- 4 -
6. Drive Control
For details of PG interface functions available, refer to the FRENIC-MEGA Instruction Manual, Chapter 5, Section 5.2 "Details of
Function Codes" or the FRENIC-MEGA User's Manual.
6-1. Pulse train input
This function gives a frequency command to the inverter in pulse train format. Three types of formats are available--pulse train sign/pulse
train input, run forward/run reverse pulse train, and 90 degree phase shifted A/B pulse trains. Use [XA] and [XB] terminals for the pulse
train frequency command input.
6-1-1. Pulse train input format
Table 3 lists pulse train input formats and operations of this option card.
Table 3 Pulse Train Input Format and Operations
Pulse input format
Operations*
Pulse train sign/pulse train input
Gives the speed command to the inverter, following the pulse input
frequency on the [XB] terminal. Switching the terminal [XA] ON/OFF
determines polarity of the speed command.
Run forward/run reverse pulse
train
Gives the run forward speed command to the inverter, following the pulse
input frequency on the [XB] terminal, if any.
Gives the run reverse speed command to the inverter, following the pulse
input frequency on the [XA] terminal, if any.
90 degree phase shifted A/B
pulse trains
Gives the run forward or run reverse speed command to the inverter,
following 90 degree phase shift and frequency information of two pulse
inputs on [XA] and [XB] terminals.
* Actual rotation direction of the motor is specified by a combination of the pulse input command polarity and
FWD
/
REV
command in the
inverter.
6-1-2. Connection diagram examples
Figure 8 shows the connection diagram example for pulse train input.
OPC-G1-PG
FRENIC-MEGA
PO
XA
XB
XZ
PO
CM
YA
YB
YZ
PI
CM
U
V
W
M
L1/R
L2/S
L3/T
G
Pulse train
generator
When using PG
OPC-G1-PG
FRENIC-MEGA
PO
XA
XB
XZ
PO
CM
YA
YB
YZ
PI
CM
U
V
W
M
L1/R
L2/S
L3/T
PG
G
When using pulse train generator
*1
*1
G
G
*1 For wiring between the encoder and the inverter, use a shielded cable. Basically, the shielded layer should be grounded. If any
malfunction occurs due to noise, however, connecting the shielded layer to the terminal [CM] may reduce the problem.
If the wiring between the encoder and the inverter is long, interference of A- and B-phases may cause encoder signal malfunctions,
resulting in abnormal noise or torque pulsation. In such a case, minimizing the wiring length (by reviewing the wiring route) or using a
cable with a smaller stray capacitance may reduce the problem.
Figure 8 Connection Diagrams for Pulse Train Input
