3G Green Green Globe ZTS User Manual
PB-5066 (6/04)
Since its introduction, the GE Zenith
ZTS Series of
transfer switches has become a hallmark of quality
and performance. Reliability resulting from superior
design and heavy duty construction has made the
ZTS
the industry standard for critical installations.
Our emphasis on research and development, design
improvements, materials, manufacturing methods,
quality assurance, and service yields products that have
been proven in hundreds of thousands of applications.
Subsequent to the first
ZTS units installed, our engin-
eering staff has been dedicated to the improvement
and expansion of our line. Today,
GE Zenith offers the
widest selection of transfer switch products worldwide.
• ZTS Automatic Transfer Switches
40-4000 Amps
•
ZTSD Delayed Transition Transfer Switches
40-4000 Amps
•
ZTSCT Closed Transition Transfer Switches
100-4000 Amps
•
ZBTS Automatic Transfer/Bypass Switches
100-4000 Amps
•
ZBTSD Delayed Transition Bypass Switches
100-4000 Amps
•
ZBTSCT Closed Transition Bypass Switches
100-4000 Amps
All
ZTS products meet or exceed industry requirements
allowing specification and installation confidence.
• UL 1008 listed through 480 VAC
•
CSA C22.2 No. 178 listed through 600 VAC
• IEC 947-6-1 listed through 480 VAC
ZTS Series
Automatic Transfer Switches
• Codes and Standards
✓ NFPA 70, 99, 101, 110 ✓ IEEE 446, 241
✓ NEC 517, 700, 701, 702 ✓ NEMA ICS2-447
• Controls tested in accordance with:
✓ IEEE 472 (ANSI C37.90A)
✓ EN55022 Class B (CISPR 11)
(Exceeds
EN55011 & MILSTD 461 Class 3)
✓ EN
61000-4-2 (Level 4)
✓ EN61000-4-3 (ENV50140) 10 v/m
✓ EN61000-4-4
✓ EN
61000-4-5, IEEE C62.41 (1.2 X 50ms, 5
& 8 kV)
✓ EN61000-4-6 (ENV50141)
✓ EN61000-4-11
• Enclosures meet the requirements of:
✓ UL
508, 50
✓ ANSI
C33.76
✓ ICS
6
✓ NEMA
250
• Quality System:
✓ ISO 9001 Registered
Product Bulletin
GE Zenith Controls
e
Specification
Assistance
GE
Zenith offers a complete
range of product guide
specifications to help you
determine your needs.
For more information,
please consult your local
GE Zenith representative,
our factory or our website
at www.geindustrial.com.
Electrical Ratings
• Ratings 40 to 4000 amperes
• 2, 3 or 4 Poles
• Open type, NEMA 1,
3R, 4, 4X and 12
• Available to 600 VAC,
50 or 60 Hz
• Suitable for emergency and
standby applications on
all classes of load, 100%
tungsten rated through
400 amps
• UL 1008 listed at 480 VAC
• CSA C22.2 No. 178
certified at 600 VAC
• IEC 947-6-1 listed at 480 VAC
Performance Features
• Contact transfer speed
less than 100 milliseconds
• High close-in and
withstand capability
• Temperature rise test per
UL 1008 conducted after
overload and endurance
tests - exceeds UL
requirements
• Available in ZTS (utility-
generator), ZTSU (utilityutility), ZTSG (generatorgenerator) and ZTSM
(manual) configurations
Design and
Construction Features
• Double throw,
interlocked operation
• Electrically operated,
mechanically held by a
simple, over-center
mechanism
• Segmented silver tungsten
alloy contacts with
separate arcing contacts
on 225 amp and above
• Arc quenching grids,
enclosed arc chambers,
and wide contact air gap
for superior source-tosource isolation on all units
• Control circuit disconnect
plug and drive inhibit
switch for safe maintenance
• Components accessible
for inspection and
maintenance without
removal of the switch
or power conductors
• Mechanical indicator and
contact chamber cover
designed for inspection,
safety and position
designation
The ZTS Series is the building block
of our transfer switch product line.
This ruggedly built power contactor
family of switches has been specifically
designed for transfer switch duty with
dependability, versatility and user
friendliness of prime concern.
ZTS switches are available in open type construction
for switchboard installation or
NEMA enclosed to
the customer’s specifications. The power panel
components, consisting of power switching contacts,
drive mechanism and terminal lugs, are mounted
on a specially formed panel. Logic devices including
microprocessor control auxiliary time delays and
special accessory equipment are assembled on the
door for ease of maintenance and separation from the
power section. They are connected with a numbered
wiring harness equipped with a disconnect plug that
allows isolation of the control panel for maintenance.
ZTS Series Method of Operation
When the normal source voltage fails or drops to a
predetermined point (usually 80% of nominal), if
required, a circuit is closed to start the engine
generator set. When the emergency source reaches
90% of rated voltage and 95% of rated frequency, the
drive solenoid is energized through the emergency
coil control relay, causing the main contacts to
disconnect the load from the normal source and
connect it to the emergency source. After the drive
solenoid has completed its electrical stroke and is
seated, the emergency coil control relay opens to
disconnect it. The transfer switch is now mechanically
locked in the emergency position.
When normal voltage is restored to a predetermined
point (usually 90% of nominal), the control voltage
sensing energizes. The normal side coil relay closes,
and after the drive solenoid has completed its electrical
stroke and is seated, the coil control relay opens to
disconnect it. The transfer switch is now mechanically
locked in the normal position.
