the master speed and the settings for acceleration and offset, the FB may travel
oversynchronously for reducing the angular difference, i.e. nOut_v is higher than nIn_v:
[18-28] Speed/time diagram
 C00011 : Reference speed
 C01076/1 : Acceleration/deceleration
time
 Effective target speed
 Required time
v
Œ
t

0
1
v
Œ
t

0
1
 C01077/1 : Maximum speed
 Identical surface below the speed profile that represents the covered path.
nOut_v
nIn_v
t
nIn_v
t
Œ
0
0

Note!
• Set the maximum speed in C01077/1 higher than the master speed to be expected.
The speed is selected on the motor side and is independent of the reference speed
( C00011 ). The higher the difference between maximum speed and master speed, the
less time to the synchronous time is required.
• In case of a heavily oscillating input speed it may occur that directly after setting the
bSync status signal to TRUE the FB still executes slight angle corrections.
• Generally avoid acceleration or deceleration processes of the master axis while the
slave axes are synchronising.