Partlow MIC 1401 Operating Manual

MIC 1401

1/4 DIN MICROBASED LIMIT CONTROLLER

OPERATORS
MANUAL

FORM 3669
EDITION 1
© OCT. 1995
PRICE $10.00

Brand

Information in this installation, wiring, and operation manual is subject to change
without notice. One manual is provided with each instrument at the time of ship­ment. Extra copies are available at the price published on the front cover.

Copyright © Oct. 1995, The Partlow Corporation, all rights reserved. No part of
this publication may be reproduced, transmitted, transcribed or stored in a retrieval
system, or translated into any language in any form by any means without the
written permission of the Partlow Corporation.

This is the First Edition of the MIC 1401 manual. It was written and produced
entirely on a desk-top-publishing system. Disk versions are available by written
request to the Partlow Publications Department.

We are glad you decided to open this manual. It is written so that you can take full
advantage of the features of your new MIC 1401 limit controller.

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Table of Contents

Section 1 - General Page

1.1 Product Description 5

Section 2 - Installation & Wiring

2.1 Installation & Wiring 7

2.2 Preparations for Wiring 9

2.3 Input Connections 15

2.4 Output Connections 17

Section 3 - Configuration & Operation

3.1 Operation 19

3.2 Configuration 24

Appendices

A - Glossary of Terms 30
B - Exploded View & Board Layout 34

Figure B-1 Exploded View 34
Figure B-2 Output 2/Output 3 Removal 35
Figure B-3 CPU PWA 36

Figure B-4 Option PWA DC Output 3 37
C - Hardware Definition Code 48
D - Input Range Codes 40
E - Specifications 42
F - Model Number Hardware Matrix 46
G - Software Reference Sheet 47

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Figures & Tables

Figure 1-1 Display Illustration 6
Figure 2-1 Panel Cut-Out Dimensions 8
Figure 2-2 Main Dimensions 8
Figure 2-3 Panel Mounting 9
Figure 2-4 Noise Suppression 12
Figure 2-5 Noise Suppression 12
Figure 2-6 Wiring 14
Figure 2-7 AC Power 15
Figure 2-8 Thermocouple Input 15
Figure 2-9 RTD Input 15
Figure 2-10 Volt, mV mADC Input 16
Figure 2-11 Remote Reset 16
Figure 2-12 Remote Digital Connections 17
Figure 2-13 Relay Output 1 17
Figure 2-14 Relay Output 2 17
Figure 2-15 Relay Output 3 18
Figure 2-16 mADC Output 3 18

Table 3-1 Enable Mode Configuration Procedures 25
Table 3-2 Program Mode Configuration Procedures 26
Table 3-3 Set-Up Mode Configuration Procedures 28

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Product Description 1.1

1.1.1 GENERAL

This instrument is a microprocessor based single loop limit controller, user
configurable to either High Limit type or Low Limit type.

The input is user configurable to directly connect to either thermocouple,
RTD, mVDC, VDC or mADC inputs. The instrument can operate from a
90-264 VAC, 50/60 HZ power supply, or optional 24 V AC/DC power supply.

Features include fail safe operation (relay de-energized by the limit ex­ceeded condition), front panel Reset switch, time limit exceeded display
and maximum/minimum tracking of excursions of the process variable.

1.1.2 DISPLAYS

Each instrument is provided with dual displays and status indicators as
shown in Figure 1-1. The upper display displays the value of the process
variable. The lower display displays the setpoint value. Status indication is
as shown in Figure 1-1, page 6.

1.1.3 ALARMS

Alarm indication is standard on all instruments. Up to two alarm outputs
are possible. Alarm type may be set as Process Direct or Reverse (high or
low), Logical Combination of the two alarms and Annunciator Direct or
Reverse. Alarm status is indicated by LED.

1.1.4 PROCESS VARIABLE/SETPOINT VALUE

RE-TRANSMISSION OUTPUT

If the instrument is specified with this option, this output may be scaled over
any desired range and re-transmitted.

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FIGURE 1-1

Keys and Indicators

AUTO

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Installation and Wiring 2.1

Electrical code requirements and safety standards should be observed and
installation performed by qualified personnel.

