Hoffman Controls Model 610 Series - Sequence of Operation

16
as phase imbalance, phase order, or temperature out of range,
correct the problem(s) before re-applying line voltage to the motor
contactor(s).
13)
R
efer to this I&O's
Refer to this I&O's R
Installation
section (on pages 3 thru 9
and 12 thru 15) and
the appropriate wiring diagram(s)
to
trouble
shoot and correct the problem(s) that allowed the motor to keep
running after a
TRIP
occurred. After each repair, the installer
must
repeat this entire
Initial Checkout Procedure
section (pages
16 - 19) to ensure the repair fixed the problem(s).
14)
Once the Model 610 Digital Current Monitor(s) and motor
contactor(s) is /are working correctly, the installer can
c
hange the
current trip level to the desired value for the application, (typi-
cally motor FLA + 8% [
FLA
times
FLA times FLA
1.08
). See steps 1 thru 5 in the
“
Sequence of Operation
” section (pgs 16 & 17) for the procedure.
You may now manually reset the Over Current Trip by pressing
the
MODE
button once and then the
MODE button once and then the MODE
ENTER
button once.
ENTER button once.ENTER
If a three (3) phase motor runs backwards, the installer must
turn off line power to the motor and 24 VAC to the Model 610,
then swap the
L1
and
L2
wires going to the motor and also swap
the
CT1
+
and
CT2
+
wires at the Model 610’s terminal block.
NOTE:
Phase order verification can be turned off, using the
menu system. Refer to the
Sequence of Operation
section (pages
16 & 17)
,
steps 1 thru
7
, for the details
The two
Model 610 Digital Current Monitors, P/N Model
610-1PH(MOD) & P/N Model 610-3PH(MOD)
contain a
Modbus Slave that responds to a Modbus Master, which can send
requests to read the Model 610's internal register data or write
new data into the 610's internal registers. The Modbus connection
to the controller is an industry-standard three wire Modbus RTU
(Remote Terminal Unit) RS-485 serial data link that can be shared
with other modbus capable controllers and sensors.
T
here are 32 Modbus internal data registers (numbered 0 - 31)
available in this controller, as listed in
Tables 6A & 6B
,
Model
610 Modbus Register Data Information,
on pages 13 & 14. Each
Modbus register contains 16 data bits which can be updated using:
•
Modbus command 03, to read the data from one or more,
of the 610's internal data registers at a time.
•
Modbus command 16 (hexadecimal 10), to write data to
one or
more
of the
internal data registers at a time.
•
Modbus command 06, to write data to a single internal
data register.
To update any or a
ll of the Model 610 Digital Current Mon-
itor's mode, menu and submenu parameters and numerical
values
remotely, proceed with the following steps
:
• Set MODBUS RTU
slave
address, baud rate and parity for
each
Model 610
slave installed.
•
Write to each slave using the
TABLE
6A & 6B
informa
tion (pages 1
3
& 1
4
) to select the
Model
610
's internal
register numbers and associated data, as required, to set up
the
Model 610
monitor
's operating parameters and numer
ical
values
.
•
Allow
the
Allow the Allow
Model 610
to
operat
e
for a brief period of time
before reviewing all the data contained in the 32 internal
registers
, to ensure correct operation.
The default Modbus settings, stored within the controller, are:
• Modbus slave address = 1.
• Baud rate = 19200.
• Even parity.
Refer to
Figure 6
,
the "
Model 61
0
Menu System Flow Chart
"
on pages
10 & 11
, or follow the steps below to review or update
any or all the parameters and numerical values used by the Model
610. All settings and values are stored and saved within the control-
ler's memory.
1.
With line power, to the motor contactor, turned off and with
24VAC power applied to the Model 610
controller
:
• Verify no error messages are displayed on the LCD.
•
Verify t
he LCD screen shows
0.0
amps.
2.
Press the
MODE
button twice. The display should indicate
MODE button twice. The display should indicate MODE
“
Current Trip Settings
.”
3.
Press the
ENTER
button. The display should indicate
ENTER button. The display should indicate ENTER
“
Number of Phases
.”
4.
Use the
UP
and
DOWN
buttons to select the number of
current transformer phases that are connected to the controller.
Range is
"
3 Phase",
"Single Phase"
or
"
0 Phase; Temp only"
. Use
"
0 Phase; Temp only
"
when
only
temperature sensing is desired.
Then press the
ENTER
button. The default is
ENTER button. The default is ENTER
3
P
hase
.
5.
The display should read: “
Set Trip Level in Amps
”. Use the
Sequence of Operation
Initial Checkout Con't
IMPORTANT:
If any of the down loaded Modbus data is incorrect, the
Model 610 Digital Current Monitor's microcontroller
will change the incorrect data into software selected
default values during the Model 610's next operating
cycle. Therefore, after updating any data remotel
y,
cycle. Therefore, after updating any data remotely,cycle. Therefore, after updating any data remotel
th
e
operator
MUST
allow the Model 610 to operate
for a
brief time period
before reviewing ALL of the data con-
brief time period before reviewing ALL of the data con-brief time period
tained in each of the
Model 610
's
3
2
register addresses
to 1) ensure that all of the operating parameters and
numerical values, needed for the application, have been
correctly selected and 2) also ensure that any unneeded
or undesired options or numerical values have not
inadvertently been left selected.
�
NOTE:
Phase imbalance can be caused when single phase
loads are not distributed evenly throughout a 3
phase power network.
Modbus RTU Operation