TDK-Lambda DRF960-1 Serie Manuel page 15

Doc No. 260301
3. Terminal Connecting Method
Pay attention to the input wiring. If it is connected to wrong
terminal, the power supply will be damaged.
•
Input must be off when making connections.
•
Connect (Protective Earth) terminal of input
connector to ground terminal of the equipment.
•
The output load line and input line shall be separated
and twisted to reduce noise sensitivity.
When connecting or removing input and output wire, do
not apply stress to PCB.
4. Explanation of Functions and Precautions
4-1. Input Voltage Range
Input voltage range is single phase 180 ~ 264VAC (47~63Hz)
can withstand 300VAC surge for 5 seconds during operation.
Input voltage which is out of specification may cause unit
damage. For cases where conformance to various safety specs
(UL, CSA, EN) are required, input voltage range will be 200
~ 240VAC (50/60Hz).
4-2. Output Voltage Range
Output voltage is set to the rated value at shipment. V.ADJ
trimmer on the front panel side can be used to adjust the
output voltage within the range specified (refer to
specifications for adjustable range).
To turn the trimmer clockwise, the output voltage will be
increased. Take note when the output voltage is increased
excessively, over voltage protection (OVP) function may
trigger and output voltage will be shut down. Furthermore,
when increasing the output voltage, reduce the output current
so as not to exceed the maximum output power.
4-3. Over Voltage Protection ( OVP )
The OVP function will shut down the output. To reset the
OVP, disconnect the input voltage from the power supply for
a minute and then re-apply. Alternatively, use CNT reset
(Remote ON/OFF: OFF to ON). The OVP point is fixed and
cannot be adjusted externally.
4-4. Over Current Protection ( OCP )
The DRF960 works with two different current protection
modes.
At output currents >150% the unit will shut down after a time
≥ 4 seconds. Manual reset or AC recycle is required.
At output currents >105% the unit goes into constant current
limitation. This function works for a minimum time of 4
seconds with auto recovery. After a time ≥ 4 seconds the unit
will shut down the output. Manual reset or AC recycle is
required.
4-5. Peak output current
The DRF960 can deliver 150% peak current for 4
seconds aiding the startup of capacitive loads and
operation of downstream circuit breakers. The operating
conditions for peak output current are as followed:
(a) Duty cycle of peak current, D <35%
(b) < rated output power and RMS current
(c) Reduce peak current according to output derating
curve for higher ambient temperature.
(d) Adjust peak current according to input voltage
derating curve.
(e) PSU will shut down if the peak output time exceed
4 sec.
(f) Peak output current and its duration are defined as
followed:
4-6. Output Ripple & Noise
The standard specification for maximum ripple value is
measured according to measurement circuit as below. When
load lines are longer ripple can increase. In this case, an
additional electrolytic or film capacitor may be necessary
across the load terminal. Note: The output ripple cannot be
measured accurately if the probe ground lead of oscilloscope
is too long.
+
+
P.S.
C1 C2
-
300mm
C1 : 47uF Electrolytic Capacitor
C2 : 0.1uF Film Capacitor
TDK-Lambda
DRF960 Series
INSTRUCTION MANUAL
Load
1.5m 50 Ω Cable
Oscilloscope
Bandwidth : 20MHz