General Information And Operating Notes; Operating Modes - Ametek Amrel PLA Series Operation Manual

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Built in pulse generator for continuous, pulsed, and toggled transient operation.
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Seven programmable protection modes: Over Voltage Protection (OVP), Under Voltage Protection (UVP),
Over Current Protection (OCP), Under Current Protection (UC P), Overpower Protection (OPP), and Under
Power Protection (UPP).
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Fan speed control for reduced acoustic noise under light load conditions.
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0-10Vdc analog programmable.
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Simple closed-case calibration.
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Highest power density: up to 18KW in 2U height
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Field-upgradeable capability for GPIB, RS232, USB and Ethernet.
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Three ranges for each operating mode; Auto or Manual
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External analog programming control for each mode and range
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Panel lock capability
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Program the Slew rise time and Slew fall time independently
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50us transient time at CC mode; 500us transient time at CV mode
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Anti-Oscillation controls: System bandwidth controls
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Oscillation detection and protection
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Anti-Saturation controls: Under Voltage Lockout
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16 bits programming and read back capability
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Cross mode and Cross range capability; default off
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Remote Inhibit and Dry contact Fault output
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Pulse power capability with Overpower Protection
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Field-upgradeable firmware
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Self-diagnostic capability
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Redundant Over Temperature Protection
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Four Step profiles; 256 step points for each profile
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Soft-Start Functionality
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Convenient and efficient Hot Keys for mode and Transient Mode Selection, Input and Transient On/Off Control,
Slew Rate Settings, Front panel trigger, and Short.
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Independent Large Numerical Voltage and Current LED display

GENERAL INFORMATION AND OPERATING NOTES

Operating Modes:

The four modes of operation are:
Constant Current (CC):
The electronic load will sink a current in accordance with the programmed value regardless of the input voltage.
Note 1: Never use CC mode for testing a constant current source. The regulation of the two units will fight for control of
the current and an unstable oscillation will result.
Note 2: During CC mode, the electronic load can operate under the fastest transient time.
Constant Voltage (CV):
The electronic load will attempt to sink enough current to control the source voltage to the programmed value. It acts as a
shunt voltage regulator when operating in the CV mode.
Note 1: Never use CV mode for testing a constant voltage source. The regulators of the two devices will buck each other
trying to gain control of the voltage which will lead to an unstable condition.
Note 2: In CV mode, the transient time will be adjusted to a slower setting to ensure stable operation.
M470039-01 REV-F Page 14