APG RCU-7000 User Manual

AUT OMATION

Operator’s Manual

PRODUCTS

GROUP, INC.

RCU-7000 Series

Power Relay Unit for Pump Control

Rev . A1, 4/07

Automation Products Group, Inc.

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RCU-7000 Series Rev . A1, 4/07

Table of Contents

Warranty .............................................................................................................3

Introduction ......................................................................................................4

Speci cations ....................................................................................................5

Dimensions ........................................................................................................6

Description of Controls .................................................................................6

Operating Characteristics of Relay Units ................................................7

Principle of Operation ...................................................................................8

Installation .........................................................................................................9

Electrical Connection and Adjustment ................................................11

Maintenance and Inspection ...................................................................15

Troubleshooting ........................................................................................... 16

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Rev . A1, 4/07 RCU-7000 Series

• Warranty and Warranty Restrictions

APG warrants its products to be free from defects of material and workmanship
and will, without charge, replace or repair any equipment found defective
upon inspection at its factory, provided the equipment has been returned,
transportation prepaid, within 24 months from date of shipment from factory.

THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES
ALL OTHER WARRANTIES NOT EXPRESSLY SET FORTH HEREIN,
WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR
OTHERWISE INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.

No representation or warranty, express or implied, made by any sales
representative, distributor, or other agent or representative of APG which is
not specifi cally set forth herein shall be binding upon APG. APG shall not be
liable for any incidental or consequential damages, losses or expenses directly
or indirectly arising from the sale, handling, improper application or use of the
goods or from any other cause relating thereto and APG’s liability hereunder, in
any case, is expressly limited to the repair or replacement (at APG’s option) of
goods.

Warranty is specifi cally at the factory. Any on site service will be provided at
the sole expense of the Purchaser at standard fi eld service rates.

All associated equipment must be protected by properly rated electronic/
electrical protection devices. APG shall not be liable for any damage due
to improper engineering or installation by the purchaser or third parties.
Proper installation, operation and maintenance of the product becomes the
responsibility of the user upon receipt of the product.

Returns and allowances must be authorized by APG in advance. APG will
assign a Return Material Authorization (RMA) number which must appear
on all related papers and the outside of the shipping carton. All returns are
subject to the fi nal review by APG. Returns are subject to restocking charges as
determined by APG’s “Credit Return Policy”.

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RCU-7000 Series Rev . A1, 4/07

• Introduction

This relay unit, model RCU-7000 series, may be used with any APG level
sensor, such as models ELS, FL, FT, SLS and LF. If the level sensing  oat switch
has dry contacts, the RCU-7000 will increase the contact rating capacity. The
RCU-7000 is used for control functions such as latching for pump operation or
alarm setpoints.

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Rev . A1, 4/07 RCU-7000 Series

• Specifi cations

Operation Versions

RCU-7000: Standard

RCU-7100: High Sensitivity

Characteristics

Power Supply: 90 -132 VAC/180 - 264 VAC, 50/60 Hz

Power Consumption: 1.5 VA max.

Output Signal: SPDT relay contact

Contact Rating: 240 VAC, 5 A; 30 VDC, 5 A

Power Source to Sensor: 8 VAC, 5 mA max.

Cable Length between

Sensors and Relay Units: RCU-7000 - 3,000 ft. (max.);

RCU-7100 - 300 ft. (max.)

Operation Resistance: See Table 1 and 2

Reset Resistance: See Table 1 and 2

Alarm Indicator: Red LED

Power Indicator: Green LED

Environmental

Temperature: 32 to 120°F (0 to 50°C)

Storage Temperature: -4 to 160°F (-20 to 70°C)

Humidity 85% RH max.

Physical Attributes

Housing: ABS

Dimensions: 2 in. x 3 1/8 in. x 4 in.

Mounting Method: 11 pin socket

Weight: 0.62 lb. (280 g)

Speci cations are subject to change without notice for improvement.

