PD138 Minimux® II
Temperature & Process Scanner
• 8 Inputs Per Unit, Eliminates Need for 7 Displays
• Unlimited Number of Units Per System
• Free Custom Message Labels
• Thermocouples, RTDs, Process, AC & DC Inputs
• Internally or Manually Controlled Scanning
• Adjustable Dwell Time for Each Channe l
• Independent Alarm Input for Eac h Channel
• First-Out Alarm Indication
• Alarms Indicated by LEDs, Built-in Horn, an d Re lay
• Built-In 85 dB Horn with Silence Pushbutton
• Stop-On-Alarmed Channel (field select)
• Non-Interruptible 4-20 mA Inputs
• Sunlight Readable Indication
• NEMA 4X / IP65 Front
• Shallow Depth 1/8 DIN Enclosure
• -40 to 65°C Operating Temperature Range
PRECISION DIGITAL CORPORATION
89 October Hill Road • Holliston MA 01746 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
PD138 Minimux® II Temp & Process Scanner Instruction Manual
Disclaimer
The information contained in thi s document is subject to change
without notice. Precision Digital makes no repre sen ta tions or
warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for a
particular purpose.
!
CAUTION: Read complete
instructions prior to
installation and operation
of the meter.
Warning
This product is not recommended for life support applications or
applications where malfunctioning could result in personal injury or
property loss. Anyone using this product for such applications does
so at his/her own risk. Precisio n Digit al Corpo ratio n shal l not be held
liable for damages resulting from such im pro per use.
Limited Warranty
Precision Digital Corporation warrant s this product against defects in
material or workmanship for the specified period under
“Specifications” from the date of shipment from the factory.
Precision Digital’s liability under this limited warranty shall not
exceed the purchase value, repair, or replacement of the defective
unit.
WARNING: Risk of
electric shock or
personal injury.
Registered Trademarks
All trademarks mentioned in this document are the property of their
respective owners.
© 2009 Precision Digital Corporation. All rights reserved.
www.predig.com
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
Table of Contents
INTRODUCTION ........................................................................... 5
ORDERING INFORMATION ........................................................ 6
SPECIFICATIONS ........................................................................ 7
SETUP AND PROGRAMMING OVERVIEW ................................ 8
SAFETY INFORMATION .............................................................. 9
INSTALLATION ............................................................................ 9
Unpacking ........................................................................................... 9
Panel Mounting ................................................................................. 10
CONNECTIONS OVERVIEW ..................................................... 11
SIGNAL CONNECTIONS ........................................................... 11
Three-Wire RTD Inputs ..................................................................... 12
Thermocouple Inputs ........................................................................ 12
4-20 mA Inputs ................................................................................. 13
Voltage Inputs ................................................................................... 14
MULTIPLE PD138 CONNECTIONS .......................................... 15
ALARM-IN CONNECTIONS ....................................................... 17
ALARM RELAY CONNECTIONS .............................................. 18
Connections ...................................................................................... 18
EXTERNAL SIL, ACK, & STOP/GO CONNECTIONS ............... 19
PROGRAMMING OVERVIEW .................................................... 19
Front Panel Pushbuttons and Status LED Indicators ........................ 20
Programming Dwell Time ................................................................. 21
Programming Dwell Time for Multiple PD138 System ...................... 22
Returning to Four-Second Default Dwell Time ................................. 22
PROGRAMMING ALARM SEQUENCES .................................. 22
Stop or Continuous Scanning On Alarm ........................................... 22
Selecting Alarm Sequence ............................................................... 23
Relay Fail-Safe ................................................................................. 23
OPERATION ............................................................................... 24
Scan, Stop Scan & Quick-Scroll ....................................................... 24
Stop Scan ......................................................................................... 24
Quick-Scroll ...................................................................................... 24
Multiple Units .................................................................................... 25
Built-In Horn ................................................................................. 25
Alarm Relay ................................................................................. 25
SILENCE, STOP/GO & ACK Buttons .......................................... 25
External SILENCE, STOP/GO & ACK Terminals ......................... 25
Alarms .............................................................................................. 26
First-Out Alarms (F2A) ...................................................................... 26
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
Alarm Indication ................................................................................ 27
ALARM SEQUENCE EXAMPLES ............................................. 28
Sequence A ...................................................................................... 28
If Momentary Alarm ...................................................................... 29
If Maintained Alarm ...................................................................... 29
Sequence F2A .................................................................................. 30
Acknowledge ............................................................................... 31
Stop-On-Alarm .................................................................................. 32
MESSAGE LABELS ................................................................... 33
MOUNTING DIMENSIONS ......................................................... 34
Table of Contents
Figure 1. Panel Cutout and Mounting ................................................ 10
Figure 2. Connector Labeling for PD138 ........................................... 11
Figure 3. Case Dimensions – Side View ............................................ 34
Figure 4. Case Dimensions – Top View ............................................. 34
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
INTRODUCTION
The Minimux® II is a microprocessor-based eight channel analog input
scanner/multiplexer and annunciator that provides low-cost automatic
switching for multi-point display and alarm systems. Each Minimux
can automatically switc h up to eight inputs to another device such as a
digital panel meter, controller, or PLC. Multiple units can be connected
together to scan an unlimited number of points. Front panel push-buttons
allow for easy programming of independent adjustable dwell times as
well as rapid channel skipping. The built-in annunciator logic can detect
and indicate which input signals are in alarm condition. The built-in horn,
alarm relay, and front panel LEDs are sure to catch the operators
attention. Signal switching is done with reed relays making the Minimux
II ideal for switching thermocouples, RTDs, control loops, and AC & DC
signals.
