AMETEK Lx Series II - Manual (Page 137)

User Manual Lx / Ls Series II
133
FREQUENCY TRANSIENTS (Group 1 and A(CF) only)
Seq. No Frequency Time
1 400 5 Minute
2 440 150msec
3 420 1.5sec
4 400 5Sec.
5 350 150msec
6 380 1.5sec
7 400 5Sec.
Table 8-6: Normal Frequency Transient Sequence
This test applies to Group1 and A(CF) only. The output voltage is set to Vnom (115 V) while the
frequency is changed per the sequence listed in Table 8-6. The test will cycle 5 times starting
from sequence 2. Steps 3 and 6 apply to A(CF) only.
FREQUENCY VARIATION (Group2 / A(NF) and Group3 / A(WF) only)
Seq. No Initial Frequency Slew rate Final Frequency
Group2 Group3 Hz/Sec Group2 Group3
1 360 360 100 650 800
2 650 800 100 or 200 360 360
3 360 360 Pause 5 sec 360 360
Table 8-7: Normal Frequency Variation Sequence
This test will apply to Group2/A(NF) and Group3/A(WF) only. . The output voltage is set to Vnom
(115 V) while the frequency is set to 360Hz for 5 minutes. The frequency is slowed per the
sequence listed in Table 8-7. The test will cycle 3 times. The frequency will return to nominal
after the test is completed. Slew rates of 200Hz apply to RTCA2 only.