MICROSTAR + SYSTEM MANUAL • page 4 of 21
Simplex, Inc., 270 Riverside Parkway Suite G Austell, GA 30168 • 678-214-6575 • Fax 678-214-6670
Printed in the USA. • www.simplexdirect.com
DESCRIPTION - Continued
The Microstar + is protected against cooling failure (loss of cooling air flow, high temperature intake, or high
exhaust air temperature, all of which could damage the Microstar + or present a safety hazard to the
operator.) When a cooling failure occurs the automatic safety feature in the control system immediately
remove all load. The malfunction must be corrected and the system must be reset by turning the Microstar +
“Off” then “On” before the load can be re-applied.
CONTROL SYSTEM
The control system allows the operator to apply a desired load to the test source and measure the
response of the test source to the load. This system also contains the circuitry utilized to
disconnect the Microstar + from the test source in the event of cooling failure and/or improperly
positioned operating controls.
Control Power (24VDC) is supplied internally via the load source through the power supply. The fan starts with
the power on switch. The fan speed is controlled via a potentiometer in conjunction with a current transformer
located on the load wires. Once the current transformer detects a high enough amp draw, the range on the
potentiometer allows for higher fan speeds.
CONTROL PANEL DIAGRAM
COOLING SYSTEM
The load elements in the Microstar + are cooled by a forced air system consisting of a one fan system. The
fan motor is energized by the on switch on the control panel and protected by control fuses.
LOAD SYSTEM
The Load System consists of independently controlled resistive load elements specifically designed for the
Microstar +. The Load steps are protected by 200,000aic,600VAC fuses.
Simplex Resistive Load Elements conservatively operate at approximately half the maximum temperature
rating for the alloy (1080˚F vs. 1920˚F).
See Parts Legend Drawing for specific elements used.
These elements are rigidly supported by high-temperature, ceramic-clad, stainless-steel support rods.
Element-to-element short circuits are virtually eliminated. The elements are assembled in the element
chamber in a fashion such that each element can be serviced without disturbing adjacent trays.
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