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20 Unidrive M200 / M201 Control User Guide
Issue Number: 2
4.2.2 Isolation of the EIA 485 serial communication
port
The serial communication port is single insulated and meets the
requirements for ELV.
An isolated serial communications lead has been designed to connect
the drive to IT equipment (such as laptop computers), and is available
from the supplier of the drive. See below for details:
Table 4-3 Isolated serial comms lead details
The “isolated serial communications” lead has reinforced insulation as
defined in IEC60950 for altitudes up to 3,000 m.
4.3 Control connections
4.3.1 General
Table 4-4 The control connections consist of:
Key:
All analog terminal functions can be programmed in menu 7.
All digital terminal functions (including the relay) can be programmed in
menu 8.
N
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.
Figure 4-3 Default terminal functions
When using the communications port with a personal
computer or centralised controller e.g. PLC, an isolation
device must be included with a rated voltage at least equal
to the drive supply voltage. Ensure that the correct fuses are
installed at the drive input, and that the drive is connected to
the correct supply voltage.
If a serial communications converter other than the CT
Comms cable is used to connect to other circuits classified
as Safety Extra Low Voltage (SELV) (e.g. to a personal
computer), then a safety isolating barrier must be included to
maintain the SELV classification.
Part number Description
4500-0096 CT USB Comms cable
Function Qty
Control parameters
available
Terminal
number
Single ended analog
input
2
Mode, offset, invert, scaling,
destination
2, 5
Analog output 1 Source, mode, scaling, 7
Digital input 5 Destination, invert
5, 11, 12,
13, 14
Digital input / output 1
Input / output mode select,
destination / source, invert
10
Frequency input 1
Maximum reference, input
limit, scaling, destination
14
PWM or frequency
output
1
Source, scaling, maximum
output frequency, mode
10
Motor thermistor input 1
Mode, type, trip threshold,
reset threshold
14
Relay 1 Source, invert 41, 42
Drive enable 1 11
+10 V User output 1 4
+24 V User output 1 9
0V common 1 1
Destination parameter:
Indicates the parameter which is being controlled
by the terminal / function
Source parameter:
Indicates the parameter being output by the
terminal
Mode parameter:
Analog - indicates the mode of operation of the
terminal, i.e. voltage 0-10 V, current 4-20 mA etc.
Digital - indicates the mode of operation of the
terminal, (the Drive Enable terminal is fixed in
positive logic).
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
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.
If any of the digital inputs (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
suppression is used then over voltage spikes can cause
damage to the digital inputs and outputs on the drive.
1
14
41
42
12
13
At zero frequency
Frequency
Run forward
Run reverse
Analog input 1/
input 2 select
41
42
Relay
(over-voltage
category II)
Drive OK
Analog
frequency
reference 1
Analog
frequency
reference 2
1
4
5
7
9
10
11
2
0V common
Drive enable
+10 V
+24 V
Analog input 1 select
Analog input 2 select
14
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