6.2 PG Interface Expansion Card
6-33
Chap. 6
CONTROL OPTIONS
6.2.5 Synchronized operation
6.2.5.1 Synchronized operation system architecture
Systems for synchronously operating motors with a FRENIC-VG utilize master/slave connections,
cascading connections, or pulse train commands from a PLC or other external transmitter.
(1) Master/slave connections
• When using a master/slave connection, up to one FRENIC-VG can be connected in parallel to the slave side of
the system (8 mA sink current/1 circuit). Use a cascading connection if you need to connect two or more
FRENIC-VG units as slaves.
• When the direction of rotation for slave motors will be opposite that of the master, use the IVS contact instead
of the REV contact.
This technique allows open collector pulse output from one
FRENIC-VG (the master) to be passed to PG card input of another
FRENIC-VG (the slave) that you wish to operate synchronously.
Up to one FRENIC-VG can be connected in this way, as shown
below.
Table 6.2.9
Master open collector output [FA], [FB],
and [CM] terminals
Slave OPC-VG1-PGo [PA],
[PB], and [CM] terminals
15 mA max. per circuit 8 mA max. per circuit
When using master/slave synchronized operation, the slave's
synchronized operation speed is obtained by multiplying the
master's speed by the pulse compensation factor (function codes
o14 and o15).
Change the slave motor's direction of rotation with each slave unit's
[IVS] contact (forward operation/reverse operation). The [REV]
contact cannot be used in this configuration.
Table 6.2.10
Master's direction of
rotation
Slave [IVS] Slave's direction of rotation
Forward OFF Same as master
Forward ON Opposite of master
Reverse OFF Same as master
Reverse ON Opposite of master
(2) Cascading connections
• When using a cascading connection, set function code E29 (PG pulse output selection) to 9 for slave units
(slave 1, 2, etc., but not the master) in order to avoid a delay between the master and the final slave unit.
Figure 6.2.25
Max. 1 slave
FA and FB terminal open
collector output
OPC-VG1-PGo
Master
FRENIC-VG
1500
FRENIC-VG
1500
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