The electronic components of the instrument may be removed from the
housing during installation. To remove the components, grip the side
edges of the front panel and pull the instrument forward. During re-installa­tion, the vertically mounted circuit boards should be properly aligned in the
housing.

Ensure that the instrument is correctly orientated. A stop will operate if an
attempt is made to insert the instrument incorrectly.

can be over-ridden with enough force. If in doubt, check orientation
again!

Recommended panel opening sizes are illustrated in Figure 2-1, page 8.
After the opening is properly cut, insert the instrument into the panel open­ing. Ensure that the panel gasket is not distorted and that the instrument is
positioned squarely against the panel. Slide the mounting clamp into place
on the instrument (see Figure 2-3, page 9) and push it forward until it is
firmly in contact with the rear face of the mounting panel.

CAUTION: This stop

Note: The mounting clamp tongues may engage either on the
sides or the top/bottom of the instrument housing. Therefore, when
installing several instruments side-by-side in one cut out, use the
ratchets on the top/bottom faces.

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MIC 1401 Manual

FIGURE 2-1

Panel Cut-Out Dimensions

92 mm ± 0.8

(3.62”± .031)

FIGURE 2-2

Main Dimensions

PANEL
CUTOUT
SIZE

92 mm ± 0.8

(3.62”± .031)

100 mm (3.94 in.)

96 mm
(3.78 in)

Side View

96 mm
(3.78 in.)

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10 mm (0.39 in.)

FIGURE 2-3

Panel Mounting the Controller

Mounting Clamp

Controller Housing

Tongues on mounting clamp engage in
ratchet slots on controller housing

Preparation for Wiring 2.2

2.2.1 WIRING GUIDELINES

Electrical noise is a phenomenon typical of industrial environments. The
following are guidelines that must be followed to minimize the effect of
noise upon any instrumentation.

2.2.1.1 INSTALLATION CONSIDERATIONS

Listed below are some of the common sources of electrical noise in the
industrial environment:

• Ignition Transformers

• Arc Welders

• Mechanical contact relay(s)

• Solenoids

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Before using any instrument near the device listed, the instructions below
should be followed:

1. If the instrument is to be mounted in the same panel as any of the

listed devices, separate them by the largest distance possible. For

maximum electrical noise reduction, the noise generating devices

should be mounted in a separate enclosure.

2. If possible, eliminate mechanical contact relay(s) and replace with

solid state relays. If a mechanical relay being powered by an

instrument output device cannot be replaced, a solid state relay can

be used to isolate the instrument.

3. A separate isolation transformer to feed only instrumentation should

be considered. The transformer can isolate the instrument from noise

found on the AC power input.

4. If the instrument is being installed on existing equipment, the wiring in

the area should be checked to insure that good wiring practices have

been followed.

2.2.1.2 AC POWER WIRING

Neutral (For 115 VAC)
It is good practice to assure that the AC neutral is at or near ground poten­tial. To verify this, a voltmeter check between neutral and ground should be
done. On the AC range, the reading should not be more than 50 millivolts.
If it is greater than this amount, the secondary of this AC transformer sup­plying the instrument should be checked by an electrician. A proper neutral
will help ensure maximum performance from the instrument.

2.2.1.3 WIRE ISOLATION

Four voltage levels of input and output wiring may be used with the unit:

• Analog input or output (i.e. thermocouple, RTD, VDC, mVDC, or mADC)

• SPDT Relays

• AC power
The only wires that should run together are those of the same category. If

they need to be run parallel with any of the other lines, maintain a minimum
6 inch space between the wires. If wires must cross each other, do so at
90 degrees. This will minimize the contact with each other and reduces
“cross talk”.

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“Cross Talk” is due to the EMF (Electro Magnetic Flux) emitted by a wire as
current passes through it. This EMF can be picked up by other wires run­ning in the same bundle or conduit.

In applications where a High Voltage Transformer is used (i.e. ignition sys­tems) the secondary of the transformer should be isolated from all other
cables.

