12
ABB Zenith
ZTSCT / ZBTSCT Operation & Maintenance Manual
Accessory Definitions
(cont’d)
R50
In Phase Monitor this feature restricts Live to Live Source
Transfers to occur unless both Sources are within 7 electrical
degrees or less of each other. (live Source to live Source
transfers usually occur during transfer back to Source 1
or during Testing). R50 does not change the operation of
the Automatic Transfer Switch in a power failure mode.
After all timer functions have elapsed, the CHECKING
FOR SOURCE SYNCHRONISM will be displayed as well
as the direction of transfer (S1-S2 for example denotes
transfer from Source 1 to Source2). When synchronism is
accomplished, transfer will take place.
Notes: - If S2 Frequency is less than S1 Frequency,
display will show a series of (- - - - -…..) symbols.
- If S2 Frequency is greater than S1 Frequency,
display will show a series of (+++++…..) symbols.
- Each (-) or (+) symbol represents 10 electrical
degrees out of phase. A maximum of 18 symbols
(180 electrical degrees) can be monitored.
- The number of (-) or (+) symbols decrease
as the two sources approach synchronism
and increase as the two sources drift out
of synchronism.
- If S1 and S2 Frequencies are identical, the
display will show a series of alternating
- - - -
symbols (++++…) which also indicate the
approximate out of phase degrees
In the event that the Sources do not come within 7 electrical
degrees of each other within 60 seconds, the unit will display
the message: SYNCH CHECKING and will allow the user
to BYPASS. If the BYPASS button is pressed, the unit will
display the message: WARNING MAY CAUSE DAMAGE
TO THE LOAD. Pressing XFR will actually bypass the
R50. Since R50 is a passive device, the length of time it takes
to reach Synchronism is de-pendent on the frequency
difference between the two Sources. Source 1 is usually
a Utility and the frequency is not within the control of
the consumer. Source 2 needs to be adjusted to create an
adequate difference in order for the transfer to happen a
timely fashion.
Note: For optimum performance, Source 2 Generator
should be adjusted a Maximum of 2 Hertz above
or below the Utility frequency, minimum of 0.1
Hertz. (58 to 59.9) or (60.1 to 62) Hertz.
Adjustment of Generator to 60Hertz could
cause lengthy transfer delay
.
R50 Feature can be turned ON or OFF via CFG Menu
(see page 17). Factory Default if OFF.
S5P
Auto / Semi Manual 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 Selector
In “Auto” position, the Automatic Transfer Switch functions
automatically as specified with the Switch drawings. In
“Manual” the Automatic Transfer Switch will transfer to
either direction upon depression of Source 1 or Source 2
transfer buttons. 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. Configured via CFG menu. (see page 17)
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
Auto/Off/Start Engine control selector, Door mount
(Keyed or non-keyed operation available)
SW2
Auto / Off Engine control selector, Door mount
(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 minutes. Adjust via SET menu (see page 18)
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
5 minutes. Adjust via SET menu (see page 18)
