Dc Bus Paralleling; 24 Vdc Supply - Emerson Unidrive M702 User Manual

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4.4

DC bus paralleling

DC bus paralleling using standard cable / busbars is supported by all
frame sizes.
On frame sizes 3, 4, 5 and 6 terminal and enclosure design enables the
DC bus of a number of drives to be connected together using pre-made
busbars. The diagram below shows how the busbar links connect the
DC bus of several drives together.
The connecting of the DC bus between several drives is typically used to:
1. Return energy from a drive which is being overhauled by the load to
a second motoring drive.
2. Allow the use of one braking resistor to dissipate regenerative
energy from several drives.
Figure 4-11 DC bus paralleling (size 3 shown)
There are limitations to the combinations of drives which can be used in
this configuration.
For application data, contact the supplier of the drive.
NOTE
The DC bus paralleling kit is not supplied with the drive but available to
order from Control Techniques.
Table 4-2 DC bus paralleling kit part numbers
Size
3
4
5
6
4.5

24 Vdc supply

The 24 Vdc supply connected to control terminals 1 & 2 provides the
following functions:
• It can be used to supplement the drive's own internal 24 V supply
when multiple option modules are being used and the current drawn
by these module is greater than the drive can supply.
• 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
Unidrive M702 User Guide
Issue Number: 3
Electrical Getting Basic
installation started parameters the motor
CT part number
3470-0048-00
3470-0061-00
3470-0068-00
3470-0063-00
Running NV Media Card
Optimization
Operation
allows any fieldbus modules, application modules, encoders or serial
communications to continue to operate.
• It can be used to commission the drive when the line power supply is
not available, as the display operates correctly. However, the drive
will be in the Under voltage trip state unless either line power supply
or low voltage DC operation 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).
• If the DC bus voltage is too low to run the main SMPS in the drive,
then the 24 V supply can be used to supply all the low voltage power
requirements of the drive. Low Under Voltage Threshold Select
(06.067) must also be enabled for this to happen.
NOTE
On size 6 and larger, if the power 24 Vdc supply is not connected none
of the above mentioned functions can be used and "Waiting For Power
Systems" will be displayed on the keypad. The location of the power 24
Vdc can be identified from Figure 4-12.
Table 4-3 24 Vdc Supply connections
Function
Supplement the drive's
internal supply
Back-up supply for the
control circuit
The working voltage range of the control 24 V power supply is as
follows:
1 +24 Vdc
2 0 V
Nominal operating voltage
Minimum continuous operating voltage
Maximum continuous operating voltage
Minimum start up voltage
Maximum power supply requirement at 24 V
Recommended fuse
Minimum and maximum voltage values include ripple and noise. Ripple
and noise values must not exceed 5 %.
The working range of the 24 V power supply is as follows:
51 0 V
52 +24 Vdc
Size 6
Nominal operating voltage
Minimum continuous operating voltage
Maximum continuous operating voltage
Minimum startup voltage
Maximum power supply requirement
Recommended fuse
Size 7 and 8
Nominal operating voltage
Minimum continuous operating voltage
Maximum continuous operating voltage
Minimum startup voltage
Maximum power supply requirement
Recommended fuse
Onboard Advanced Technical
Diagnostics
PLC parameters data
Sizes 3-5
Terminal
1, 2
Terminal
1, 2
24.0 Vdc
19.2 V
28.0 V
21.6 V
40 W
3 A, 50 Vdc
24.0 Vdc
18.6 Vdc
28.0 Vdc
18.4 Vdc
40 W
4 A @ 50 Vdc
24.0 Vdc
19.2 Vdc
30 Vdc
21.6 Vdc
60 W
3 A @ 50 Vdc
UL listing
information
Sizes 6-8
Terminal
1, 2
Terminal
1, 2
51, 52
57