Rockwell Automation 1336 3-20HP FRN 1.01-3.01 - Manual (Page 68)

Wiring
Chapter 6
6-21
Terminal Block TB2 - Terminals 7 and 8
Control and Signal Wiring (cont.)
Pulse Source Input
These terminals are optically isolated and are provided to terminate a pulse
train signal to the drive (Terminal 8+, Terminal 7–). When selected, the
drive output frequency will be the pulse rate at Terminal 8 divided by the
setting of Parameter 46, the Pulse Scale Factor. Refer to the 1336
Programming Manual for details.
Example:
Pulse Scale Factor = 64 (factory setting)
For the drive to generate a 60 Hz drive output, the pulse rate at Terminal 8
must be 60 x 64 or 3,840 pulse- per-second.
Maximum pulse input frequency =
250 (max freq) x 255 (max scale factor) = 63,750 pulse- per-second.
Pulse Source Requirements
•
The drive minimum and maximum frequency setting will limit the
output frequency to these settings if the pulse train results in a frequency
outside that band.
•
The pulse train must be an externally powered square wave, TTL logic
level signal.
•
At the +5V DC or high state, the signal source must produce a voltage
from 4 to 5.5V DC capable of 16mA.
•
At the 0 volts state the voltage must drop to 0.4V DC or less.
!
ATTENTION: If reverse polarity or voltage levels are
maintained above +12V DC, signals may be degraded and
component damage may result.
Terminals 9 and Signal Common
Analog Meter Output
This terminal provides a 0 to +5V DC signal that may be used with a user
supplied analog meter. The load impedance of the meter must be 500
Ω
or
higher. Parameter 25 sets the supply signal to be proportional to either
drive output frequency or percent of load current. The minus signal is
terminated at Terminals 3 or 4. The output is proportional to the signal
selected reaching +5V DC at the maximum frequency setting or 150% of
current.
Important: The displayed load current is an approximate value calculated
from drive internal feedback. Motor characteristics will affect the accuracy
of the load current indication.