4.6 Drive Inputs and Outputs
The drive operates by receiving control input signals. The
drive can also output status data or control auxiliary
devices. Control input is connected to the drive in 3
possible ways. One way to control the drive is through the
LCP on the front of the drive when operating in hand-on
mode. These inputs include start, stop, reset, and speed
reference.
Another control source is through serial communication
from a fieldbus. A serial communication protocol supplies
commands and references to the drive, can program the
drive, and reads status data from the drive. The fieldbus
connects to the drive through the RS485 serial port or
through a communication option card.
The 3
rd
way is through signal wiring connected to the
drive control terminals. Refer to
. The drive
control terminals are located below the drive LCP.
Improperly connected control wiring can be the cause of a
motor not operating or the drive not responding to a
remote input.
1
4
2
3
130BA012.12
61
68
69
39
42
50
53
54
55
12
13
18
19
27
29
32
33
20
1
Digital I/O terminals
2
RS485 (EIA-485) terminal
3
Analog I/O terminals
4
USB connector
Illustration 4.6 Control Terminals
4.6.1 Input Signals
The drive can receive 2 types of remote input signals:
digital or analog. Digital inputs are wired to terminals 18,
19, 20 (common), 27, 29, 32, and 33. Analog inputs are
wired to terminals 53 or 54 and 55 (common). Underneath
the LCP is a switch used for setting the analog terminal
functions. Some options include more terminals for input
signals.
Analog signals can be either voltage (0–10 V DC) or
current (0–20 mA or 4–20 mA). Analog signals can be
varied like dialing a rheostat up and down. The drive can
be programmed to increase or decrease output in relation
to the amount of current or voltage. For example, a sensor
or external controller can supply a variable current or
voltage. The drive output, in turn, regulates the speed of
the motor connected to the drive in response to the
analog signal.
Digital signals are a simple binary 0 or 1 that act as a
switch. A 0–24 V DC signal controls the digital signals. A
voltage signal lower than 5 V DC is a logic 0 (open). A
voltage higher than 10 V DC is a logic 1 (closed). Digital
inputs to the drive are switched commands such as start,
stop, reverse, coast, reset.
NOTICE
SERIAL COMMUNICATION FORMAT
Do not confuse these digital inputs with serial communi-
cation formats where digital bytes are grouped into
communication words and protocols.
The RS485 serial communication connector is wired to
terminals (+) 68 and (-) 69. Terminal 61 is common and is
sometimes used for terminating shields when the control
cable is run between multiple drives, not other devices.
Refer to
chapter 4.9 Shielded Cable Grounding
for correct
methods for terminating a shielded control cable.
4.6.2 Output Signals
The drive also produces output signals that are carried
through either the RS485 fieldbus or terminal 42. Output
terminal 42 operates in the same manner as the inputs.
The terminal can be programmed for either a variable
analog signal in mA or a digital signal (0 or 1) in 24 V DC.
In addition, a pulse reference can be provided on terminals
27 and 29. Output analog signals generally indicate the
drive frequency, current, torque, and so on, to an external
controller or system. Digital outputs can be control signals
used to open or close a damper, for example, or to send a
start or stop command to auxiliary equipment. Some
options include more terminals for output signals.
Operator Interface and Driv...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
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