OHAUS CKW Series User manual
Juego opcional de Relevador CKW para el
modelo de Indicador CKW-55 y para
las básculas de la serie CKW
Instrucciones de instalación y operación
Juego de relevador de corriente alterna, N/P 71167967
Juego de relevador de corriente directa, N/P 71173377
Kit opzionale relè CKW per l'indicatore
modello CKW-55 e per le bilance della
serie CKW
Istruzioni per l'installazione e
il funzionamento
Kit relè in CA, N/P 71167967
Kit relè in CC, N/P 71173377
CKW Relay Option Kit for Model
CKW-55 Indicator and CKW Series Scales
Installation and Operation Instructions
AC Relay Kit, P/N 71167967
DC Relay Kit, P/N 71173377
CKW-Relais-Optionssatz für Indikator Modell
CKW-55 und Waagen der CKW-Serie
Installations- und Bedienungsanweisungen
Wechselstrom-Relaissatz, Teilenr. 71167967
Gleichstrom-Relaissatz, Teilenr. 71173377
Kit d’option de relais CKW pour l’indicateur
CKW-55 et les balances de la série CKW
Instructions d’installation et d’exploitation
Kit du relais CA, réf. 71167967
Kit du relais CC, réf. 71173377
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CKW Relay Option Kit EN-1
INTRODUCTION
Two optional Relay Kits are available for CKW Series Indicators and Scales. The
AC Relay Kit is used for controlling up to three external AC circuits. The DC Relay
Kit is used for controlling up to three external DC circuits. Each solid-state relay
output is equivalent to a single pole, single throw switch (SPST). Each relay
circuit is protected by a replaceable fuse.
When installed, system software allows the relays to be programmed in a variety
of ways. Optional set ups include: Normally open or normally closed simulation,
on-off or on-hold sequencing, simultaneous, break-before-make (BBM) or make-
before-break (MBB) contact switching.
Each kit contains a PC board, 2 cables, 6 mounting screws, metal cover, cable tie
and this instruction manual.
BASIC APPLICATIONS
With the Relay Option board installed, external devices can be coordinated to
work with the system’s bar graph display.
• Relay Out 0 corresponds to the Yellow Under Bar graph section.
• Relay Out 1 corresponds to the Green Accept Bar graph section.
• Relay Out 2 corresponds to the Red Over Bar graph section.
Applications include: driving external Over/Accept/Under displays, motor controls
for semi-automatic filling systems, sorting systems, interfacing to industrial PLC
systems, etc. The Relay outputs can also be used as slave relays to drive higher
power relays in larger systems.
CAUTION: Read all safety warnings before installing, making
connections, or servicing the Relay option PCB. Failure to comply
with these warnings could result in personal injury and/or property
damage. Retain all instructions for future reference.
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EN-2 CKW Relay Option Kit
RELAY OUTPUT SPECIFICATIONS
Relay Output Voltage Rating Current Rating Fuse rating Off State Leakage
AC 24-240 VAC 2A* 2.5A / 250V 5 mA max
DC 5 – 60 VDC 2A* 2.5A / 250V 1 mA max
Relay Output Voltage Drop Isolation Load type
AC 1.6 VAC 4000V Optical Resistive or Inductive*
DC 1.5 VDC 4000V Optical Resistive or Inductive*
* For a dynamic motor current rating, the nominal current should be limited to 1.5A.
AC relays are zero crossing turn-on, solid-state type.
INSTALLATION
CAUTION:The installation and wire connections to the Relay option
board should only be done by authorized and qualified personnel,
such as an Electrician.
WARNING: BEFORE MAKING CONNECTIONS TO THE RELAY TERMINALS,
POWER OFF THE SYSTEM AND REMOVE ALL EXTERNAL AC POWER
CONNECTIONS. IF THE SYSTEM CONTAINS AN OPTIONAL RECHARGEABLE
BATTERY SYSTEM, BE SURE THAT THE ON/ZERO
OFF
BUTTON ON THE
INDICATOR IS USED TO FULLY TURN OFF THE SYSTEM AFTER REMOVING THE
AC POWER PLUG
WARNING: WHEN MAKING ANY LINE VOLTAGE CONNECTIONS TO THE AC
RELAY OPTION, FOLLOW NATIONAL ELECTRICAL CODE (NEC) OR LOCAL
AUTHORITY WIRING STANDARDS AND SAFETY PRACTICES.
