Moeller DF51 - Controller Inhibit and Coasting (Free Run Stop - FRS)

10/05 AWB8230-1541GB
Motor control
79
Controller inhibit and coasting (free run stop – FRS)
If you activate the digital input configured as FRS, the motor is
switched off and coasts to a stop (for example if an Emergency-
Stop is made). If you deactivate the FRS input, then, depending on
the inverter’s configuration, the frequency output is either
synchronized to the current speed of the coasting motor or restarts
at 0 Hz.
X Use PNU b088 to specify whether the motor is to restart at 0 Hz
after the FRS input has been deactivated, or if synchronization
to the current motor speed should take place after a waiting
time specified under PNU b003.
X Configure one of the digital inputs 1 to 5 as FRS by entering the
value 11 under the corresponding PNU (C001 to C005).
Figure 78: Configuration of digital input 3 as “controller inhibit” FRS
(free run stop) and 4 as FWD (start/stop clockwise rotation)
Figure 79: Function chart for FRS (control inhibit and free run stop)
n
M
: Motor speed
t
w
: Waiting time (set with PNU b003)
a Motor coasts to a stop
b Synchronization to the current motor speed
c Restart from 0 Hz
FWD
FRS
P2434
FWD/REV
FRS
n
M
t
w
a
c
b
PNU Name RUN b031
= 10
Value Function DS
b003 POWER,
waiting time
before
automatic
restart after
power supply
failure
– j 0.3 – 100 ss Here, set a time which is to expire before an automatic restart is
initiated after a fault signal. This time can also be used in conjunction
with the FRS function. During the delay, the following message appears
on the LED display:
1.0
b088 Motor restart
after removal
of the FRS
signal
– j 00 Restart with 0 Hz 00
01 Restart with the determined output frequency (current motor speed)