Generac Power Systems HTS Wn, Owner'S Manual

Page: 5 / 56

3
Section 1 — General Information
HTS “Wn” Type Transfer Switch
For the power source to be available, the associated service dis-
connect circuit breaker must be ON, the associated TVSS discon-
nect circuit breaker must be ON and the associated source must
be present.
The LED status indicators can be viewed directly on the TVSS
module with the enclosure door open.
1.3.6 REMOTE ALARM CONTACTS
‹
Each TVSS module is equipped with a set of alarm contacts to
indicate the TVSS module protection status, to a external alarm.
This is available as a full set of dry relay contacts (C, NO, NC).
The contact ratings are; 3A, 250Vdc or 230Vac maximum. The
contacts are wired to a three position terminal strip for customer
connection.
If the contacts change state, it indicates either a power failure to
the TVSS module or a failure of the TVSS module.
1.4 COMMUNICATIONS
The HTS acts as a Modbus slave on the communications network.
For the "H" series of generator controllers, Port 1 should be used
for a connection. On the "G" series of controllers, Port 0 should be
used. The base Modbus address for the transfer switch is set at
240 but can be modified using dip switches DIP1 - switches 7 and
8. Unless there are two transfer switches on the network, these
switches can be left in the OFF position.
Communications parameters on the Power Manager should be
set to:
Modbus Master Port •
4800 Baud •
No parity, 2 stop bits •
The Network uses Modbus RTU protocol. Communications are
sent at a one second rate. If no Good messages are received
within 20 seconds, the communications link is determined to be
bad and the switch controller will revert to local control. If the link
re-establishes itself the remote control from the H-panel restarts
(Figure 1.1).
Figure 1.1 - Typical Communication Network
H/G Panel
(Master)
PORT 1 (H) or 0 (G)
Remote
Annunciator
(Slave)
H Transfer
Switch
(Slave)
GenLink
via PC
RS485
Remote
Annunciator
(Slave)
1.5 OPERATION WITH LOSS OF
COMMUNICATIONS
Local control means that if the generator is running and there is no
utility, the switch will then transfer to the generator. If utility returns,
the switch will transfer back to utility. The generator will not start or
stop automatically as it cannot communicate with the switch and
does not know utility is missing. It will have to be manually started
and stopped (with the keyswitch set in the manual position).
1.6 TRANSFER SWITCH DATA
LABEL
A Data LABEL is permanently affixed to the transfer switch enclo-
sure. Use this transfer switch only with the specific limits shown
on the DATA LABEL and on other decals and labels that may be
affixed to the switch. This will prevent damage to equipment and
property.
When requesting information or ordering parts for this equipment,
make sure to include all information from the DATA LABEL.
Record the Model and Serial numbers in the space provided for
future reference.
MODEL #
SERIAL #
1.7 TRANSFER SWITCH
ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer’s
Association (NEMA) 12 type. NEMA 12 type enclosures primarily
provide protection against contact with the enclosed equipment
and provide a degree of protection against dust, falling dirt, and
dripping non-corrosive liquids. NEMA 12 type enclosures are for
indoor use only.
1.8 SAFE USE OF TRANSFER
SWITCH
Before installing, operating or servicing this equipment, read the
SAFETY RULES (inside front cover) carefully. Comply strictly
with all SAFETY RULES to prevent accidents and/or damage to
the equipment. The manufacturer recommends that a copy of the
SAFETY RULES be posted near the transfer switch. Also, be sure
to read all instructions and information found on tags, labels and
decals affixed to the equipment.
The publications that outline the safe use of transfer switches are
the following:
NFPA 70; National Electrical Code •
NFPA 70E; Standard for Electrical Safety in the Workplace •
UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER •
SWITCHES