Important Considerations - Emerson Unidrive M700 User Manual

Parameter Description
Active supply
Pr 06.044
Pr 06.072 User supply select
Pr 06.065 Standard under voltage threshold
Pr 06.066 Low under voltage threshold
Pr 06.067 Low under voltage threshold select
Pr 06.073 Braking IGBT lower threshold
Pr 06.074 Braking IGBT upper threshold
Pr 06.075 Low voltage braking IGBT threshold
Pr 06.076 Low voltage braking IGBT threshold select
6.6

Important considerations

1 Electrical connections and configuration can change for the different drive frame sizes.
•
Drive frame size 3 to 6 have a diode rectifier input stage with an internal soft start circuit
which can be limit the inrush current for both AC and DC connected supplies
- Consider inrush current in control sequence
•
Drive frame sizes 7 and larger have a half controlled rectifier which limits the inrush current
for AC supplies only, for Low voltage DC supplies an external soft start circuit is required
- External soft start circuit required for Low voltage DC supply
- Consider inrush current in control sequence
2 The power supplies required for Low voltage DC operation can include the following
•
AC supply
•
UPS supply or Low voltage DC supply
•
External user 24 Vdc power supply
Control PCB (drive frame sizes 3 and larger)
Power Stage (drive frame sizes 6 and larger)
Heatsink cooling fans (drive frame sizes 9 and larger)
- External contactors are required to transition between power supplies
- Fuse protection must be supplied to protect power supplies and cabling
3 Low voltage DC operation can be configured in the following configurations
•
Low voltage DC mode with selection of Low under voltage threshold with Low voltage DC
supply, batteries
- Sequencing controlled by the Elevator controller
•
Low voltage DC mode with selection of Low under voltage threshold using UPS supply
- Sequencing controlled by Elevator controller
•
Low voltage DC mode using drive on-board control to manage seem-less control from AC
supply to Low voltage DC supply, batteries
- Sequencing of the power supplies controlled by drive
- This mode does not currently support operation with a Vac UPS supply
4 Configuration both the AC supply and Low voltage DC supply may be connected at the same time
for seam-less change over from AC mode to DC mode with all drive frame sizes.
•
Seamless changeover from DC mode to AC mode is possible with drive frame size 7 and
larger.
•
Seamless changeover is not supported on the drive for operation with an AC supply and Vac
UPS supply.
•
The drive does NOT have to be disabled during change over from the AC supply to the Low
voltage DC supply.
•
Drive frame sizes 3 to 6 must be disabled for the change over from the Low voltage DC
supply to the AC supply in order to allow the internal soft start circuit to become active and
limit the AC supply inrush.
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Notes
Power supply status
External user 24 Vdc supply
Low voltage DC operation using Low under
voltage threshold select
Brake control voltage setup and low
voltage braking select.