®
II
®
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
ORDERING INFORMATION
24 VDC
Model
PD138-2 PD138-3 PD138-4 8 Channel Temp & Process Scanner
PD138-2-CL PD138-3-CL PD138-4-CL
Notes:
1. Message label s for the PD 138 may be specified a t time of ord er or later. Se e page 33 for details.
2. There is no special cable required to connect multiple PD138s together.
Enclosures
Model
PDA2501-V 1 Plastic NEMA 4X Enclosure Through Door
PDA2502-V 2 Plastic NEMA 4X Enclosure Through Door
PDA2503-V 3 Plastic NEMA 4X Enclosure Through Door
PDA2504-V 4 Plastic NEMA 4X Enclosure Through Door
PDA2505-V 5 Plastic NEMA 4X Enclosure Through Door
PDA2506-V 6 Plastic NEMA 4X Enclosure Through Door
PDA2522 2 Plastic NEMA 4X Enclosure; 1(V) 1(H) Through Door
PDA2601-V 1 Stainless Steel NEMA 4X Enclosure Through Door
PDA2602-V 2 Stainless Steel NEMA 4X Enclosure
PDA2603-V 3 Stainless Steel NEMA 4X Enclosure
PDA2604-V 4 Stainless Steel NEMA 4X Enclosure
PDA2605-V 5 Stainless Steel NEMA 4X Enclosure
PDA2606-V 6 Stainless Steel NEMA 4X Enclosure
PDA2622 2 SS NEMA 4X Enclosure; 1(V) 1(H)
PDA2701-V 1 Steel NEMA 4 Enclosure
PDA2702-V 2 Steel NEMA 4 Enclosure
PDA2703-V 3 Steel NEMA 4 Enclosure
PDA2704-V 4 Steel NEMA 4 Enclosure
PDA2705-V 5 Steel NEMA 4 Enclosure
PDA2706-V 6 Steel NEMA 4 Enclosure
PDA2722 2 Steel NEMA 4 Enclosure; 1(V) 1(H)
PDA2801 1 Plastic NEMA 4X Enclosure
115 VAC
Model
# of
Units
230 VAC
Model
Description
8 Channel Temp & Process Scanner
with current loop resistor
Description Mounting
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Door
Through Cover
Systems
Model Description Kit Components
PDS178
Temperature Scanning
& Alarming System
PD765-6R2-00
PD138-3
PDA2821
6
Process & Temperature Meter
Minimux II
Plastic NEMA 4X Enclosure
PD138 Minimux® II Temp & Process Scanner Instruction Manual
SPECIFICATIONS
NUMBER OF
CHANNELS PER
MINIMUX
NUMBER OF
CHANNELS PER
SYSTEM
SIGNALS
SWITCHING
CONTACT
RESISTANCE
MAXIMUM INPUT
VOTAGE
MAXIMUM
CURRENT
SWITCHED
MAXIMUM
POWER
SWITCHED
DWELL
TIME
NON-VOLATILE
MEMORY
SCAN METHOD
CHANNEL
INDICATION
DISABLING
CHANNELS
SCAN STOP
ALARM INPUT
ALARM
SEQUENCE
ALARM OUTPUTS
8 double-pole channels per unit
Unlimited
DPST reed relays
0.2 Ω maximum
200 V (switched or common mode)
0.5 A
10 W
Each channel adjustable from 0.6 to 30 seconds
All programming values are stored in non-volatile
memory for ten years if power is lost
Internal or manually controlled
Green LED on front panel
Any channel may be disabled
The scan may be stopped by pressing and holding the
STOP/GO button for more than 0.5 seconds. The scan
may be resumed by pressing and releasing the STOP/GO
button quickly (less than 0.5 seconds)
Independent alarm input for each channel. Input
Impedance; 25 Kohm, typical pull-up to 5 V
Sequence A or Sequence F2A (First-Out)
Alarm condition indicated by:
1. Front panel red LED for each channel.
2. Relay, 1 SPDT (form C); rated 2 A @ 30 VDC or 2 A
@ 250 VAC resistive load; 1/14 HP @ 125 / 250
VAC for inductive loads. For fail-safe operation, the
relay is energized in the non-alarm state. In the case
of a power failure, the relay will go to the alarm
state, (NC contact is connected to common).
