Hoffman Controls 610 Series - Page 4

1
.
D
i
sable
all line power goin
g to
the motor contactor and
motor.
2
.
Refer to
Installation
Section step
8
to attach wires to three (3)
CTs.
3.
R
efer to
Refer to R
Figure 2, "Current Transform
er Alignment"
(above) to install the three (3) current transformers. Clamp a single
current transformer on each of the three (3) power wires connected
to the m
otor. The sides of the current transformers, with the white
text printed on the CT's case,
must
all be pointed in the same
must all be pointed in the same must
direction (CT signals in phase).
4
.
Spacing between the 3 adjacent CTs, shown in
Figure
2
, is
not critical.
5
.
Referring to
Figure 2
and
Figure 4, "Model 610 3 Phase
Wiring Diagram"
(
page 5)
,
connect the current transformer's
wires to the Model 610 Digital Current Monitor's CT terminals
a
s
shown in
Table 1
on page 5
.
6
.
Connect 24VAC power, as shown in
Figure
4
“
Model 610, 3
Phase Wiring Diagram
” (above).
7
.
Connect
the
TRIP
relay's
N.C.
terminal to a 24 VAC source
as shown in
Figure
4
.
7.
The Model 610 uses Clamp-On Current Transformers (CTs)
to monitor the current flowing through each motor's power
wire that is equipped with a current transformer. The CTs are
installed as shown in
Figure
2
. When more then one (1) CT is
used to monitor motor
(
load) current, all
the installed CTs must
be oriented in the same direction, as shown in
Figure
2
,
Current
Transformer Alignment
(below)
Transformer Alignment (below)Transformer Alignment
to provide accurate in-phase
information.
8.
For each installed CT;
a
.
Remove plastic tab shown on CT's bottom, pictured
in
Figure 3A "Two Current Traneformer's Bottoms",
by pinching
tab between a finger and small screw driver blade then twisting.
The tab will fly off if removed with only the screw driver blade.
b.
Cut
required length of
supplied 12 foot long
required length of supplied 12 foot long required length of
red
and
black
twisted pair wire to reach between the CT and the Model
610's
CT1
+/-
,
CT2
+/-
and
CT3
+/-
terminals.
c.
I
f additional CT wire is needed, use 22 AWG (mini-
mum) stranded, twisted pair cable properly insulated for the
application. The maximum length of additional
wire is 100 feet.
d
.
Attach one end of the black
twisted pair
wire to the
CT's "
Lc
" terminal shown in
Figure 3B
. Attach one end of the
red
twisted pair
wire to the CT's "
L
" terminal
shown in
Figure 3B
.
Replace the plastic tab removed in sub-step
a
.
above.
To protect 3 phase across-the-line motors, proce
ed with the
3
Phase, Across-the-Line, Motor Installation
section below.
To protect single phase motors, proceed to the
Single Phase
Motor Installation
section on page 5.
To protect 3 phase part (split) winding motors, proce
ed with the
P
art (Split) Winding
Motor
Information
section on page 6.
To monitor compressor temperatures, proceed to the
Com-
pressor Temperature Sensing Information
section on page 12.
To operate the Model 610 remotely, proceed to the
Modbus
RTU Installtion
section on page 15.
4
3 Phase, Across the Line,
Motor Installation
WARNING:
Disconnect power from the motor(s) and ensure the motor(s)
is/are electrically disabled prior to the Model 610 Digital
Current Monitor's installation.
Installation Con't
WARNING:
Current Transformer wires
must
be c
must be cmust
onnected to
the Model 610 Digital Current Monitor's terminal
block before operation of the motor. The Current
Transformers will generate high voltages if the wires
are left unconnected (open circuited).
Current Transformer Alignment
Figure 2







Two Current Transformer's Bottoms
Figure
3