8
ABB Zenith
ZTSCT / ZBTSCT Operation & Maintenance Manual
User Setting for Voltage & Frequency
Source 1
Under Voltage “Restore”
Factory Default: 90%
This adjustment determines the minimum acceptable
voltage required to transfer to Source 1. Adjust via the
SET menu. Range is 85% to 100% in 1% increments (see
page 17). Once satisfied, the T timer will begin timing
to transfer to Source 1.
Under Voltage “Fail”
Factory Default: 80%
This adjustment determines the low voltage threshold.
Adjust via the SET menu. Range is 75% to 98% in 1%
increments (see page 17). “Fail” must be a minimum of 2%
below “Restore” setting. Once voltage falls below threshold,
P timer begins timing to signal Source 2 Generator to start.
Under Frequency “Restore”
Factory Default: 95%
This adjustment determines the minimum acceptable
frequency required to transfer to Source 1. Adjust via the
SET menu. Range is 90% to 100% in 1% increments
(see page 17). Once satisfied, the T timer will begin
timing to transfer to Source 1.
Under Frequency “Fail”
Factory Default: 90%, (5 seconds minimum)
This adjustment determines the low frequency threshold.
Adjust via the SET menu. Range is 88% to 98% in 1%
increments (see page 17). “Fail” must be a minimum of
2 % below “Restore” setting. Once satisfied, the T timer
will begin timing to transfer to Source 1.
Over Frequency “Restore”
Factory Default: 102%
This adjustment determines the minimum acceptable Over
Frequency threshold at which the transfer switch is allowed
to re-transfer to Source 1. Adjust via the SET menu. Range
is 102% to 104% in 1% increments (see page 17). “Restore”
must be a minimum of 1% below “Fail” setting.
Over Frequency “Fail”
Factory Default: 105%
This adjustment determines the maximum acceptable
Over Frequency. Adjust via the SET menu. Range is 103%
to 105% in 1% increments (see page 17).Once exceeded,
the P timer begins timing to signal the generator to start.
Source 2
Under Voltage “Restore”
Factory Default: 90%
This adjustment determines the minimum acceptable
voltage required to transfer to Source 2. Adjust via the
SET menu. Range is 85% to 100% in 1% increments
(see page 17). Once satisfied, the W timer will begin
timing to transfer to Source 2.
Under Voltage “Fail”
Factory Default: 80%
This adjustment determines the low voltage threshold.
Adjust via the SET menu. Range is 75% to 98% in 1%
increments (see page 17). “Fail” must be a minimum of 2%
below “Restore” setting. Once voltage falls below threshold,
T timer will be bypassed to expedite the transfer to Source 1.
Over Voltage “Fail”
Factory Default: 110%
This adjustment determines the maximum acceptable
Over Voltage. Adjust via the SET menu. Range is 105%
to 110% in 1% increments (see page 17). Once exceeded,
the T timer will be bypassed to expedite the transfer to
Source 1.
Over Voltage “Restore”
Factory Default: 105%
This adjustment determines the minimum acceptable
Over Voltage threshold at which the transfer switch is
allowed to transfer to Source 2. Adjust via the SET menu.
Range is 103% to 105% in 1% increments (see page 17).
“Restore” must be a minimum of 2% below “Fail” setting.
Under Frequency “Restore”
Factory Default: 95%
This adjustment determines the minimum acceptable
frequency required to transfer to Source 2. Adjust via the
SET menu. Range is 90% to 100% in 1% increments (see
page 17). Once satisfied, the W timer will begin timing
to transfer to Source 2.
Under Frequency “Fail”
Factory Default: 90%, (5 seconds minimum)
This adjustment determines the low frequency threshold.
Adjust via the SET menu. Range is 88% to 98% in 1%
increments (see page 17). “Fail” must be a minimum of 2%
below “Restore” setting. Once satisfied, the W timer will
begin timing to transfer to Source 2.
Over Frequency “Fail”
Factory Default: 105%
This adjustment determines the maximum acceptable
Over Frequency. Adjust via the SET menu. Range is 103%
to 105% in 1% increments (see page 17). Once exceeded,
the T timer will be bypassed to expedite the transfer to
Source 1.
Over Frequency “Restore”
Factory Default: 102%
This adjustment determines the minimum acceptable
Over Frequency threshold at which the transfer switch is
allowed to re-transfer to Source 2. Adjust via the SET menu.
Range is 102% to 104% in 1% increments (see page 17).
“Restore” must be a minimum of 1% below “Fail” setting.
Standard 3-Phase Sensing on 3 and 4 Pole Units
