Table 9-15: Abnormal Over Frequency; Table 9-16: Abnormal Under Frequency - Ametek California Instruments MX15 Series User Manual

The Voltage gradually decays with time to 122 volt by the following equation:
•
• Stay at 122V for 8 seconds before returning to 115V.
Note: Prior to the test, a voltage range change may take place if the power source is set for the
low voltage range. This will cause the EUT to lose power momentarily. If this is not acceptable,
the power source must be left in high range at all times.
The ← key (backspace) will terminate the test at any time.
UNDER VOLTAGE
This test will change the output voltage for the selected phase in the following sequence:
For 400Hz and VFREQ:
0V for 7 seconds.
•
100V for 93 seconds.
•
For 60Hz only
0V for 2 seconds.
•
100V for 8 seconds.
•
The ← key (backspace) will terminate the test at any time.
OVER FREQUENCY
This test will change the output frequency in the sequence shown in Table 9-15 before returning
to the steady state frequency.
The ← key (backspace) will terminate the test at any time.
Revision
Seq1
Seq2
After this sequence, a 5 second delay will be inserted at the nominal test frequency. The ← key
(backspace) will terminate the test at any time.
UNDER FREQUENCY
This test will change the output frequency in the sequence shown in Table 9-16 before returning
to steady state frequency.
The ← key (backspace) will terminate the test at any time.
Revision
Seq1
Seq2
V = 121.7 + 0.583/t. For 0.00334
D
FREQ Time FREQ
480Hz 5sec. 480Hz
420Hz 5sec 420Hz

Table 9-15: Abnormal Over Frequency

D
FREQ Time FREQ
0 5sec. 0Hz
375Hz 5sec 380Hz

Table 9-16: Abnormal Under Frequency

≤ ≤
t
E F
Time FREQ
5sec. 480Hz
9sec 420Hz
E F
Time FREQ
7sec. 0Hz
7sec 380Hz
1.947
F 60Hz only
TIME FREQ TIME
5sec 61Hz 7sec
5sec 60.5Hz 8sec
F 60Hz only
TIME FREQ TIME
7sec 0Hz 7sec
3sec 59.5Hz 8sec
156