Seametrics FT520-84 Instruction Manual

FT520-84 Regeneration
Control Instructions

General Information

The FT520-84 is a version of the SeaMetrics flow
processor specially designed for regeneration control.
On the input side, it can be used with SeaMetrics flow
sensors and meters, as well as with water meters from
other manufacturers. The output can be used to initiate
regeneration in a variety of one-tank and two-tank water
treatment systems. In addition to the regeneration
functions, this unit features displays of flow rate and
accumulated flow, as well as programmable pulse output
and a 4-20 mA analog output, for use with remote
recorders.

There are two regeneration relays, which can be used
for alternating regeneration of two tanks. The outputs
remain on for a duration programmed by the user,
depending on the requirements of the regeneration valve
being used.

A programmable pulse output can be used as needed to
control a chemical metering pump, for controlled chem­ical addition to the water stream.

Specifications

Power 115 VAC (220 VAC optional)

50/60 Hz; 12-24 VDC

Temperature 32° - 130° F (0° - 55° C)
Enclosure Precision cast aluminum,

NEMA 4X

Initiation Outputs Two Form C SPDT relay,

115 VAC 5A max

Max Pulse Output 100 mA at 60 VDC
Memory Type Non-volatile EEPROM

auto-backup

Sensor Power 12 VDC, 10 mA
Totalizer 8 digit
Rate Display 5 digit
V olume Units Gallons, cubic feet, cubic

meters, liters, million gallons

Output Time 1-999 Seconds
Analog Output 4-20 mA, 0-5 VDC, 0-10 VDC,

opto-isolated

Sensor Input Open collector current sink,

ESD protected

Max Input Frequency 1,000 Hz
Shipping Weight 7 lbs

Features

Easy-read

backlit display

Remote control terminals

(inside housing)

Rugged cast aluminum

housing

(wall or panel mount)

Regeneration volume

counts down

SET REGEN. VOL.

1000.00 GAL

Regeneration

initiation

Chemical pump

pulse LED

LT-10830-C

Page 1 of 4

Installation

Wall Mounting. Using the four screws provided, attach

the two foot brackets to the sides of the enclosure. Then
attach the unit to any secure surface by inserting screws
through the mounting holes in the foot brackets.

Panel Mounting. Follow the dimensions given for
“Panel Cutout”. Be sure to include the four corner screw
holes. After cutting and drilling, place the front plate on
the front side of the panel with its gasket against the
panel, and the remainder of the square housing on the
back side. Slide the screws through the four holes drilled
in the panel, and into the threaded holes in the housing.
Tighten until the gasket is firmly compressed against the
panel.

Expose T erminals. Remove the four screws which hold
the front plate to its flange. Remove the front plate. The
display board is attached to this front plate. It is also
connected to the power board by a ribbon cable. For
convenience, this cable can be disconnected while
making connections. Connections can be made inside
the enclosure, or the terminals can be unplugged for
easier access, by gently tugging on them.

Caution: When the control is
powered up, relay or analog out­puts may be present. If this

!

Sensor Connection. Follow the “Connections” diagram
to connect either two or three wires from the flow meter
or flow sensor.

could be a hazard, wait to make
external connections until pro­gramming is complete.

desired to the appropriate terminals. For safety, if using
AC power, be sure to connect the ground terminal
provided to a good earth ground. If using 12 VDC, use
a Seametrics PC3 or equivalent 12 VDC 500 mA power
supply.

Displays

SETTINGS

FLOW

SET

RATE

SET DECIMAL

SET

SET K-FACTOR

SET

SET PULSE OUT

SET

.00 GAL

SET 20mA RATE

SET

0.00 GPM

SET REGEN. VOL.

SET

1000.00 GAL
SET REGEN. TIME

SET

5 SEC'S

SET RELAY MODE

SET

ALTERNATE RELAYS

TO CLEAR TOTAL

SET

PRESS UP & LEFT

return to

SET

operation mode

GAL

MINUTE

0.00 GPM

1.000

OPERATION MODE

0.00 GPM

OR

O.00 GAL

0.00 GPM
O.00 GAL

T

Running
Totalizer

T = Total

Volume
counts down

Replace the front panel, taking care to reconnect the
ribbon cable. When power is switched on, the display
should light up immediately with meaningful letters or
digits.

Settings

Regeneration Valve Connection. Connect the leads

which initiate the regeneration valve(s) to the terminals
marked Relay 1 and Relay 2. (See “Connections” dia­gram.) If only one unit is being connected, use Relay 1.
(Relay 2 will operate only if “Alternate Relays” mode is
used.)

Analog Connection. This output can be configured 4­20 mA, 0-10 V or 0-5 V by placing a jumper in the cor­rect position on the analog header. The switch next to
the header selects active (powered) or passive
(unpowered) output. When using the 12 VDC powered
input you may only select passive output.

