Appendix E Auxiliary Back-Up Supply; Functions; Auxiliary Back-Up Supply Requirements - Control Techniques M'Ax 403 User Manual

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Appendix E Auxiliary Back-up
Supply
Isolation
The auxiliary back-up supply must be isolated from
ground since it is referenced to –DC of the DC bus. It
must also be isolated from any other auxiliary back-up
CAUTION
supply except when the DC-buses of the Drives are
connected in parallel. Failure to observe these
requirements will result in damage to the back-up
supplies and Drive(s).
When low-speed positioning of the motor shaft is
required, the positive output of the back-up supply
must be connected to terminal +DC of the Drive via a
1000V blocking diode and fuse, as shown in Figure E–
1. The auxiliary back-up supply must NOT be
connected directly to terminal +DC.
Supply interlock
The supply interlock circuit shown in Figure E-1 MUST
be connected.
Failure to observe any of these requirements will result
in damage to the Drive(s) and auxiliary back-up supply/
supplies.
E.1

Functions

• Maintains the DC supply to the control circuits of the Drive.
• Maintains the 24V supply to the SLM .
• Maintains the 24V user supply .
• When suitably rated, the auxiliary back-up supply can also supply
power to the motor for positioning at low speed
E.2 Auxiliary back-up supply
requirements
• Voltage: 28VDC ~ 32VDC
• Maximum output current to the control circuits (of each Drive): 2A
• One digital input and one digital output of the Drive are required for
the supply interlock circuit.
• When suitably rated, the auxiliary back-up supply can also supply
power to the motor for positioning at low speed.
• Specific parameters must be adjusted.
Refer to Planning the signal-current consumption on page 16). The
maximum current available for the following for each Drive is 400mA:
• SLM
• 24V user supply
• Digital outputs
• Drive-status supply
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M'Ax User Guide
Issue Number: 4