ABB Zenith ZTX Series Operation, Maintenance, And Installation Manual page 36

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Z e n i t h Z T X S e r i e s AT S , O P E R AT I O N , M A I N T E N A N C E , A N D I N S TA L L AT I O N G U I D E
4 Manual retransfer:
On: Manual retransfer to priority
source enabled (automatic retransfer
disabled)
Off: Manual retransfer to priority
source disabled (automatic retransfer
enabled)
5 Dropout rU1)/ rF:
Dropout voltage/frequency limit.
For example 5 % / 5 %:
Voltage source is considered
acceptable when measured voltage
is in range 0.95 - 1.05 nominal Voltage
(Un) * Un and measured frequency
is in range 0.95 - 1.05 x nominal
frequency (fn).
6 S1 Failure delay: The time
(0/1/2/3/4/5/10/15/20/30 s) device
waits after priority source failure
before starting automatic transfer
sequence from priority source to
non-priority source.
7 S1 Return delay: The time
(0/1/2/3/4/5/10/15/20/30 min)
device waits after priority source
return before starting automatic
retransfer sequence from non-
priority source to priority source.
8 Generator stop delay: The time
(30 s or 4 min) device waits after
transferring back to priority source
before stopping the generator.
Notice
1 U is also commonly known as V.