Generac Power Systems GTS "W", Руководство пользователя

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4 Generac ® Power Systems, Inc.
2.4.3 4-POLE MECHANISM
This switch (Figure 2.3) is used with a 3-phase system,
when the NEUTRAL line is to be switched during trans-
fer action.
Figure 2.3 — Typical 4-Pole Transfer Mechanism
(400 Amp Shown)
All power voltage supplies must be turned off
before attempting to connect power source and
load lines. Failure to turn off power voltage
supplies will result in extremely dangerous and
possibly lethal electrical shock.
All power cables should enter the switch next to the
transfer mechanism terminals. Standard terminal lugs
on the transfer mechanism are solderless, screwtype.
Connect power source and load conductors to clearly
marked terminal lugs on transfer mechanism as fol-
lows:
• LOAD leads: Connect to terminals T1, T2, T3, & T4*.
• NORMAL (utility) Source Leads: To terminals N1, N2,
N3, & N4*.
• STANDBY (emergency) Source Leads: Connect to
transfer mechanism terminal lugs E1, E2, E3, & E4*.
* The connection diagram (Figure 2.4) shows a typi-
cal 3-phase installation without switched neutral.
T4, N4, and E4 are not used.
NOTE:
Unless otherwise specified, a NEUTRAL block is not
supplied with transfer switch on single phase, 3-pole
units where the NEUTRAL line is to be switched dur-
ing transfer action. Similarly, a NEUTRAL block is
not supplied on 3-phase, 4-pole units where the
NEUTRAL line is to be switched during transfer.
Solderless, screw-type terminal lugs are standard.
Conductor sizes must be adequate to handle the maxi-
mum current to which they will be subjected; based on
the 75°C column of tables, charts, etc. used to size con-
ductors. The installation must comply fully with all
applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove
any surface oxides from the cable ends with a wire
brush. If ALUMINUM conductors are used, apply cor-
rosion inhibitor to conductors. After tightening termi-
nal lugs, carefully wipe away any excess corrosion
inhibitor.
Tighten terminal lugs to the torque values as noted
inside the transfer switch door.
Use a torque wrench to tighten the conductors,
being sure not to overtighten, or damage to the
switch base could occur. If undertightened, a
loose connection would result, causing excess
heat which could damage the switch base.
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; at least 1 inch for cir-
cuits over 400 amps.
2.5 CONNECTING START CIRCUIT
WIRES
Connect suitable, approved wiring to transfer switch
terminals 178 and 183 (see chart below). Route these
wires through suitable, approved conduit and connect
to identically numbered terminals in the AC connection
(lower) panel of Generac power systems (engine-genera-
tor set). See Figure 2.4.
Closure of Wire 178/183 circuit by switch circuit action
must result in generator engine cranking and startup.
NOTE:
The preceding applies to the standard 2-WIRE
START SYSTEM. If a generator having a 3-WIRE
START SYSTEM is to be installed, using the option-
al 3-wire start system. See TRANSFER SWITCH
OPTIONS, Section 3.15.
!
DANGER
XXXXXX
64783
RATED CURRENT
TRANSFER SWITCH
RATED VOLTAGE
600 VAC CSA
480 VAC UL
400 AMP
OFF
STANDBY
B
A
UTILITY
ON
T3
E2
E3
T4
E4
◆
Section 2 — Installation
Generac GTS “W” Type Transfer Switch
Switch Rating Wire Range
100A #6-2/0 AWG
150-200A #4-400 MCM
300-400A (1) #4-600 MCM or
(2) 1/0-250 MCM