PEMTECH PT900-12R Manual de usuario
MODEL PT900-12R
12 Channel Gas Monitor & Controller
19” Rack mount
Operator’s
Manual
Revision 3.1
November 2003
Pem-Tech, Inc.
Houston, Texas
U.S.A.
2
NOTICE
PEM-TECH INCORPORATED SHALL NOT BE LIABLE FOR TECHNICAL
OR EDITORIAL ERRORS OR OMISSIONS MADE HEREIN, NOR FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM
THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.
LIMITED WARRANTY
Pem-Tech, Incorporated warrants all the equipment to be free from defects in
workmanship and material. The products will operate in conformance with the
published specifications when subjected to intended and proper usage for the period
of one (1) year from the date of shipment.
The warranty provides only the benefits specified and does not cover defects which
result from acts beyond the control of PEM-TECH including, but not limited to:
damage by accident, negligence, tampering, or failure to operate in accordance with
the procedures outlined in the Operations Manual. PEM-TECH’s liability under no
circumstances will exceed replacement of the unit claimed to be defective.
Tampering with the equipment and altering it for uses other than the intended use or
replacement of parts not supplied by the company, shall immediately void and cancel
all the warranties with respect to the affected products.
The warranties specified herein are in lieu of any and all other warranties, express or
implied. In no event, whether as a result of breach of warranty or alleged negligence,
shall PEM-TECH be liable for special or consequential damages, including, but not
limited to, loss of profits or revenue, loss of equipment or down time costs.
3
SERVICE POLICY
Pem-Tech has service facility at the factory. For all the repairs contact at our toll free
number 1-800-379-3894 or visit our website www.pem-tech.com
For all repairs call us for a Return Material Authorization number (RMA). Inform us
briefly the nature of the problem and obtain shipping address. Properly pack the
equipment before shipping. Also include your complete shipping address and contact
name and phone number.
For non-warranty repairs you must provide the limit to repair costs. State if a quote
for repair cost is required before you can authorize the repair cost. For this an
additional charge may be applicable.
NOTE:
1. For all the repairs under warranty, serial number must be legible on the items
being repaired.
2. Shipping point is FOB Houston.
4
TABLE OF CONTENTS
Specifications 5
Specifications for PT900-12R Rack assembly 5
Specifications for Model PT902M Control monitor 6
Overview 7
Programmable Relays 7
Figure 1. PT902M Control module Front Panel diagram 8
Installation and Startup 9
Figure 2. PT900-12R Rack Assembly 9
Setting Control module Address / ID 10
Modifying Module Address 10
AC or DC power Input 11
Connecting sensors to monitor 11
Alarm wiring 11
Figure 3. System Overview drawing, 12
User termination, control modules in
Rack assembly
Figure 4. Sensor and alarm wiring diagram 13
Figure 5. Wiring auxiliary relay board for common 14
Alarm contacts
Startup 15
Apply Power 15
Normal Operation and alarms
Normal Operation 16
Alarms 16
Alarm Reset 16
Alarm Bypass 16
Programming Alarms 17
Programming Alarm Levels 18
Setting alarms as Latching or Non-Latching 18
Setting alarm contacts as Normally Open or 19
Normally Closed
Figure 6. PT902M Control Monitor circuit diagram 20
Malfunction Condition 22
Parts List 23
5
SPECIFICATIONS
For PT900-12 Rack Assembly
MOUNTING: Standard 19” Rack mount
OPERATING -40 °F to +170 °F.
TEMPERATURE
POWER INPUT: 24 VDC
HUMIDITY: 0 to 100% non condensing
AUXILIARY ALARM 4 Common alarm relays
RELAYS (Optional) Form “C” type rated 10Amps
TERMINATIONS Terminal blocks for sensor and alarm connections
for wire size 16-22 AWG
6
SPECIFICATIONS
For PT902M Control Module
Display Range: 0 to 99
Input Signal: 4-20mA (Optional 1-5 VDC)
Analog Output: Linear 4-20mA output. < 1.5mA when remote
sensor in malfunction.
Maximum of 350 Ohms loop resistance.