3. Built-in horn, 85 dB.
4. Stop-on-alarmed-channel (user select)
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
ALARM
ACKNOWLEDGE
EXTERNAL
SWITCH
FUNCTIONS
MESSAGE
LABELS
CONNECTIONS
ENVIRONMENTAL
POWER OPTIONS
based on model number
LED TEST
ENCLOSURE
FRONT PANEL
WARRANTY
Front panel ACK and rear connector terminals
The functions of the front panel buttons are available at
screw terminals at the rear of the instrument
Free, custom printed, 2 lines per message at 14
characters per line. Factory or field printable. See page
33 or www.predig.com for details.
Removable screw terminal connectors provided:
Power + Relay 22 to 12 AWG
Alarm Input, Analog Signal,
External Switches, I/O
Operating temperature -40°C to 65°C
Storage temperature -40°C to 85°C
Relative humidity 0 to 95% non-condensing
115 VAC, ± 10%, 50/60 Hz, 4 VA
230 VAC, ± 10%, 50/60 Hz, 4 VA
12-24 VDC (9-18 VAC, 50/60 Hz) 2 W
All LEDs are tested on power-up
1/8 DIN, high impact plastic, UL94V-0
NEMA 4X, panel gasket provided
3 years parts and labor
30 to 16 AWG
SETUP AND PROGRAMMING OVERVIEW
Programming and installing the PD 13 8 in volves three basic steps:
1) Connections
a) AC power
b) Signal inputs and output
c) Multiple PD138s (if needed)
d) Alarm-Inputs (if needed)
e) Alarm relay (if needed)
f) External switch inputs (if needed)
2) DIP Switch Setup
a) Sequence A or Sequence F2A alar m operation
b) Stopping-on-alarm or to continue scan ni ng on alarm
c) Relay fail-safe
3) Programming the PD138 for various functions:
a) Channels to scan
b) Dwell times of scanned channels
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
SAFETY INFORMATION
!
CAUTION: Read complete
instructions prior to
installation and operation
of the instrument.
WARNING
Hazardous voltages exist within enclosure. Installation and service
should be performed only by trained service per s on nel .
INSTALLATION
There is no need to remove the instrument from its case to
complete the installation, wiring, and setup.
Unpacking
Remove the instrument from box. Inspect the packaging and
contents for damage. Report damages, if any, to the carrier.
If any part is missing or the unit malfunctions, please contact
your supplier or the factory for assistance.
WARNING: Risk of
electric shock.
9
PD138 Minimux® II Temp & Process Scanner Instruction Manual
Panel Mounting
• Prepare a standard 1/8 DIN vertical pa n el cutout – 1.772" x 3.622"
(45 mm x 92 mm). Refer to Figure 1 for more details.
• Clearance: allow at least 4" (102 mm) behind the panel for w iring .
• Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Recommended minimum panel thickness to maintain Type 4X
rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm) plastic panel.
• Remove the two mounting brackets provided with the meter (back-off
the two screws so that there is ¼" (6.4 mm) or less through the
bracket. Slide the bracket toward the front of the case and remove).
• Insert the unit into the panel cutout.
• Install mounting brackets and tighten the screw s against the panel.
To achieve a proper seal, tighte n the mounting bracket screws
evenly until the front is snug to the panel along its short side. DO
NOT OVER TIGHTEN, as the rear of the panel may be damaged.
Figure 1. Panel Cutout and Mounting
Note: The PD138 can
be horizontally mounted.
Free custom message
labels can be ordered to
align with horizontal
mounting, see page 33
or www.predig.com for
details.
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PD138 Minimux® II Temp & Process Scanner Instruction Manual
CONNECTIONS OVERVIEW
All connections are made to removable screw terminal connections
which are supplied with each PD138.
Figure 2. Connector Labelin g for PD138
SIGNAL CONNECTIONS
Signal input and output connections for the Minimux
position removable screw terminal connector supplied with each unit.
The following table gives the input and output terminal assignments:
SCREW TERMINAL
CHANNEL + LINE - LINE RTD COMMON
3-wire RTD tie point TP
Input 1 1A 1B
Input 2 2A 2B
Input 3 3A 3B
Input 4 4A 4B
Input 5 5A 5B
Input 6 6A 6B
Input 7 7A 7B
Input 8 8A 8B
Output Output A Output B
®
II are made to a 23
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