Atec Chroma-63200 Series - Manual (Page 3)

8. SURGE LOAD CAPABILITY
Chroma’s 63200 Series DC Loads provide a unique surge
load simulation capability which allows users to overdrive
the loads up to 2.7 times their rated power for short periods.
This feature is ideal when the average power require by the
UUT is low compared to short-term peak power demands.
Plasma Display Panel (PDPs) testing is one typical applica-
tion, others include battery 3C discharge, breaker & fuse
over rating (300% to 1000%) tests, car engine startup simu-
lation and DC motor startup simulation.
The amount of surge loading available using the 63200
loads is related to the initial loading conditions. Figures 1
and 2 show the relationship of initial state (Load_Low under
Dynamic mode) and the maximum acceptable overdrive
power. Under this operation, the load will display an Over
Power Protection Alarm (OPP) and will disable the load cur-
rent if the user violates the maximum surge load capability
showed in the figures.
Note 1 :
The Initial state under Static Mode should last at least 1 second.
Note 2 :
This surge load capability will be regulated by the temperature de-rat-
ing characteristics. (Refer to Note 1 in Specifications)
Note 3 :
Examples below assume the use of the Model 63201 load with a con-
tinuous rating of 2600W/300A/1-80VDC
9. TIMER FUNCTION FOR BATTERY
DISCHARGE TESTING
The 63200 Loads include unique timing & measurement
function allowing for precision time settings and measure-
ments in the range of 1s to 99999s. This feature allows
users to set a final voltage & timeout value for battery dis-
charge testing and similar applications.
For Example, Figure 3 below shows that the 63200’s internal
timer can be initiated automatically when the battery voltage
falls below a preset value. The timer will continue counting
until the second preset voltage value is reached.
Example 1: STATIC LOADING
The Model 63201 can be overdriven to approximately 5200W (200% of its rated con-
tinuous power rating) for 6.0 ms seconds when the starting power is 650W (25% of its
rated power). This is represented by DOT on the blue curve in Figure 1.
Example 2: DYNAMIC LOADING
The Model 63201 is capable of a zero – to- 6500W (250%) pulse at a duty cycle of 5%.
This is represented by the DOT on the purple curve in Figure 2.
7. SHORT CIRCUIT SIMULATION
63200 series electronic loads can also simulate short circuit condition. Owing to this capability, it can short DC power source or any power sup-
plies that have built in current limit function, and measure their short circuit currents. So that users can verify if the UUT current limit is functional.
APPLICATIONS
1. POWER SUPPLY TESTING
Power supplies have played a critical role on electrical and electronic devices. They are diversified into several different configurations for different
applications. For example, AC/AC power supplies are for UPS and AVR, AC/DC power supplies are for PC power supplies, and DC/AC power
supplies are for inverters that transfer battery power to AC for home appliances. As to DC/DC converters, they are widely used in battery pow-
ered devices such as cellular phones and laptop computers. With four different load modes, Chroma 63200 series electronic loads are capable
of testing all sorts of DC output power supplies directly or via rectifier, they can also be used to test the AC output power supplies.
CC & CR Mode
CV Mode
A/ D Power supply
D/ D Converter
Battery charger
UPS/AVR