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E300 Design Guide 89
Issue Number: 1
The diagram below shows the state of Under Voltage (L19) and the control signal to the external contactor Under Voltage Contactor Close Output
(O15)).
Figure 4-27 Low under voltage control size 7
The backup supply system contactor is used to provide the charge system for the low voltage DC supply. The charge system for the high voltage 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
mode not enabled) with the following differences.
1. The thyristor charge system always uses a threshold voltage related to the upper under voltage threshold.
2. Under Voltage Contactor Close Output (O15) = On (1) when the DC link voltage is above the lower under voltage threshold.
3. Under Voltage (L19) cannot be Off (0) if Under Voltage System Contactor Closed (O16) = Off (0).
The following diagram shows how these differences apply to the system operation.
Figure 4-28 Low under voltage timing size 7
Low voltage DC supply mode states for size 3 to 6
Drive enable = OFF (0)
Drive enable = On (0)
J65 DC link
voltage
O09 Active
supply = 0
O09 Active
supply = 1
O09 Active
supply = 1
L19 Under voltage active
Upper threshold based on
O11 Standard under voltage threshold
Lower threshold based on
O14 Low under voltage threshold
O15 Under voltage system
contactor output = On (1)
O15 Under voltage system
contactor output = OFF (0)
O15 Under voltage system
contactor output = On (1)
Size 7 under voltage timing with O12 Low voltage supply mode = On (1)
DC link voltage
O15 Under voltage system
contactor output
O16 Under voltage system
contactor closed
Soft start active
L19 Under voltage active
L19 Under voltage active cannot = OFF (0) until
O15 Under voltage system contactor closed = On (1)
Under voltage
threshold
Under voltage
threshold x 1.05
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