General Information; Introduction; Equipment Description - Generac Power Systems TTS series Owner's Manual

General Information

1.1 INTRODUCTION

This manual has been prepared especially for the purpose of famil-
iarizing personnel with the design, application, installation, opera-
tion and servicing of the applicable equipment. Read this manual
carefully and comply with all instructions. This will help to prevent
accidents or damage to equipment that might otherwise be caused
by carelessness, incorrect application, or improper procedures.
Every effort has been expended to make sure that the contents
of this manual are both accurate and current. The manufacturer,
however, reserves the right to change, alter or otherwise improve
the product at any time without prior notice.

1.2 EQUIPMENT DESCRIPTION

This Telecom Transfer Switch (TAS) is a combination of individual
components that perform four basic functions.
1.2.1 MANUAL GENERATOR SELECTION SWITCH
This unit is equipped with inputs for two generator sources,
On-site and Secondary (Figure 1). Only one generator input can be
selected at a time due to an interlocking mechanism. This manual
transfer switch can be accessed from the enclosure door and the
connected generator supply is indicated on the Human Machine
Interface screen (HMI).
Figure 1 — Manual Generator Selection Swtich
1.2.2 TRANSIENT VOLTAGE SURGE SUPPRESSION
The Transient Voltage Surge Suppression (TVSS) is provided to
protect the load from electrical surges and/or transient voltage
spikes. This device is physically located next to the transfer switch
and electrically connected to the load side of the transfer switch.
The TVSS is made up of multiple solid state Metal Oxide Varistors
(MOV) connected in parallel for each mode of protection. These
devices are equipped with integrated short circuit and individual
component level fusing. They are self-reseting and fully automatic.
2
Modes of Protection
The TVSS provides protection on all modes:
• Single Phase (6): L-L, L-N, L-N, L-G, L-G and N-G.
• Three Phase (10): L-L, L-L, L-L, L-N, L-N, L-N, L-G, L-G, L-G
and N-G.
Ratings
• Surge Capacity: 80 kA L-N, L-G and N-G, 160 kA L-L.
• Suppression Level (typical):
L-N = 330 V
L-G = 400 V
N-G = 400V
L-L = 700 V
Certification
The TVSS is UL recognized to the requirements of UL 1449 3rd
edition.

REPLACEMENT OF THE TVSS MODULE WHILE
THE ATS IS ENERGIZED SHOULD ONLY BE
PERFORMED BY A QUALIFIED ELECTRICIAN.
STATUS INDICATORS
Each TVSS module has comprehensive, solid state, continual
visual status monitoring of each protection mode present. There
are two LED's provided, located on the cover of the module. The
GREEN LED (ground present) is used to indicate that the TVSS
module is energized and in working order. The RED LED (fault
warning) will turn on in the event the suppressor capability is
exceeded or if there is an internal safety component activating.
When the power is first applied, the unit does a brief internal diag-
nostic test. During this test, the RED LED will illuminate briefly, go
off and then the GREEN LED will illuminate.
The LED status indicators can be viewed directly on the TVSS
module with the enclosure door open.
REMOTE ALARM CONTACTS
Each TVSS module is equipped with a set of alarm contacts to
indicate the TVSS module protection status. The TVSS status is
displayed on the door mounted HMI screen (Figure 21).
1.2.3 AUTOMATIC TRANSFER SWITCH
The automatic transfer switch is used for transferring critical elec-
trical load from a NORMAL (UTILITY) power source to a STANDBY
(EMERGENCY) power source. Such a transfer of electrical loads
occurs automatically when the NORMAL power source has failed
or is substantially reduced and the STANDBY source voltage and
frequency have reached an acceptable level. The transfer switch
prevents electrical feedback between two different power sources
(such as the NORMAL and STANDBY sources) and, for that rea-
son, codes require it in all standby electric system installations.
This switch is suitable for control of motors, electric discharge
lamps, tungsten filament and electric heating equipment and the
tungsten load does not exceed 30% of the switch rating.