Relay Ratings: 4 each Form “C” type relay contacts
Rated 5 Amps each
Low, High, High-High field programmable alarm
levels, Latching or non-latching, Normally open or
Normally Closed contacts
Fault Relay: Malfunction relay activated when remote sensor in
fail. Programmable as Normally open or normally
closed contacts
Visual Indicators: 4 Bright LEDs on the front panel to indicate alarm
status. Amber LED for Low Alarm
Red LEDs for High and High-High and
Malfunction Alarm
Power Input: 24 VDC Nominal (18-28 VDC)
Power is supplied to remote sensor & transmitter
through a 2 Amp miniature fuse
Power Consumption: < 1.2 Watt normal operation for each control
module. Max of 2.1 watt with all relays active.
7
OVERVIEW
Pem-Tech model PT902M is a microprocessor based single channel monitor
that utilizes the latest digital design techniques in instrumentation. The
monitor uses an 8-bit high speed RISC processor with a highly accurate analog
to digital logic. The control module receives signal from the remote gas
transmitter, displays the gas concentration, and generates 4-20mA analog
output. The discrete outputs from 4 alarm relays can be used to activate
external alarm devices. Each control module is connected to a common
24VDC supply at the back of the 19” Rack assembly. The module provides
power to the remote sensor & transmitters via 2Amp miniature fuse.
Standard features are:
•Displays current gas concentration on two (2) Digit Bright LED display .
•Provides a 4-20mA output.
•Low, High, & High-High fully programmable alarm relay contacts.
•Alarms programmable via switches on the front panel
•Sensor Malfunction relay contact.
•Visual alarm indicators on the front panel.
•Alarm RESET and BYPASS switch.
•RS485 Serial Communication for Remote data display
•Master Alarm Reset connection for Remote alarm Reset Switch.
Programmable Relays
Each control module has three (3) programmable relays for Low, High, and
High-High alarms. The alarm relay set points can be programmed via
pushbutton switch provided on the front panel. Sensor and alarm
terminations are provided on the rear of the 19” Rack assembly. A common
terminal is also provided for sensor malfunction (or fault). This terminal is
common to the Fail relays on all the control modules in the system. The
terminal can, therefore, be used as dry contact for a local audible alarm. In
addition jumper blocks are also provided to common all the relays on the
control modules in order to use an auxiliary relays.
For further details refer to section on Programming alarm Relays later in this
manual.
8
ALARMS
NORMAL
BYPASS
PEM−TECH, INC.
LOW
HIGH
HI−HI
MALF
MODEL PT 950
MONITOR
HOUSTON, TEXAS
Di
g
ital Displa
y
Visual Alarm LED indicators
Alarm B
yp
ass Switch
Pushbutton switch
(Alarm Reset & Adjust)
Captive Screw
Handle
Figure 1. PT902M Control Module
Model PT902M
Monitor
9
INSTALLATION AND START UP
Model PT902M Control Module is suitable to mount in a PT900-12R Series
Rack assembly with card guides for main circuit board mounting. On the
front panel a captive screw is provided to secure the control module to the
rack. Do not use excessive force to tighten the screw. Also a handle is
provided to facilitate for easy insertion and removal of the module from the
rack assembly.
PT902M Control module can be connected to any PT205 and PT295 Series
sensor & transmitter. Refer to figure 4 for sensor wiring connections.
Figure 2. PT902M Series Control Modules in a standard 19” Rack assembly.
10
Setting Unit Address ID
***** Skip this section if RS485 or Remote annunciator are not used ******
On PT900-12R Termination board two jumper J1 and J2 located on upper left
corner are used for extended module address. Proper jumpers are requied if
remote annunciators are connected or RS485 Port is used. These jumpers
assign a unique address to a rack with control modules. Two jumper selection
can provide up 48 distinct control module addresses in four (4) PT900-12R
monitors. The following table gives jumper selections for proper addresses.
J1 J2 Monitor Rack # Module / Channel #
OFF OFF 1 CH1 – CH12
ON OFF 2 CH13 – CH24
OFF ON 3 CH25 – CH36
ON ON 4 CH37 – CH48
Modifying Control Module Address:
The control module address can be changed from its default address.
Remember that all control modules in the control panel must have sequential
and distinct addresses to communicate properly with the remote annunciator.
To change the module address follow the steps below.
1. Position the toggle switch on the front panel of the control module to
“NORMAL”.
2. Press and hold the pushbutton switch for few seconds and the module will
display the current address. To change the address push and hold the
switch until the desired address is displayed. The address rolls over to 0
after 99.
3. Release the switch. The module saves the address into its non-volatile
memory. The address is retained until modified again.
Tabla de contenidos
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