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Zenith Automatic Transfer Switch | new.abb.com/low-voltage
S5P
Auto / Semi Manual programmable selector
In “Auto” position, retransfer to Source 1 is automatic after
the T timer has timed out. The T time delay is bypassed if
Source 2 fails. In “Manual”, retransfer to Source 1 is upon
depression of BYPASS DELAY button YEN or if Source 2 fails.
S12P
Auto / Manual programmable selector
In “Auto” position, the Automatic Transfer Switch functions
“Manual” the Automatic Transfer Switch will transfer to either
direction upon depression of Source 1 or Source 2 transfer
buttons XFR. Should Source 1 fail, the Generator (Source 2), will
automatically start. Once transferred in Manual, the Switch
maintains position selected even if selected power fails.
S13P
Transfer Commit.
When this feature is set to OFF: The transfer Switch is
not committed to transfer unless the outage duration is
longer than the timers that precede the transfer to Source
2 position. This assumes that the outage will be an isolated
event. When this feature is set to ON: The transfer Switch is
committed to transfer to Source 2 position once the W timer
has begun timing, even if Source 1 power returns before the
transfer to Source 2. This is to ensure that the transfer takes
place, because one outage may be followed by another.
S14
Test / Auto / Source 1 Selector, Door mount
SW1
(Keyed or non-keyed operation available)
SW3
Source Priority Selector Switch, Door mount
Allows selection of Source 1 or Source 2 to be the Prime Source.
Transfer Switch will transfer to selected Prime Source if that
Source is available. (Keyed or non-keyed operation available)
T
Time Delay (S1) Source 1 Stable Timer.
To delay transfer to Source 1 (immediate retransfer
on Source 2 failure). Adjustable 0-60 minutes
in 1 second increments. Standard setting is 30
T3/W3
Elevator Pre-Signal Auxiliary Contacts: Open 0-60 seconds
prior to transfer to either direction, re-closes after transfer.
U
(S2) Source 2 Stop Delay Timer, allows Engine to run unloaded
after switch retransfer to Source 1. Adjustable 0-60
minutes in 1 second increments. Standard setting is
UMD
Universal Motor Load Disconnect Circuit: Auxiliary
Contact opens 0-60 seconds prior to transfer in either
by end user for Pre-transfer, Post-transfer, or both.
VI
Voltage Imbalance (Three Phase)
For a three phase source, this feature monitors phase voltage
ratios based on a selected range within a selected time window.
Should any phase fall below the selected lower window limit
or exceed the selected higher window limit within the selected
time frame, the controller initiates transfer to the other source.
Range: 5% to 20% of Nominal voltage, 10 to 30 seconds
window, user adjustable.
Resolution: 1% Increments
Factory default: 10% “Fail”, 8% “Restore”, 30 Seconds.
Percentage and time Windows
W
Time Delay (S2) Source 2 Stable Timer.
To delay transfer to Source 2.
Adjustable 0-5 minutes in 1 second increments.
Standard setting is 1 second. Adjust via
YEN (BYPASS)
Bypass Timers Key utilizing Keypad. When applicable,
the system prompts the user to press a button to
bypass (T) or (W) Timers should the user so desires.
