User`s manual

186 • Vacon apfiff09 marine
Tel. +358
6
7.11 Master Follower
7.11.1 Master Follower: Standard system
The Master/Follower function is designed for applications in which the system is run by several NXP
drives and the motor shafts are coupled to each other via gearing, chain, belt etc. The NXP drives are
in closed loop control mode.
The external control signals are connected to the Master NXP only. The Master controls the
Follower(s) via a System bus. The Master station is typically speed-controlled and the other drives
follow its torque or speed reference.
Torque control of the Follower should be used when the motor shafts of the Master and Follower
drives are coupled solidly to each other by gearing, a chain etc., so that no speed difference between
the drives is possible.
Speed control of the Follower should be used when the motor shafts of the Master and the Follower
drives are coupled flexibly to each other so that a slight speed difference between the drives is
possible. When both the Master and Followers are speed-controlled, drooping is typically also used.
P
SpeedShare
W 100,00
ADD
+
+
+
F Adjust Reference
R FreqRef2
LIMIT
MN
IN
MX
P Max Freq
P Pos Freq Limit
LIMIT
MN
IN
MX
P - Max Freq
P Neg Freq Limit
LIMIT
MN
IN
MX
Filt x2
IN
TC
OUT
V FreqReference
W FreqRefFilterTC
R FreqRefActual
Switch
IN
TIME
OUT
W StartZeroSpeedTime
R FreqRef1
Final Reference Location
Ramp Control Input
MULDIV
VALUE
MULTIP
DIVIS
RAMP GENERATOR
"Selection
logic"
"Ramp Hold"
"RampSet"
"Force Zero"
"Second Ramp"
"Normal Ramp"
"ByPass"
R FreqRampOut
ADD
+
+
W FreqRampAdd
ADD
+
+
W FreqRampStep
LIMIT
MN
IN
MX
W FreqMax
W
PosFreqLimit
0
LIMIT
MN
IN
MX
W -FreqMax
0
W NegFreqLimit
LIMIT
MN
IN
MX
R FinalFrequencyRef
To Speed Controller
Ramp Control Input
Master Reference
Master Ramp Out