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Unidrive M200 / M201 Control User Guide 19
Issue Number: 2
4 Electrical installation
4.1 24 Vdc supply
The 24 Vdc supply connected to the +24 V supply terminals on the AI-
Backup adaptor provides the following functions:
• It can be used as a back-up power supply to keep the control circuits
of the drive powered up when the line power supply is removed. This
allows any fieldbus modules or serial communications to continue to
operate. If the line power supply is re-applied, then the normal
operation can carry on after the drive automatically re-initializes the
power board parameters.
• It can be used to clone or load parameters in order to pre-configure
drives when the line power supply is not available. The keypad can
be used to setup parameters if required. However, the drive will be in
the Under Voltage state unless the line power supply is enabled,
therefore diagnostics may not be possible. (Power down save
parameters are not saved when using the 24 V back-up power
supply input).
The working voltage range of the 24 V back-up power supply is as
follows:
Minimum and maximum voltage values include ripple and noise. Ripple
and noise values must not exceed 5 %.
Figure 4-1 Location of the 24 Vdc power supply connection on the
AI-Backup adaptor
The 24 Vdc Backup supply can be used on all frame sizes.
4.2 Communication connections
Installing an AI-485 Adaptor provides the drive with a 2 wire EIA 485
serial communications interface. This enables the drive set-up, operation
and monitoring to be carried out with a PC or controller as required.
Figure 4-2 Location of the AI-485 Adaptor option
4.2.1 EIA 485 serial communications
The drive only supports Modbus RTU protocol. See Table 4-1 for the
connection details.
Standard Ethernet cables must not be used when connecting drives on
a EIA 485 network as they do not have the correct twisted pairs for the
pinout of the serial comms port.
Table 4-1 Serial communication port pin-outs (RJ45)
Minimum number of connections are 2, 3, 7 and shield.
Table 4-2 Serial communication port pin-outs (screw terminal
block)
N
The connections on the RJ45 connector and terminal block are in
parallel.
0 V
0 V (connected internally to 0V common - Control
terminal 1)
+ 24 V + 24 V Backup supply input
Nominal operating voltage 24.0 Vdc
Minimum continuous operating voltage 19.2 V
Maximum continuous operating voltage 30.0 V
Minimum start up voltage 12.0 V
Minimum power supply requirement at 24 V 20 W
Maximum power supply continuous current 3 A
Recommended fuse 1 A, 50 Vdc
Pin Function
1 120 Termination resistor
2RX TX
30 V
4 +24 V (100 mA) output
5 Not connected
6 TX enable
7RX\ TX\
8 RX\ TX\ (if termination resistors are required, link to pin 1)
Pin Function
10 V
2 RX\ TX\ (if termination resistor required, link to pin 4)
3RX TX
4 120 Termination resistor
5 TX Enable
6 +24 V (100 mA) output
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