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RCU-7000 Series Rev . A1, 4/07

• Dimensions - in./mm

• Description of Controls

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Rev . A1, 4/07 RCU-7000 Series

• Operating Characteristics of Relay Units

Table 1 Relay Actuation

RCU-7000 (Standard) Select Switch Mode
H. ON side L. ON side
Operating resistance (between E0 and E2)
4 Ký or less energize de-energize
Reset resistance (between E0 and E2)
15 Ký or more de-energize energize

RCU-7100 (High Sensitivity) Select Switch Mode
H. ON side L. ON side
Operating resistance (between EO and E2)
50 Ký or less energize de-energize
Reset resistances (between E0 and E2)
100 Ký or more de-energize energize

Table 2 Relay Actuation of Latch

RCU-7000 (Standard)
Operating/Reset Resistance Select Switch Mode
Between E0 and E1 Between E0 and E2 H. ON side L. ON side
1 15 Ký or more 15 Ký or more de-energize energize
2 4 Ký or less 15 Ký or more de-energize energize
3 4 Ký or less 4 Ký or less energize de-energize
4 4 Ký or less 15 Ký or more energize de-energize
5 15 Ký or more 15 Ký or more de-energize energize

RCU-7000 (High Sensitivity)
Operating/Reset Resistance Select Switch Mode
Between E0 and E1 Between E0 and E2 H. ON side L. ON side
1 100 Ký or more 100 Ký or more de-energize energize
2 50 Ký or less 100 Ký or more de-energize energize
3 50 Ký or less 50 Ký or less energize de-energize
4 50 Ký or less 100 Ký or more energize de-energize
5 100 Ký or more 100 Ký or more de-energize energize

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RCU-7000 Series Rev . A1, 4/07

Figure 3: Relay Action

• Principle of Operation

Figure 4: Wiring Schematic

The RCU-7000 is designed to replace the dry contact rating of the level
sensing  oat switch. The RCU-7000 can also input two point levels for pump
control either for  lling or emptying.

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Rev . A1, 4/07 RCU-7000 Series

• Installation

After unpacking, open shipping cartons of unit and inspect the units
for shipping damage. If there is evidence of damage, notify the carrier
immediately. Also verify the contents for properly ordered units.

Unpacking

This relay unit has been thoroughly inspected and carefully packed at the
factory to prevent from damage during shipment. When unpacking, care
must be taken not to damage the instrument with mechanical shock. After
unpacking, visually check the instrument exterior for damage.

Note the following points:

• Remove the relay unit from the package carefully. Also, take out the
socket from the package if ordered.

• Model number of the relay is indicated on the nameplate. Check it to be
sure if it is as required.

• Check exterior for damage. If there is, contact APG.

Installation Location

This relay unit should be installed in an area with the following conditions:

1. Provide ample space for maintenance/inspection.

2. Low relative humidity and no exposure to moisture.

3. No corrosive gases. (Such as HN

, SO2, C12, etc)

S

4. No excessive vibration.

Installation of Relay Unit

This relay unit installation method depends on the mounting type, either 11

pin socket or DIN rail.

The socket (Omron 11PFA) for relay unit is optional.

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RCU-7000 Series Rev . A1, 4/07

Surface Mounting with Socket

Drill 2-4.5 dia. mounting holes with 15 mm deep or tap A-M4 threads. See

drawing.

Surface Mounting Method

Rail Mounting with DIN Rail (35 mm)

DIN Rail Mounting Method

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Rev . A1, 4/07 RCU-7000 Series

• Electrical Connection and Adjustment

Wiring Diagram for High or Low Level Alarm

High level alarm (Select SW: H.ON side)
(a) When the l
(b) When the l

switch actuate, relay energize.

1

switch de-actuate, relay de-energize.

1

Low level alarm (Select SW: L. ON side)
(a) When the l
(b) When the l

switch actuate, relay de-energize.