Drive Mechanism
All
GE Zenith ZTS switches employ the simple “over-
center” principle to achieve a mechanically locked
position in either normal or emergency and
GE Zenith’s
high speed drive assures contact transfer in 100 ms
or less. High contact pressure and positive mechanical
lock allow for high withstand and closing ratings, far
exceeding
UL requirements. All ZTS units are listed with
UL umbrella breaker, severe breaker and current
limiting fuse ratings.
ZTS Series
Automatic Transfer Switches
Neutral Switching
The
GE Zenith ZTS Series is available in true four pole
designs for multi-source power systems that require
neutral switching. The neutral contact is on the same
shaft as the associated main contacts. This ensures
positive operation, and avoids any possibility that
the neutral contact will fail to open or close, as is
possible when the neutral pole is an add-on accessory.
The neutral contacts are identical to the main contacts,
having the same current carrying and high withstand/
closing ratings as the mains. They are designed to
break last and make first to reduce the possibility of
transients while switching the neutral.
Safe Manual Operation
The
ZTS manual operator consists of a large, easy-to-use
handle that fits securely for manual operation during
installation and maintenance or in an emergency.
The
ZTS may be provided with an operator inhibit
switch to disconnect the electrical drive prior to
maintenance. Fully enclosed wrap-around arc covers
shield the main contacts and mechanical components,
preventing operator exposure during manual operation.
Transferring Large Motor
or Highly Inductive Loads
Some loads, especially large motors, receive severe
mechanical stress if power is trans-ferred out of phase
while the motor is still rotating. Also, back
EMF gener-
ated by a motor may result in excess currents that
can blow fuses or trip circuit breakers.
GE Zenith
offers four solutions to these problems:
PB-5066 •Page 2
1. Universal Motor
Disconnect (UMD): This load
control disconnects a large
motor via its control circuit
for an adjustable period of
time prior to transfer in either
direction. For switching multiple
motors, GE Zenith Accessory A62
disconnects the motors prior to
transfer and brings them back
on line sequentially.
2. Accessory R50: This is an
in-phase monitor that compares
the phase angle between both
sources of power and prevents
transfer until the two are approximately in phase (within a self
adjusting range). GE Zenith’s
high speed transfer action
coupled with the MX series
microprocessor control logic
ensure closures at or near
zero degree phase difference.
3. Series ZTSD: GE Zenith
offers delayed transition
switching on transfer switches
rated 40 amperes and above –
the GE Zenith ZTSD Series. This
programmed center-off position
allows for the full decay of
rotating motors or transformer
fields. It can also be used for
load shedding of selected
circuits or other appli-cations
which require a means to
disconnect the load from either
source. Major UPS system manufacturers recommend delayed
transition switches for proper
restart sequencing of their systems.
4. Series ZTSCT: GE Zenith’s
series of closed transition switches
combine ZTSD operation during
a source failure with a highly
engineered control system that
allows momentary paralleling
(100 ms) of two acceptable
sources, thereby limiting the
impact of transfer on the load.
MX250 series
Microprocessor Controller
P
age 3 • PB-5066
LEDs are used in a recognizable line configuration
for continuous monitoring of switch position. A new
LCD display shows source availability, exercise time
delay operation and system source condition. A new
simplified adjustment is featured for voltage, frequency
and time delay settings.
The control operates off a close differential 3
phase under-voltage sensing of source 1, factory
standard setting 90% pickup, 80% dropout; underfrequency sensing of source 1 factory setting 95%
pickup; voltage and frequency sensing of source 2,
factory standard setting 90% pickup voltage, 95%
pickup frequency. All factory settings are operator
adjustable (see table below).
A test is standard (fast test/load/no load) to
simulate source 1 failure - automatically bypassed
should source 2 fail.
More Enhanced Features
• Available in ALL transfer modes:
~ Open, Delayed & Bypass
~ Closed (with newly integrated transition control)
• User-friendly programmable engine exerciser,
used for the engine generator with or without
load, at ANY interval in a one-year period
• Operating voltages available in a single
controller for most domestic and international
applications
• Real-time display of ATS status, including
active timer(s)
• Multiple levels of user-defined password
protection
• Serial communications allowing connectivity
with other ATS's, paralleling switchgear, and
SCADA systems
• Time-tested synchronous logic automatically
measures phase angle and frequency allowing
disturbance-free transfer
• Unsurpassed statistical ATS/System monitoring
available in real-time
• T3/W3 elevator pre-signal. Automatically
bypassed if the selected source fails, minimizing
time an elevator is without power
• Universal Motor Disconnect (UMD) sends
a pre-signal, post-signal or both to any motor
control center. Not bypassed in an outage,
the UMD ensures safety in the event of a
single phase loss
• Voltage unbalance detection standard
• Extensive 2/5/10 Warranty
Performance Features
• UL, CSA and IEC listed
• Ringing wave immunity per IEEE 472 (ANSI C37.90A)
• Condusted and Radiated Emissions per EN55022 Class B
(CISPR 11) (Exceeds EN55011 & MILSTD 461 Class 3)
• ESD Immunity test per EN61000-4-2 (Level 4)
• Radiated RF, electromagnetic field immunity test
per EN61000-4-3 (ENV50140) 10v/m
• Electrical fast transient/burst immunity test
for EN61000-4-4
• Surge immunity test per EN61000-4-5 IEEE C62.41
(1.2 x 50ms, 5 & 8 kV)
• Conducted immunity test per EN61000-4-6 (ENV50141)
• Voltage dips and interruption immunity EN61000-4-11
Technical Benefits
• Separate line voltage components for controller isolation
• Inputs optoisolated for high electrical immunity to transients and noise
• Built-in electrical operator protection
• Simplified maintenance – major components are easily replaceable
• Close differential under-voltage sensing of the normal source
• Voltage and frequency sensing of the emergency source
(all settings are adjustable)
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