Trane CenTraVac Duplex CDHF Operation & Maintenance Manual page 70

Figure 24. Test and start timing sequence
Steps A to F: Starter Integrity Test
Steps G to N: Starter Timing
Interval
A. (Test for transition complete
input open)
B. (Just delay time)
C. (Close 1M (2K1) Contactor and test
for no current.) (Starter integrity test)
D. (Hold 1M (2K1) Contactor and test
for no current.) (Starter integrity test)
E. (Open 1M (2K1) Delay time
F. (Close Shorting Contactor (2K3) and
and test for no current, then wait for
Start command.) (Starter integrity test)
G. (Close 1M (2K1 and 2K11)
H. (Wait 1.5 seconds after phase currents
drop to 85 percent)
J. (Begin Transition sequence)
K. (Open S (Shorting) Contactor)
L. (Close 2M (2K2) Contactor
M. (Wait to look for Transition complete)
N. (Filtering time on Transition
complete input)
70
Control Sequence
of Operation
Minimum Maximum
100
2.0
1 2
85 100
250 300
Timing requirements to operate the
"Stop", "Start", "Short",
"Transition", and "Run" contact
closure outputs are shown below.
Prior to closing the "Short" contact,
the transition complete input shall be
verified to be open, otherwise an
MMR diagnostic shall be generated.
Units Actual Design
160 to 240 milliseconds
20 milliseconds
500 milliseconds
200 milliseconds
milliseconds 1 second (Minimum)
second
second
milliseconds 100 milliseconds
milliseconds 260 milliseconds
140 milliseconds
milliseconds 2.32 to 2.38 second
milliseconds 160 to 240 milliseconds
1 second
2 second
1.5 second
CDHF-SVU01C-EN