This instrument has been designed to operate in noisy environments, how­ever, in some cases even with proper wiring it may be necessary to sup­press the noise at its source.

2.2.1.4 USE OF SHIELDED CABLE

Shielded cable helps eliminate electrical noise being induced on the wires.
All analog signals should be run with shielded cable. Connection lead
length should be kept as short as possible, keeping the wires protected by
the shielding. The shield should be grounded at one end only. The pre­ferred grounding location is the sensor, transmitter or transducer.

2.2.1.5 NOISE SUPPRESSION AT THE SOURCE

Usually when good wiring practices are followed no further noise protection
is necessary. Sometimes in severe electrical environments, the amount of
noise is so great that it has to be suppressed at the source. Many manu­facturers of relays, contactors, etc. supply “surge suppressors” which
mount on the noise source.

For those devices that do not have surge suppressors supplied, RC (resis­tance-capacitance) networks and/or MOV (metal oxide varistors) may be
added.

Inductive Coils - MOV’s are recommended for transient suppression in
inductive coils connected in parallel and as close as possible to the coil.
See Figure 2-4, page 12. Additional protection may be provided by adding
an RC network across the MOV.

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FIGURE 2-4

0.5
mfd
1000V

220

Coil

ohms

115V 1/4W
230V 1W

Contacts - Arcing may occur across contacts when the contact opens and
closes. This results in electrical noise as well as damage to the contacts.
Connecting a RC network properly sized can eliminate this arc.

For circuits up to 3 amps, a combination of a 47 ohm resistor and 0.1
microfarad capacitor (1000 volts) is recommended. For circuits from 3 to 5
amps, connect 2 of these in parallel. See Figure 2-5.

FIGURE 2-5

MOV

R C

Inductive
Coil

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2.2.2 SENSOR PLACEMENT (Thermocouple or RTD)

Two wire RTD’s should be used only with lead lengths less than 10 feet.
If the temperature probe is to be subjected to corrosive or abrasive condi-

tions, it should be protected by the appropriate thermowell. The probe
should be positioned to reflect true process temperature:

In liquid media - the most agitated area
In air - the best circulated area

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FIGURE 2-6

Wiring Label

OUTPUT 3

Relay

+

INPUT

Linear (mA)

-

No external
connections
to be made
to these
terminals

-

­+

+

RTD

Linear (V/mV)

Thermocouple

N/C

SSR/DC

-

9
8
7
6
5
4
3

2
1

24

N/OC

+

11

1210

23 22

13
14
15
16

17
18
19

20
21

MAINS (LINE)
SUPPLY

24V 24V

L

AC DC

N

B

RS485

A

COM

-

+

SERIAL
COMMS.

N/C

C

SSR/DC

N/O

-

+

Relay

OUTPUT 1

+

SSR/DC

N/O

MIC 1401 Manual Edition 1

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Relay

OUTPUT 2

14

-

N/C

Input Connections 2.3

In general, all wiring connections are made to the instrument after it is in­stalled. Avoid electrical shock. AC power wiring must not be connected to
the source distribution panel until all wiring connection procedures are
completed.

FIGURE 2-7

Main Supply
Connect the AC line voltage, hot and neutral, to terminals 13 and 14 re­spectively as illustrated below. Connect the positive to terminal 14 and the
negative to terminal 13 for 24 VDC supply.

-

13

14

L

N

+

FIGURE 2-8

Thermocouple (T/C) Input
Make thermocouple connections as illustrated below. Connect the positive
leg of the thermocouple to terminal 2 and the negative leg to terminal 3.

-

+

Thermocouple

FIGURE 2-9

RTD Input
Make RTD connections as illustrated on page 16. For a three wire RTD,
connect the resistive leg of the RTD to terminal 1 and the common legs to
terminals 2 and 3. For a two wire RTD, connect one leg to terminal 2 and
the other leg to terminal 1 as shown. A jumper wire supplied by the cus­tomer must be installed between terminals 3 and 2. Input conditioning
jumper must be positioned correctly (see Appendix B) and Hardware Defini­tion Code must be correct (see Appendix C).

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