Control Connections; Table 4-18 The Control Connections Consist Of - Emerson unidrive sp User Manual

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Information Information Installation
4.12.2 Multi-drop network
The drive can be used on a 2 wire EIA485 multi-drop network using the
drive's serial communications port when the following guidelines are
adhered to.
Connections
The network should be a daisy chain arrangement and not a star,
although short stubs to the drive are allowed.
The minimum connections are pins 2 (RX TX), 3 (isolated 0V), 7 (RX\
TX\) and the shield.
Pin 4 (+24V) on each drive can be connected together but there is no
power sharing mechanism between drives and therefore the maximum
power available is the same as a single drive. (If pin 4 is not linked to the
other drives on the network and has an individual load then the
maximum power can be taken from pin 4 of each drive.)
Termination resistors
If a drive is on the end of the network chain then pins 1 and 8 should be
linked together. This will connect an internal 120Ω termination resistor
between RXTX and RX\TX\. (If the end unit is not a drive or the user
wishes to use their own termination resistor, a 120Ω termination resistor
should be connected between RXTX and RX\TX\ at the end unit.)
If the host is connected to a single drive then termination resistors
should not be used unless the baud rate is high.
CT Comms Cable
The CT Comms Cable can be used on a multi-drop network but should
only be used occasionally for diagnostic and set up purposes. The
network must also be made up entirely of Unidrive SPs.
If the CT Comms Cable is to be used, then pin 6 (TX enable) should be
connected on all drives and pin 4 (+24V) should be linked to at least 1
drive to supply power to the converter in the cable.
Only one CT Comms Cable can be used on a network.
4.13

Control connections

4.13.1 General

Table 4-18 The control connections consist of:

Function Qty
Differential analog input 1
Single ended analog
2
input
Analog output 2
Digital input 3
Digital input / output 3
Relay 1
Drive enable (SAFE
1
TORQUE OFF)
+10V User output 1
+24V User output 1
0V common 6
+24V External input 1
Key:
Destination indicates the parameter which is being controlled by the
parameter: terminal / function
Source
indicates the parameter being output by the terminal
parameter:
Mode analog - indicates the mode of operation of the terminal,
parameter: i.e. voltage 0-10V, current 4-20mA etc.
digital - indicates the mode of operation of the terminal,
i.e. positive / negative logic (the Drive Enable terminal is
fixed in positive logic), open collector.
All analog terminal functions can be programmed in menu 7.
Unidrive SP User Guide
Issue Number: 13
Electrical Getting Basic
installation Started parameters
Control parameters available
Destination, offset, offset trim,
invert, scaling
Mode, offset, scaling, invert,
destination
Source, mode, scaling,
Destination, invert, logic select 27, 28, 29
Input / output mode select,
destination / source, invert, 24, 25, 26
logic select
Source, invert
Source, invert
1, 3, 11, 21,
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Optimization
the motor operation
All digital terminal functions (including the relay) can be programmed in
menu 8.
The setting of Pr 1.14 and Pr 6.04 can cause the function of digital inputs
T25 to T29 to change. For more information, please refer to section
11.21.1 Reference modes on page 256 and section 11.21.7 Start / stop
logic modes on page 261.
The control circuits are isolated from the power circuits in the
drive by basic insulation (single insulation) only. The installer
must ensure that the external control circuits are insulated
from human contact by at least one layer of insulation
(supplementary insulation) rated for use at the AC supply
WARNING
voltage.
If the control circuits are to be connected to other circuits
classified as Safety Extra Low Voltage (SELV) (e.g. to a
personal computer), an additional isolating barrier must be
included in order to maintain the SELV classification.
WARNING
If any of the digital inputs or outputs (including the drive
enable input) are connected in parallel with an inductive load
(i.e. contactor or motor brake) then suitable suppression (i.e.
diode or varistor) should be used on the coil of the load. If no
CAUTION suppression is used then over voltage spikes can cause
damage to the digital inputs and outputs on the drive.
Ensure the logic sense is correct for the control circuit to be
used. Incorrect logic sense could cause the motor to be
started unexpectedly.
Positive logic is the default state for Unidrive SP.
CAUTION
N
NOTE
Any signal cables which are carried inside the motor cable (i.e. motor
thermistor, motor brake) will pick up large pulse currents via the cable
capacitance. The shield of these signal cables must be connected to
ground close to the point of exit of the motor cable, to avoid this noise
current spreading through the control system.
Terminal
N
NOTE
number
The SAFE TORQUE OFF drive enable terminal is a positive logic input
5,6
only. It is not affected by the setting of Pr 8.29 Positive logic select.
N
7,8
NOTE
The common 0V from analog signals should, wherever possible, not be
9,10
connected to the same 0V terminal as the common 0V from digital
signals. Terminals 3 and 11 should be used for connecting the 0V
common of analog signals and terminals 21, 23 and 30 for digital
signals. This is to prevent small voltage drops in the terminal
connections causing inaccuracies in the analog signals.
41,42
31
4
22
23, 30
2
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