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Temperature & Process Scanner
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PRECISION DIGITAL CORPORATION
Find Quality Products Online at:
PD138 Minimux
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 Channel
Independent Alarm Input for Each Channel
First-Out Alarm Indication
Alarms Indicated by LEDs, Built-in Horn, and Relay
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
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Related Manuals for Precision Digital Corporation PD138 Minimux II
Summary of Contents for Precision Digital Corporation PD138 Minimux II
- Page 1 • 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 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 2 Anyone using this product for such applications does so at his/her own risk. Precision Digital Corporation shall not be held liable for damages resulting from such improper use. Limited Warranty...
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Page 3: Table Of Contents
® 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 ............. - Page 4 ® PD138 Minimux II Temp & Process Scanner Instruction Manual 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 ............
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Page 5: Introduction
® 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 II can automatically switch up to eight inputs to another device such as a digital panel meter, controller, or PLC. -
Page 6: Ordering Information
® PD138 Minimux II Temp & Process Scanner Instruction Manual ORDERING INFORMATION 24 VDC 115 VAC 230 VAC Description Model Model Model PD138-2 PD138-3 PD138-4 8 Channel Temp & Process Scanner 8 Channel Temp & Process Scanner PD138-2-CL PD138-3-CL PD138-4-CL with current loop resistor Notes: 1. -
Page 7: Specifications
® PD138 Minimux II Temp & Process Scanner Instruction Manual SPECIFICATIONS Number of Channels per 8 double-pole channels per unit Minimux Number of Channels per Unlimited System Signals Switching DPST reed relays Contact Resistance maximum Maximum Input Voltage 200 V (switched or common mode) Maximum Current 0.5 A Switched... -
Page 8: Setup And Programming Overview
® PD138 Minimux II Temp & Process Scanner Instruction Manual Message Labels 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. Connections Removable screw terminal connectors provided: Power + Relay 22 to 12 AWG... -
Page 9: Safety Information
® PD138 Minimux II Temp & Process Scanner Instruction Manual SAFETY INFORMATION CAUTION: Read complete WARNING: Risk of instructions prior to electric shock. installation and operation of the instrument. WARNING Hazardous voltages exist within enclosure. Installation and service should be performed only by trained service personnel. INSTALLATION There is no need to remove the instrument from its case to complete the installation, wiring, and setup. -
Page 10: Panel Mounting
® PD138 Minimux II Temp & Process Scanner Instruction Manual Panel Mounting • Prepare a standard 1/8 DIN vertical panel 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 wiring. •... -
Page 11: Connections Overview
® 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 Labeling for PD138 SIGNAL CONNECTIONS ® Signal input and output connections for the Minimux II are made to a 23 position removable screw terminal connector supplied with each unit. -
Page 12: Three-Wire Rtd Inputs
® PD138 Minimux II Temp & Process Scanner Instruction Manual Three-Wire RTD Inputs Note: Three-wire inputs such as thermistors and RTDs can be handled by switching the two common wires and connecting the third wire of each sensor to the TP terminal and to the temperature meter. •... -
Page 13: 4-20 Ma Inputs
® PD138 Minimux II Temp & Process Scanner Instruction Manual 4-20 mA Inputs ® A special version of the Minimux II is used to switch 4-20 mA signals. PD138-X-CL versions have a built-in resistor network that eliminates loop interruptions. The process meter must be setup for 1-5 V input and the complete system should be calibrated together. -
Page 14: Voltage Inputs
® PD138 Minimux II Temp & Process Scanner Instruction Manual Voltage Inputs GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com... -
Page 15: Multiple Pd138 Connections
® PD138 Minimux II Temp & Process Scanner Instruction Manual MULTIPLE PD138 CONNECTIONS ® Multiple Minimux II can be connected together to increase multiplexing capacity for an unlimited number of points. When connecting several units together, one unit of the group is designated the master unit and all other units function as follower units. - Page 16 ® PD138 Minimux II Temp & Process Scanner Instruction Manual 3. Silence, Acknowledge, & Stop/Go Connections Connecting the ACK & STOP/GO terminals of all units in a multiple-unit system allows the operator to control and acknowledge alarms from any ® unit in the system or via external switches.
