TDK Lambda | Z+Low Voltage User Manual

5.3 Alarms and Protective Functions 5.3.1 Introduction

There are several conditions that cause alarm (RED LED blinks). All alarms affect the output. When an alarm occurs, the respective fault will appear on the display and the alarm LED illuminates. It is possible that more than one fault (alarm) may be triggered but only the first will be shown on the display. If the second fault is still active when the first fault is removed, then the second fault will be displayed. The following protective functions are incorporated in the power supply:

• OVP - Over Voltage Protection • UVP - Under Voltage Protection • ILC - Interlock • FOLD - Fold Back Constant Current or Constant Voltage • AC FAIL - AC Power shut down • OTP - Over Temperature Protection

5.3.2 Over Voltage Protection The OVP circuit protects the load in the event of a remote or local programming error or a power supply failure. The protection circuit monitors the voltage at the power supply sense points thus providing the protection level at the load. Upon detection of anOverVoltage condition, the power

supply output will shut down. 5.3.2.1 Setting the OVP Level

TheOVP can be set when the power supply output is Enabled (On) or Disabled (Off ). Theminimum setting level is 5% above the output voltage, or the value in Table 5-1, whichever is higher. The maximum setting level is shown in Table 5-1. 1. Press PROT button. PROT (GREEN) LED illuminates. ”  ” message appears on the Voltage display. 2. Press Voltage encoder. ”  ”message appears on the Voltage display and the Current display shows OVP setting level. 3. Rotate the Current encoder to adjust the OVP level. 4. Press PROT button twice or wait 15 sec. to return display to its previous state and then PROT LED turns OFF.

Model

Max. OVP

Min. OVP

10V 20V 36V 60V

12.0V 24.0V 40.0V 66.0V

0.5V 1.0V 2.0V 5.0V 5.0V

110.0V 100V Table 5-1: Maximum/Minimum OVP setting levels

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