SECTION 3
INSTALLATION AND INITIAL TURN-ON
PV-15208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2000, Xantrex Technologies Inc./Trace Technologies Corp.
DOCUMENT: 150919
3-1
ISOLATION TRANSFORMER REQUIREMENTS
The PV-15208 is required to have an isolation transformer wired between the inverter AC output and
the utility interconnection. Any standard dry-type isolation transformer is compatible with the PV-15208
as long as the inverter side is rated for a minimum of 15KVA continuous duty.
Inverter Side Isolation Transformer Requirements
The inverter side transformer windings may be configured either delta or WYE, and must be rated for
208 VAC. Trace Technologies recommends using a delta wound transformer to avoid installation mis-
takes. If a WYE wound transformer is used to interface with the PV-15208, and the PV array is
grounded, the neutral (X0) must be left floating. If the neutral is tied to ground, the inverter will not
function properly, and may be damaged.
Utility Side Isolation Transformer Requirements
The utility side isolation transformer windings may be configured either delta or WYE, and must be
rated for the utility voltage at the point of utility inter-connection. Check with the utility of jurisdiction
when selecting an isolation transformer configuration. If a WYE wound transformer is used to interface
with the utility, it is not necessary to connect the neutral (X0) to ground. The PV-15208 is a balanced,
three phase, current sourcing inverter, and only operates with the presence of a stable utility voltage.
Single phase grounded loads which may be present between the transformer and utility, will maintain
their existing ground reference at the utility distribution transformer. Grounding the neutral of a WYE
wound transformer may create an “open delta” condition, depending on the utility configuration. This
condition may keep the PV-15208 from detecting a loss of phase condition on the utility system,
which may allow potentially lethal voltage to be present on the open phase wiring.
Contact your Xantrex/Trace Technologies distributor if you have any questions regarding isolation trans-
former requirements.
Check with the local utility of jurisdiction when selecting the winding configura-
tion of the isolation transformer. Individual utilities may have unique require-
ments related to isolation transformer wiring. Some winding configurations may
keep the PV-15208 from detecting a loss of phase condition on the utility system
which may allow potentially lethal voltage to be present on the open phase wir-
ings.
WARNING
TORQUE AND WIRE GAUGE SPECIFICATIONS
The following torque specifications are to be used on all electrical interfaces made during installation of
the PV-15208.
e
z
i
S
t
l
o
B
r
o
k
c
o
l
B
l
a
n
i
m
r
e
T
g
n
i
t
t
e
S
e
u
q
r
o
T
1
-
6
M
m
N
9
.
5
/
.
s
b
l
n
i
2
5
2
3
1
2
6
t
u
m
w
a
h
S
/
z
a
r
r
e
F
m
N
6
.
3
1
-
3
.
2
/
s
b
l
n
i
0
2
1
-
0
2
Torque Table