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CKW Relay Option Kit EN-3
WARNING: ELECTRICAL SHOCK HAZARD EXISTS WITHIN THE HOUSING. THE
HOUSING SHOULD ONLY BE OPENED BY AUTHORIZED AND QUALIFIED
PERSONNEL. REMOVE ALL POWER CONNECTIONS TO THE UNIT BEFORE
OPENING. IF THE UNIT CONTAINS AN OPTIONAL RELAY CONTROL BOARD,
ADDITIONAL AC OR DC POWER CONNECTIONS MAY EXIST WITHIN THE HOUSING.
• Mount the PC board to the rear plate as shown in Figure 1 using 4
of the small screws supplied.
Cable Installation
• Connect the long cable supplied with the kit to connector J10 on the main PC
board. Connect the other end of the cable to either connector at the top of the
Relay Board. (See Figure 1). Using the cable tie supplied, attach the cable
to the plastic mount at the bottom of the housing. (Other cables may already
be attached to this same mount.) If the optional RS422/485 board has been
previously installed, do not use the long cable, instead use the short cable
supplied in the kit to connect the Relay Board to the similar connector on the
RS485 board.
Relay Board Installation
Opening the Indicator Housing
• Unfasten the 4 side screws of the Indicator housing, pull the front housing
section forward.
Figure 1. Relay Output Board Connections.
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EN-4 CKW Relay Option Kit
Making External Connections to the Relays
IMPORTANT: When connecting any AC line supplied device to the Relay
Option PCB, insure that each external device utilizes a properly
grounded AC connection.
• For connections to nominal 120 VAC or 220-240 VAC systems, use only
insulated wire sets rated to the local electrical code requirements.
• The wire set used for connection to the relay option PCB should be part of a
multi-conductor cable with a smooth, round outer insulating jacket.
• Do not run more than one cable through the watertight fitting.
• Do not run other low voltage wires within the same cable set that connects
to the Relay connections.
• The overall cable diameter must be between 0.157 in. to 0.315 in.,
(4 mm to 8 mm).
• The terminal connections require wire sizes in the range of 26 to 16 AWG,
(0.14 mm2to 1.5 mm2). Wire ends are stripped to 0.25 in. (6 mm). Follow
Figure 2 to strip cable and wire ends to the correct lengths.
• The cable from the Relay terminals must be routed directly to the watertight
fitting at the left side of the Indicator housing. This is the closest fitting just
below the Relay PCB. See Figure 1.
Figure 2. Cable Preparation.
*NOTE: Install the Cable Tie after inserting the cable through the liquid-tight fitting.
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CKW Relay Option Kit EN-5
Figure 3. Relay Output
Board Contact Diagram.
• Each relay output has two terminals, connect each
wire pair to be switched to each set of terminals. See
Figure 3, for a relay contact diagram.
• For DC relay boards, make sure the polarity is correct.
• The DC Relay PCB can only be used with DC circuits.
• The AC Relay PCB can only be used with AC circuits.
• After making the proper connections, tighten the
external nut of the liquid-tight connector securely
around the cable.
• Install the Relay Terminal Cover as shown in
Figure 4 using the two screws supplied.
• The relay connections provide a switch closure only, AC or DC power must be
supplied externally.
• For reference, Appendix A shows typical examples of wiring to the relays.
Making External Connections to the Relays (Cont.)
Figure 4. Relay Output Board With Cover in Place.
CAUTION: Do not operate the Relay Option without the terminal cover
in place.
IMPORTANT: Review the I/O menu before using the relay option board
to control external devices.
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EN-6 CKW Relay Option Kit
Reassembly
• Before re-assembly, check that the liquid-tight connector is fully tighted.
• Check that no wires or cabling will be pinched when the two housing
sections are closed.
• Lift the front housing section back into place over the rear housing section.
• Replace the 4 side screws*.
*Note: It may be necessary to apply a moderate clamping pressure to the two
housing halves while replacing the side screws. This pressure compresses a
rubber gasket and insures the proper water tight seal for the housing.
