INSTRUCTION MANUAL
HWS 3000G
TDK-Lambda
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6-16. Constant voltage output mode voltage shortage alarm (VPF signal)
Detects converter oscillation stop. At this time, the VPF signal goes high.
Conditions for converter oscillation to stop: When the input voltage drops, during a momentary power
outage, when an abnormality occurs that activates various protection functions, when the remote control
is turned off, or when the voltage on the load side is higher than the power supply output setting voltage.
The VPF signal is an open collector output, and the emitter is connected to the DG terminal.
Note: VPF signal may also be output in the following cases
・When the output is light load in parallel operation or N+1 redundant operation
・When the output voltage drops to 10% or less of the nominal voltage
・When the output voltage is suddenly reduced by using the variable output voltage function under
light load conditions.
・When the output voltage is lowered to 10% or less of the rated voltage using the output voltage
variable function
・When the rotation speed of the FAN becomes abnormal or when it stops
6-17. Constant current output mode current shortage alarm (CPF signal)
Detects converter oscillation stop. At this time, the CPF signal goes high.
Conditions for converter oscillation to stop: When the input voltage drops, during a momentary power
outage, when an abnormality occurs that activates various protection functions, when the remote control
is turned off, or when the voltage on the load side is higher than the power supply output setting voltage.
The CPF signal is an open collector output, and the emitter is connected to the DG terminal.
Note: CPF signal may also be output in the following cases
・When the output is light load in parallel operation or N+1 redundant operation
・When the output current is suddenly reduced using the variable output current function
・When using the variable output current function to reduce the output current to 10% or less of the
maximum current
・When the rotation speed of the FAN becomes abnormal or when it stops
Requires a limit on sink current Iex.
Select Vex and Rex so that Iex is within the range of
0.1 to 20mA using the formula below.
Vex is 1V or more and 30V or less.
Iex = ( Vex – 0.3 ) / ( Rex )
TOPTOP
VPF signal output
Vex
Rex
Signal ground
Sink current
Iex
VPF signal output
Vex
Rex
Signal ground
Sink current
Iex
VPF
DG
VPF signal output
Vex
Rex
Signal ground
Sink current
Iex
VPF
DG
CPF signal output
Vex
Rex
Signal ground
Sink current
Iex
CPF signal output
Vex
Rex
Signal ground
Sink current
Iex
CPF
DG
CPF signal output
Vex
Rex
Signal ground
Sink current
Iex
CPF
DG
Requires a limit on sink current Iex.
Select Vex and Rex so that Iex is within the range of
0.1 to 20mA using the formula below.
Vex is 1V or more and 30V or less.
Iex = ( Vex – 0.3 ) / ( Rex )
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