KEPCO MST Series - Manual (Page 16)

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MST SERIES 061813
1.4.2 STATUS INDICATORS
Six status indicators at the front panel provide operational information (see Table 2-2):
• VOLTAGE MODE
• CURRENT MODE
• CURRENT SHARE
• OUTPUT ENABLED
• POLARITY REVERSED
• OUTPUT FAULT
1.4.3 FRONT PANEL METERS
Two digital meters at the front panel provide displays of output voltage and current. These dis-
plays show 3.5 digits and are provided for reference only, accurate to 0.5% (typical) for voltage
and 1.5% (typical) for current.
1.4.4 OUTPUT ENABLE/DISABLE AND POLARITY REVERSAL
The MST Power Module features integral relays to enable/disable the output and to allow polar-
ity reversal. Separate relays are provided for power and sense connections. Disabling the MST
as a voltage source means opening the connection between the power supply and its load. Dis-
abling the MST as a current source means shorting the power supply's output terminals. The
polarity reversal relays provide for two-quadrant operation.
1.4.5 PROTECTION
The MST Power Module incorporates the following protection circuits which cause the MST to
automatically isolate the load and force power module output voltage and current to zero.
• Overvoltage protection: Tracks output voltage; activated if the output goes out of toler-
ance (see PAR. 3.7.2).
• Overcurrent protection: Tracks output current; activated if the output goes out of toler-
ance (see PAR. 3.7.2).
• Overtemperature: Activated when the internal temperature exceeds a safe operating
threshold (see PAR. 3.7.3).
• AC loss: Activated if loss of source power detected (see PAR. 3.7.4).
• Open power lead and sense wire: Activated if an open sense wire or open power lead is
detected (see PAR. 3.7.5).
1.4.6 SERIES CONFIGURATIONS
The output of the MST Power Module “floats;” so that MST Power Modules can be connected in
series to obtain higher output voltages, up to a maximum of ± 500 Volts referenced to the chas-
sis (see PAR. 3.6).