1

switch de-actuate, relay energize.

1

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RCU-7000 Series Rev . A1, 4/07

Wiring Diagram for Dual Level Empty/Fill

Out ow control (Select Sw: H. ON side)
(a) When the l
(b) When the l
(c) When the l
(d) When the l

switch actuate as level falls, relay energize.

1

switch de-actuate as level rises, relay energize.

1

switch de-actuate as level rises, relay de-energize.

2

switch actuate as level falls, relay de-energize.

2

In ow control (Select Sw: L. ON side)
(a) When the l
(b) When the l
(c) When the l
(d) When the l

switch actuate as level falls, relay energize.

2

switch de-actuate as level rises, relay energize.

2

switch de-actuate as level rises, relay de-energize.

1

switch actuate as level falls, relay de-energize.

1

12

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Rev . A1, 4/07 RCU-7000 Series

Pump Control Wiring Diagram
with Low and High Level Alarms (FL Sensor)

Pump Control Wiring Diagram
with Low and High Alarms (ELS Sensor)

Caution: To avoid malfunction, the E1 contact must be connected to lower

switch. Actuation direction of switch must be set same direction.

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RCU-7000 Series Rev . A1, 4/07

(a) When the l4 switch actuate as level rises, relay (no. 3) energize.
(b) When the l

switch de-actuate as level falls, relay (no. 1) energize.

1

(c) Relay (no. 2) may be used for control functions such as latching for pump

control.

Caution: Actuation direction of all switches must be “upper ON” (NO)
WARNING: Earth terminal “4” shall be grounded. If it is not grounded, you

will get an electric shock.

Wiring Diagram for Dual Pumps Emptying
with High Alarm (ELS Sensor)

Note the following points:

• Do not connect the multiple relay units to same level switch. Relay units
will malfunction.

• Power supply must be connected in phase

(• To avoid malfunction, the wiring distance should be used within

speci cations. (Refer to Speci cations). If the wiring distance exceed
speci cations, the relay unit may be malfunction by tray capacitance
between cables or noise.

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Rev . A1, 4/07 RCU-7000 Series

• Maintenance and Inspection

The following annual servicing tasks should be carried out on the sensor

and relay unit.

(1) Remove the sensor from tank carefully.
(2) Ensure there is no damage.
(3) If sediment or other foreign matters are stained on sensor, clean the

sensor.

(4) Make contact between E0 and E2, and check the relay unit operation.
(5) Spare parts should be ordered from APG, whose address appears on

the title page.

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RCU-7000 Series Rev . A1, 4/07

• Troubleshooting

Problem

Relay unit de-energize with level change

Possible Causes

• Miswiring between sensor and relay unit

• Set for improper select switch (Select SW) mode of relay unit

Remedies

• Ensure the wiring is correct.

• Change the select switch mode (H ON/L ON).

Problem

Relay unit energize with level changes

Possible Causes

• Miswiring between sensor and relay unit

• Set for improper select switch (Select SW) mode of relay unit

• A ection by stray capacitance

Remedies

• Ensure the wiring is correct.

• Change the select switch mode (H ON/L ON).

• Rewire as short as possible

Problem

Relay Chatter

Possible Causes

• Miswiring between sensor and relay unit

Remedies

• Ensure the wiring is correct.

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Rev . A1, 4/07 RCU-7000 Series

Notes

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RCU-7000 Series Rev . A1, 4/07

Notes

18

Automation Products Group, Inc.

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Rev . A1, 4/07 RCU-7000 Series

Notes

Automation Products Group, Inc.

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19

AUT OMATION

PRODUCTS

GROUP, INC.

APG...Providing tailored solutions
for measurement applications

Automation Products Group, Inc.

Tel: [phone]
1/435/753-7300
Fax: [phone]

e-mail: [e-mail]

www.apgsensors.com

Automation Products Group, Inc.

1025 W. 1700 N.

Logan, UT 84321