When properly installed, the Relay Option board is automatically detected by the
system’s software. Installation is confirmed during the power on display
sequence with the message “ ”.
I/O (Section 3.6.6)
Reset: No, Yes
External Input: Off, Tare, Zero, Print,
Units, GNT, Accumula-
tion, Start-Stop,Tare-
Start-Stop
Input Beep: Off, On
Relay Output: Type, Sequence, Contact
End
Figure 5 illustrates the I/O Menu that is used
to configure the optional input and output
device parameters, (Relay Output control
and an External Input signal, such as a foot
switch input). This section is a copy of the
information appearing in the CKW Indicator
Instruction manual.
Figure 5. I/O Menu.
OPERATION
Menu Settings
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CKW Relay Option Kit EN-7
Reset
Allows resetting the current menu to factory defaults.
NOTE: Factory default settings are shown in bold.
Selections are: No, Yes.
External Input (INPUT)
Allows selection of a function to be controlled by an optional
external input device such as a foot switch. An external input
device would be connected to J7 of the Main PC board.
Only the two menu selections related to Relay operation are listed below:
= Start-Stop (S-S*) = The first input signal enables the output relay
operation, (Start). The second signal disables the relay operation,
(Stop).
= Tare-Start-Stop (T-S-S*) = The first input signal initiates a Tare
function. The second signal enables the output relay operation,(Start).
The third input signal disables the relay operation, (Stop).
*NOTE: The Start function will enable the relay operation even if the bar graph is
not currently showing the under condition near a weight value of zero.
s-s
t-s-s
Relay Output (OUTPUT)
Allows the configuration of relay output parameters.
Selections are: Type, Sequence, Contact.
Menu Settings (Cont.)
In general, menus are entered and menu items are selected by pressing the “Yes”
navigation button*. Menus are skipped and menu items are rejected by pressing
the “No” navigation button*.
* The navigation function of each button is shown with a diagonal line to the
function name.
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EN-8 CKW Relay Option Kit
Sequence (SEQ)
Allows alteration of the relay operating sequence as the weight
reading changes from under / accept / over.
Selections are: Normal, hold.
Normal = The previously enabled relay will be disabled as
the next relay is enabled.
Hold = The previously enabled relay will hold the same
state as the next higher relay is enabled.
Contact (CONTAC)
Allows alteration of relay contact closure.
Selections are: Sim, BBM, MBB.
Sim = Simultaneous. Relays open or close at the same time.
BBM = Break-Before-Make contact style.
MBB = Make-Before-Break contact style.
END (-END-)
Represents the end of the menu.
*NOTE: The normally closed condition is only active while the Indicator is
powered on. When powered off, the relays return to a normally open condition.
Type (TYPE)
Allows the selection of normally open or normally closed relay
functions. Selections are Open, Closed*.
OpenOpen
OpenOpen
Open = The initial state of the Relay output is normally open.
Closed = The initial state of the Relays output is normally closed.
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CKW Relay Option Kit EN-9
REPLACEMENT PARTS
Description Part Number
AC Relay Printed Circuit Board 71169512
DC Relay Printed Circuit Board 71152477
Fuse, Radial, 2.5A/250V, TR5 71173386
Long Option Cable 71170778
Short Option Cable 71170779
Service Information
For Service assistance in the United States and Canada, please call Ohaus
Corporation toll free at (800) 526-0659 from 8 AM to 5 PM Eastern Time. An
Ohaus Product Service Specialist will be available to help you.
FUSE REPLACEMENT
WARNING: ELECTRICAL SHOCK HAZARD EXISTS WITHIN THE HOUSING. THE
HOUSING SHOULD ONLY BE OPENED BY AUTHORIZED AND QUALIFIED
PERSONNEL. REMOVE ALL POWER CONNECTIONS TO THE UNIT BEFORE
OPENING. IF THE UNIT CONTAINS AN OPTIONAL RELAY CONTROL BOARD,
ADDITIONAL AC OR DC POWER CONNECTIONS MAY EXIST WITHIN THE
HOUSING.
To replace a burned fuse: After opening the housing, first remove the terminal
cover. Replace the burned fuse*. Reinstall the terminal cover. Reassemble the
housing.
*For continued protection, replace fuses only with the recommended type, (see
section: “REPLACEMENT PARTS”).
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