Power Connection. Connect AC or DC power as

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Set Flow Rate. Press . Use to select volume
units. Use to select the particular unit desired (gallons,
liters, etc.). Then use to switch to time units. Again,
select the units desired. Press to move to the next
menu item.

Set Decimal. Use to select zero, one, or two decimal
places on the flow units. Press to move to the next
menu item.

Set K-Factor. The unit will not function properly until
this number is entered. It is simply the number of pulses
which the flow meter or flow sensor puts out per gallon
of liquid. It is marked on the Model/Serial tag of

SeaMetrics flow meters and flow sensor fittings. On
adjustable flow sensors, the K-factor must be taken from
the chart in the flow sensor instructions, based on pipe
size. Set the number with and . The underlined
digit is the one being set. moves one digit to the left
and increases the digit. When the appropriate number
has been set, press again to move to the next menu
item.

Set Pulse Out. An output pulse is activated at the
selected volume intervals if this feature is in use.
Otherwise, it does not need to be set. Press to move
to the next menu item.

Set 20 mA Out. The “SET 20mA RATE” programs the
flow rate at which the output is 20 mA, 5 V or 10 V . Use

and to set the maximum flow rate desired for full

scale output. Press

for next menu item.

regeneration. Using , set for slightly over the minimum
time required by the regeneration valve to begin a cycle.
Press to move to the next menu item.

Set Relay Mode. Choose between single relay (Relay
No. 1) and dual relay (Alternate Relays) operation, using
. In alternate relay mode, the first regeneration will
use relay 1, the next will use relay 2, and successive
regenerations will switch between the two. Press to
move to the next menu item.

Clear T otal. This function resets the running total back
to zero. It is unrelated to the regeneration function, and
can be ignored unless it is needed. To reset to zero,
press and simultaneously. Press to return to
operation mode.

Operation

Set Regeneration Volume. This is the volume (in the

units you have selected; typically gallons) at which the
relay energizes to initiate a regeneration cycle. Set to

the desired amount using and . Press

to move

to the next menu item.

Set Regeneration Time. This is the length of time in
seconds that the relay remains energized to initiate

Connections

Pulse Outputs

(for metering pumps)

Regeneration Outputs

AC Power

Alternate

12 VDC power

PC1 power supply

P/N 05040

Pulse 1

Pulse 2

Relay 1

Relay 2

Main

power fuse

250mA

part # 26926

Line
Neutral
Ground

Customer Supplies
1A Fuse

NO
COM

NC
NO

COM

NC

+

–

Choice of Displays. When all of the settings have been
entered, the next press of the SET Key puts the unit in
operation. If a T appears at the left side of the display,
the values shown are flow rate and running total. If there
is no T, the values shown are flow rate and units
remaining until regeneration. The total increases with
flow, and the regeneration quantity counts down. Use
to choose the preferred display , usually regeneration

Ribbon connector

from display board

4-20mA

5V

10V

Jumpers

Analog Header

RESUME

COM

BATCH

Active

A
P

Passive

+

s1

–

s2

+
–

Analog Switch

A
B

An Output

RED

WHITE

BLACK

Resume
Start/Stop

Power
Signal

Ground

0-5 V or
0-10 V or
4-20 mA

Remote
Controls

Dry contact

Meter

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quantity.
Regeneration Initiation. When the regeneration

quantity number first reaches 0, relay 1 energizes for
the length of time which has been set. The regeneration
quantity immediately resets and begins counting down
again. If alternating mode has been selected, the next
time it reaches 0, relay 2 will energize, and the cycle
after that, will return to relay 1.

An output can be manually forced at any time by
pressing the Start/Stop key. The relay will energize for
the set time, and regeneration volume will return to its
original setting to begin counting down again.

Repair

The only field-repairable component on the FT520 is
the fuse. If failure is due to a cause other than a blown
fuse, it is necessary to replace the entire board stack.
Contact your distributor for information.

Alternating Tanks Application

Flow Sensor

Tank 1

FT520-84

Tank 2

Caution: Always disconnect
power to the unit before open­ing the terminal cover. Do not

!

reconnect power until all con­nections have been made and

the terminal cover has been replaced.

Connection for Alternating Tanks

Tank 1

Tank 2

Relay 1

Relay 2

NO
COM

NC

NO
COM

NC

Panel cut-out dimensions

gasket

5.50"

1/4" holes (4 required)

5.50"

PANEL
CUTOUT

6.03"

6.03"

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19026 72nd Ave South., Kent, WA 98032 USA

Phone: [phone] Fax: [phone]

www.seametrics.com 1-800-975-8153