Connecting Power Source And Load Lines; Connecting Start Circuit Wires; Connecting Load Shed Module (Lsm) Connection; Sequence Of Operation - Generac Power Systems RTS automatic Technical Manual

Installation
Install the transfer switch as close as possible to the electrical
loads that are to be connected to it. Mount the switch vertically to
a rigid supporting structure. To prevent switch distortion, level all
mounting points. If necessary, use washers behind mounting holes
to level the unit.
2.3 CONNECTING POWER SOURCE
AND LOAD LINES
   M ake sure to turn OFF both the UTILITY

(NORMAL) and GENERATOR (STANDBY)
power supplies before trying to connect power
source and load lines to the transfer switch.
Supply voltages are extremely high and dan-
gerous. Contact with such high voltage power
supply lines causes extremely hazardous, pos-
sibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual.
All installations must comply with national, state and local
codes. It is the responsibility of the installer to perform an
installation that will pass the final electrical inspection.
The utility supply connection is made at the UTILITY SERVICE DIS-
CONNECT circuit breaker terminals. The generator and customer
load connections are made at the transfer switch mechanism,
inside the switch enclosure.
Conductor sizes must be adequate to handle the maximum cur-
rent to which they will be subjected, based on the 75°C column of
tables, charts, etc. used to size conductors. The installation must
comply fully with all applicable codes, standards and regulations.
All power cables must enter the enclosure through the knockouts
provided. If not using the knockouts, conduit entry into the enclo-
sure must be at or below knockouts to maintain the Type 3R rating.
Conduits should be arranged to provide separation between the
Utility and Generator supply conductors inside the enclosure.
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. If ALUMINUM con-
ductors are used, apply corrosion inhibitor to conductors. Tighten
terminal lugs to the torque values on "Utility Service Disconnect
Circuit Breaker", and on the decal located on the inside of the door.
After tightening terminal lugs, carefully wipe away any excess cor-
rosion inhibitor.
Use a torque wrench to tighten the conductors,

being sure not to overtighten, or damage to
the switch base could occur. If not tightened
enough, a loose connection would result,
causing excess heat which could damage the
switch base.
4
NOTE:
Connect power source load conductors to clearly marked transfer
mechanism terminal lugs as follows
1. Connect UTILITY (NORMAL) power source cables to UTILITY
SERVICE DISCONNECT circuit breaker.
2. Connect the GENERATOR (STANDBY) source power cables to
switch terminals E1, E2.
3. Connect customer LOAD leads to switch terminals T1, T2.
Conductors must be properly supported, of approved insulative
qualities, protected by approved conduit, and of the correct wire
gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal
parts and grounded metal. Allow at least 1/2 inch for 100-400
amp circuits.
2.4 CONNECTING START CIRCUIT
WIRES
Control system interconnections (Electrical Data section) consist
of UTILITY 1 (N1), UTILITY 2 (N2) and LOAD (T1), and leads 23, 0
and 194. Recommended wire gauge sizes for this wiring depends
on the length of the wire, as recommended in the following chart:
MAXIMUM WIRE LENGTH
460 feet (140m)
461 to 730 feet (223m)
731 to 1,160 feet (354m)
1,161 to 1,850 feet (565m)
2.5 CONNECTING LOAD SHED
MODULE (LSM) CONNECTION
The LSM can control an air conditioner (24 Vac) directly or a sepa-
rate contactor (120 Vac) which can control any load connected to
it. See Figure 2.1.

2.5.1 SEQUENCE OF OPERATION

The 4 green status LEDs will indicate when a load priority level is
enabled.
• All loads are enabled when the transfer signal is off. (ATS in
Utility position).
• If the transfer signal is pulled low (Active)
• All loads are enabled until an overload is detected
• When an overload is detected all loads are disabled
• After 5 minutes priority 1 loads are enabled.
• After another 30 seconds priority 2 loads are enabled
• After another 30 seconds priority 3 loads are enabled
• After another 30 seconds priority 4 loads are enabled
If an overload is detected within 30 seconds of a level being
enabled, all loads are disabled again and the sequence repeats.
However, the level that caused the overload and all levels higher
will not be enabled again for 30 minutes.
RECOMMENDED WIRE
SIZE
No. 18 AWG.
No. 16 AWG.
No. 14 AWG.
No. 12 AWG.