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Installation and operating instructions, ATS021
5.7 Test Modes
ATS021 makes it possible to select two different test modes:
• test of the entire switching procedure (complete Test)
• generator start/stop test (gen set test)
WARNING: when the test procedure ends, the user must make sure the device
is not left accidentally in TEST mode
Complete Test
With ATS021 in manual mode, press TEST: all the LEDs flash twice simultaneously and then the Auto
LED flashes every 0.5 sec
Description of complete TEST sequence
1. Press TEST; generator start (not done if generator is NOT in use)
2. Press TEST; CB1 Opening
3. Press TEST; CB2 Closure
4. Press TEST; CB2 Opening
5. Press TEST; CB1 Closure
6. Press TEST; generator stop (not done if generator is NOT in use)
Table 5.7:
Description of complete TEST sequence ATS021
At the end of the procedure, press TEST again to resume the sequence.
Alarms, if any, on the protection devices control are activated in the same manner as the automatic and
manual operating modes.
The user can stop the TEST sequence by pressing the RESET.
Gen Set Test
This test mode makes it possible to test only the start and stop of the generator with the plant running
without in any way operating the circuit breakers on the lines.
With ATS021 in manual mode, keep TEST pressed for at least 3 seconds: when the TEST button is
released, all the LEDs flash simultaneously twice and then the Auto LED flashes for 0.5 sec every 2 sec .
The test procedure is as follows:
1. Press TEST; start generator
2. Press TEST; stop generator
Table 5.8:
Description of test method GEN SET ATS021
2
5.
Using the automatic transfer switch
22
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