Instructions

NEMIC-LAMBDA
LS50 ⋅ 75 ⋅ 100 ⋅ 150 Series
INSTRUCTION MANUAL
3. Explanation of Functions and Precautions
3-1. Input Voltage Range
Input voltage range is single phase 88 ~ 264VAC ( 47 ~ 63Hz ) or 125 ~ 373VDC for LS50, LS75 and LS100.
For LS150, selectable switch 115/230VAC will decide the input voltage range as mentioned in the table below.
Input voltage which is out of specification may cause unit to damage. For cases where conformance to various
safety specs(UL,CSA,EN) are required, input voltage range will be 100~240VAC (50/60Hz ).
Note : LS series can withstand Input Surge of 300VAC for 5 seconds.
LS150 – Selectable voltage range
Selected Range Applicable Input Voltage Range in VAC Applicable Input Voltage Range in VDC
115 88 ~ 132 NA
230 176 ~ 264 248 ~ 373
3-2. Output Voltage Range
V.ADJ trimmer is for output voltage adjustment within the range of specifications.Turning the trimmer clockwise will
cause the output voltage to be increased. Note over voltage protection ( OVP ) function may trigger if the output voltage
is increased excessively.
3-3. Inrush Current
Power Thermistor is built in to protect the circuit from Inrush Current. Please carefully select input switch and fuse in
cases of the high temperature and re-input the power.
3-4. Over Voltage Protection (OVP)
The OVP function ( Inverter shut down method, manual reset type ) is provided. When OVP triggers, the output will be
shut down. The input shall be removed for a few minutes, and then re-input for recovery of the output. OVP setting is
fixed and not to be adjusted externally.
3-5. Over Current Protection (OCP)
Current limiting, automatic recovery. OCP function operates when the output current exceeds OCP specifications. The
output will be automatically recovered when the overload condition is removed. Do not operate overload or dead short
conditions for more than 30 seconds, which could result in damage or insulation failure.
3-6. Output Ripple & Noise
Ripple & noise are measured at 20MHz by using a 300mm twisted pair of load wires terminated with a 0.1uF film ca-
pacitor & 47uF electrolytic capacitor. When load lines are longer, ripple will become larger. The output ripple cannot be
measured accurately if the probe ground lead of oscilloscope is too long. At low temperature, large ripple & noise may
also be observed due to large ESR of the internal Electrolytic Capacitors especially at -25degC. Output voltage rise may
not be smooth during initial turn on at low temperature.
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