EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

• 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).
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)
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