5-41
Pulse count factor 1 (d62), Pulse count factor 2 (d63)
For the pulse train input, function codes d62 (Command (Pulse rate input), (Pulse count factor 1)) and d63 (Command (Pulse
rate input), (Pulse count factor 2)) define the relationship between the input pulse rate and the frequency command
(reference).
Pulse train input rate
Np (kp/s)
Frequency reference
f
*
(Hz)
0
Pulse count factor 1 (d62)
Pulse count factor 2 (d63)
Relationship between the Pulse Train Input Rate and Frequency Command (Reference)
As shown in the figure above, enter the pulse train input rate into function code d62 (Command (Pulse rate input), (Pulse
count factor 1)), and enter the frequency reference defined by d62 into d63 (Command (Pulse rate input), (Pulse count factor
2)). The relationship between the pulse train input rate (kp/s) inputted to the
PIN
terminal and the frequency reference f*
(Hz) (or speed command) is given by the expression below.
f
*
(Hz) = Np (kp/s) ×
Pulse count factor 2 (d63)
Pulse count factor 1 (d62)
f* (Hz)
: Frequency reference
Np (kp/s)
: Input pulse rate
In the case of A and B phases with 90 degree phase difference, note that the pulse
train rate is not the one 4-multiplied.
The pulse train sign, forward/reverse rotation pulse, and A/B phase difference define the polarity of the pulse train input.
Combination of the polarity of the pulse train input and the
FWD
/
REV
command determines the rotational direction of the
motor. The table below shows the relationship between the polarity of the pulse train input and the motor rotational
direction.
Pulse Train Polarity
Run command
Motor rotational direction
Positive (+)
FWD
(Run forward command)
Forward
Positive (+)
REV
(Run reverse command)
Reverse
Negative (-)
FWD
(Run forward command)
Reverse
Negative (-)
REV
(Run reverse command)
Forward
Mounting an optional PG interface card automatically switches the pulse train input source to the card and disables
the input from the terminal [X7].
Filter time constant (d61)
d61 specifies a filter time constant for pulse train input. Choose an appropriate value for the time constant taking into
account the response speed of the machinery system since a large time constant slows down the response. When the
reference frequency fluctuates due to small number of pulses, specify a larger time constant.
Switching frequency command
Using the terminal command
Hz2/Hz1
assigned to one of the digital input terminals switches between frequency command 1
(F01) and frequency command 2 (C30).
For details about
Hz2/Hz1
, refer to E01 to E07 (data = 11).
Terminal command
Hz2/Hz1
Frequency command source
OFF
Follow F01 (Frequency command 1)
ON
Follow C30 (Frequency command 2)
Summary of Contents for FRENIC-MEGA
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