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Page 17: Alarm-In Connections
® PD138 Minimux II Temp & Process Scanner Instruction Manual ALARM-IN CONNECTIONS Each channel on the PD138 has its own Alarm-In line that provides independent alarm indication capability for each channel. The alarm input lines of the PD138 are normally high (pull-up to 5V). Relay contacts from a Precision Digital meter or a low level logic output from a PLC can be used to drive the PD138 alarm input lines. -
Page 18: Alarm Relay Connections
® PD138 Minimux II Temp & Process Scanner Instruction Manual ALARM RELAY CONNECTIONS One SPDT relay is provided with each unit. This alarm relay is common to all channels and is activated when the PD138 detects an alarm. The relay resets when the alarm is acknowledged. Connections Refer to the diagram below to wire up the alarm relay. -
Page 19: External Sil, Ack, & Stop/Go Connections
® PD138 Minimux II Temp & Process Scanner Instruction Manual EXTERNAL SIL, ACK, & STOP/GO CONNECTIONS Terminals at the rear of the instrument allow the functions of the SILENCE, ACK, and STOP/GO buttons to be performed externally. For instance, if the PD138 is mounted inside a NEMA 4X enclosure, switches mounted outside the enclosure could be wired to these terminals to provide the user with access to the SILENCE, ACK, and STOP/GO functions. -
Page 20: Front Panel Pushbuttons And Status Led Indicators
® PD138 Minimux II Temp & Process Scanner Instruction Manual Front Panel Pushbuttons and Status LED Indicators Button Description Silence Horn Acknowledge Alarm Stop/Go Description Channel Alarm Status Indicators Green Current Channel Current Channel in Yellow Alarm Condition Power Indicates power is on. GlobalTestSupply www. -
Page 21: Programming Dwell Time
® PD138 Minimux II Temp & Process Scanner Instruction Manual Programming Dwell Time The default dwell time for the PD138 is four seconds per channel and it can be adjusted for any time between 0.6 and 30 seconds per channel. A channel can be disabled from the scan sequence by programming that channel’s dwell time for less than 0.5 seconds during setup. -
Page 22: Programming Dwell Time For Multiple Pd138 System
® PD138 Minimux II Temp & Process Scanner Instruction Manual Programming Dwell Time for Multiple PD138 System The dwell times for each PD138 in a multiple PD138 system need to be programmed individually. Returning to Four-Second Default Dwell Time To return to the default dwell time of four seconds per channel: Turn the power off Apply power while holding the STOP/GO button. -
Page 23: Stop Or Continuous Scanning On Alarm
® PD138 Minimux II Temp & Process Scanner Instruction Manual Stop or Continuous Scanning On Alarm The PD138 can be programmed to either stop or continue scanning when it encounters a channel in alarm. See page 22 for further details on this function Switch 1 Function... -
Page 24: Operation
® PD138 Minimux II Temp & Process Scanner Instruction Manual OPERATION In its most basic form, the PD138 is the electrical equivalent to a double- pole, eight position automatic switch. That is, whatever input is brought into the PD138 is dwelled on for a certain amount of time while being switched back out to another device. -
Page 25: Multiple Units
® PD138 Minimux II Temp & Process Scanner Instruction Manual Multiple Units A system made up of multiple PD138s does not require any special setup or programming. In fact, the model number is the same for all units and they operate in the same manner as single units. There are several terminals on each PD138 in the system that have to be connected together, but this does not require a special cable. -
Page 26: Alarms
® PD138 Minimux II Temp & Process Scanner Instruction Manual Alarms ® Each channel of the Minimux II has an independent ‘Alarm-In’ terminal ® that allows an external device to trigger an alarm on the Minimux II. The external device may be the relay contacts on a digital panel meter, such as the PD765-6R2-00, or the digital output from a PLC. -
Page 27: Alarm Indication
® PD138 Minimux II Temp & Process Scanner Instruction Manual Alarm Indication The PD138 indicates alarms in 3 ways: A normally green LED turns to red and flashes An internal horn sounds An alarm relay transfers. The way red LEDs behave during an alarm depends on whether the PD138 was programmed to respond to alarms via Sequence A or Sequence F2A. -
Page 28: Alarm Sequence Examples
® PD138 Minimux II Temp & Process Scanner Instruction Manual ALARM SEQUENCE EXAMPLES Sequence A ® The PD138 is After the Minimux The unit continues to scanning all the has dwelled on scan other points selected inputs and channel 3 for the and an operator is currently at appropriate settling... -
Page 29: If Momentary Alarm
® PD138 Minimux II Temp & Process Scanner Instruction Manual If Momentary Alarm If Maintained Alarm ® ® When the Minimux II returns to When the Minimux II returns to channel 3, the LED will appear channel 3, the LED will appear yellow (a combination of green yellow (a combination of green ®... -
Page 30: Sequence F2A
® PD138 Minimux II Temp & Process Scanner Instruction Manual Sequence F2A The main feature of Sequence F2A is its ability to indicate which alarms occurred first (on a scan cycle, see page 26). ® The PD138 is scanning all the After the Minimux II has dwelled selected inputs and is currently at... -
Page 31: Acknowledge
® PD138 Minimux II Temp & Process Scanner Instruction Manual Acknowledge ® The unit continues to scan and The Minimux II continues to an operator acknowledges the scan and again returns to alarm. All LEDs go to steady, the channel 3, the LED will appear ®... -
Page 32: Stop-On-Alarm
® PD138 Minimux II Temp & Process Scanner Instruction Manual Stop-On-Alarm The PD138 can be programmed to stop scanning when an alarm condition is detected by setting DIP switch 1 to the ON position, as described on page 22. If the DIP switch is in the ON position, the PD138 will stop when it encounters an alarm and the LED will begin to flash yellow (combination of red and green), the horn will sound and the alarm relay will transfer. -
Page 33: Message Labels
® PD138 Minimux II Temp & Process Scanner Instruction Manual MESSAGE LABELS Message labels for the PD138 may be factory-printed at no charge, or field-printed using a laser printer & clear self-adhesive labels. Factory- Printed labels may be ordered at any time by completing the form below. Horizontal mounting labels available, see page 10 for sample. -
Page 34: Mounting Dimensions
® PD138 Minimux II Temp & Process Scanner Instruction Manual MOUNTING DIMENSIONS Figure 3. Case Dimensions – Side View Figure 4. Case Dimensions – Top View GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com... - Page 35 ® PD138 Minimux II Temp & Process Scanner Instruction Manual NOTES GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 36 ® PD138 Minimux II Temp & Process Scanner Instruction Manual LIM138_C SFT053 Ver 1.0 & up 10/15 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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