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the unit back on before the load can be re-applied. Due to the capacitive nature of the
DC power supply, you must hold the load bank in the “Off” position for a couple of
seconds. The unit will retain power otherwise.
3.3
Control System
The control system of the unit 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 Load Bank from the test source in the
event of cooling failure and/or improperly positioned operating controls.
The DC power supply via the load source supplies control power (24VDC). The fan
starts with the power “On” switch. The fan speed is controlled via a TRIAC fan speed
controller in conjunction with a current transformer located on the load wires. As the
current transformer detects a high enough amp draw, the potentiometer’s minimum is
increased.
3.4
Cooling System
A forced air system consisting of one fan (208-240VAC) cools the elements in the load
bank. The “On” switch on the control panel, protected by control fuses, energize the fan
motor.
3.4.1 Load System
The Load System consists of independently controlled resistive load elements
specifically designed for the unit. 200,000 AIC, 600VAC fuses protect each load
step. Simplex, Inc. conservatively selects resistive load elements to provide long
life.
See “Table 4 Parts of Load Bank” on page 24 for specific elements used.
High-temperature, ceramic-clad, stainless-steel rods rigidly support the elements.
An air gap created by the way the support rods are suspended eliminates
element-to-element short circuits.
3.5 Specifications
Capacity
Max Amps
at 208V
Max Amps
at 230V
Max Amps
at 240v
Model
208vAC, 1-ph 230vAC, 1-ph
240vAC, 1-ph
Microstar
13.1KW
16.2KW
17.5KW
63A
70.4A
73A
Max Amps
Per Section Section 1:
14.2A
Section 2 -4:
10.4A
Section 5-6:
14.6A
Table 1 Specifications
Содержание Microstar
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