External User 24 Vdc For Low Voltage Dc Mode - Emerson Unidrive M700 User Manual

NOTE:
For drive frame sizes 7 and larger the external contactor which is used to support the soft start
charging system for Low voltage DC mode is located in the DC supply connections.
Initial charging from the Under Voltage state is limited by the inrush resistor and then as the DC Bus
exceeds Pr 06.066 - Low Under Voltage Threshold the external DC contactor will be closed using the
output from Pr 06.069 - Under Voltage System Contact Output. If the AC supply is reconnected the
half controlled rectifier will limit the additional charging current.
The charge system for the AC supply is provided by the half controlled thyristor input bridge within the
drive. The system operates in a similar way to standard mode (i.e. Low voltage DC mode not
enabled) with the following differences.
1. The thyristor charge system always uses a threshold voltage related to Pr 06.065 - Standard
Under Voltage Threshold.
2. Pr 06.069 - Under Voltage System Contact Output is set to On (1) when the DC Bus voltage is
above Pr 06.066 - Low Under Voltage Threshold.
3. Pr 10.016 - Under Voltage active cannot be Off (0) if Pr 06.070 Under Voltage System Contactor
Closed = Off (0).
3.3.3 Elevator controller
The transition from AC Supply mode to the Low Voltage DC mode could also be managed externally
by the Elevator controller in which case the Elevator controller would also activate a digital input to the
drive to enable and disable Low voltage DC mode.
3.4 External user 24 Vdc supply for Low voltage DC mode
During Low voltage DC operation an external user 24 Vdc supply is required to power the Control
PCB (drive frame sizes 3 and larger), Power Stage (drive frame sizes 6 and larger) and heatsink
cooling fans (drive frame sizes 9 and larger).
External user 24 Vdc supply specification
Nominal operating
Minimum operating
Maximum operating
Minimum start-up voltage
Maximum power
Recommended fuse
•
For drive frame sizes 3 and larger an external user 24 Vdc supply is required to power the drive
Control PCB. The 24 Vdc supply will maintain power on the Control PCB when the power supply
is no longer present and during operation in Low voltage DC mode, or, whilst the drive system is
in energy saving, sleep mode.
•
For drive frame sizes 6 and larger the external user 24 Vdc supply is also required for the Power
Stage dependent upon the final DC Bus voltage level. If the DC Bus is below the AC supply loss
level this 24 Vdc supply is required.
•
For drive frame sizes 9 and larger the external user 24 Vdc supply is also required for the
heatsink cooling fans dependent upon the final DC Bus voltage level. If the DC Bus is below the
AC supply loss level this 24Vdc supply is required.
Failure to connect the external user 24 Vdc supply to the Control PCB on drive frame sizes 3 and
larger will result in none of the above mentioned functions being available and
displayed on the drives keypad. On drive frame sizes 6 and larger failure to connect the external user
24 Vdc supply to the Power Stage will result in "Waiting For Power Systems" being displayed on the
drives keypad.
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(Frame 6)
(Frame 3 to 5 & 7 to 10)
(Frame 3 to 6)
(Frame 7 to 10)
(Frame 6)
(Frame 3 to 5 & 7 to 10)
(Frame 3 to 6)
(Frame 7 to 10)
(Frame 3 to 5)
(Frame 6 to 10)
24.0 Vdc
18.6 Vdc
19.2 Vdc
28.0 Vdc
30.0 Vdc (IEC), 26.0 Vdc (UL)
18.4 Vdc
21.6 Vdc
40 W
60 W
3A, 50 Vdc
4A, 50 Vdc
PSU 24V will be