Vdc Supply - Emerson Unidrive M700 Installation Manual

The DC bus paralleling kit is not supplied with the drive but available to order from the
NOTE
supplier of the drive.
Table 4-3 DC bus paralleling kit part numbers
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 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.
Table 4-4 24 Vdc Supply connections
Supplement the drive's internal supply
and back-up supply for the control circuit
* Terminal 9 on Unidrive M702 and Unidrive HS72.
The working voltage range of the control 24 V power supply is as follows:
1 0 V
2 +24 Vdc
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 %.
52
Size
3
4
Function
Unidrive M/HS Frame 3 and 4 Power Installation Guide
CT part number
3470-0048
3470-0061
Sizes 3 and 4
Terminal
1, 2*
24.0 Vdc
19.2 V
28.0 V
21.6 V
40 W
3 A, 50 Vdc
Issue Number: 3