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Precision Digital Corporation PD750, Instruction Manual

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Precision Digital Corporation PD750 Instruction Manual Download Page 15

15

Model PD750, PD751, PD752 Universal Temperature Meters 

Instruction Manual

FAIL-SAFE OPERATION:

The relay coils are energized in the non-alarm condition. In the case of a power fail-

ure, the relays will go to the alarm state. The fail-safe operation can be disabled by

removing jumper J2 located at the front of the relay option card.

OPTION CARD PIN-OUTS

Notes:

1. Alarm acknowledgement terminals (ACK and COM) are located on the meter main board.

2. In the alarm condition, the NC contact is connected to common in the fail-safe mode. 

Relays

Ribbon Cable

Fr

on

t

J2

Sc

re

w

 T

er

m

in

al

s 

(R

ea

r o

f P

C

B)

Relay #1 Common

Relay #1 NC

Relay #1 NO

Relay #2 Common

Relay #2 NC

Relay #2 NO
Relay #3 Common

Relay #3 NC

Relay #3 NO

Relay #4 Common

Relay #4 NC

Relay #4 NO

Function:

Trans

Transmitter -

Pin:

1

2

3

4

5

6

1

2

1

2

3

4

5

6

PD175

PD178

PD177

PD176

PD174

J1

J2

J3

www.predig.com

Summary of Contents for PD750

Page 1: ...r RTD 120 Ω Nickel RTD Displays F or C Factory Calibrated for All Inputs Type T T C and RTDs Displayed to 0 1 NEMA 4X IP65 Front Panel 115 VAC 230 VAC or 24 VDC Power Options 2 or 4 Relays 4 20 mA Output Option PRECISION DIGITAL CORPORATION 19 Strathmore Road Natick MA 01760 USA Tel 800 610 5239 Fax 508 655 8990 www predig com UL Listed PD750 AC Powered Units Only ...

Page 2: ...alibrate unit using a calibrated signal source Alars ALARM and RELAY POINTS Sets alarm and relay set and reset points 0vtPvt 4 20 mA OUTPUT OPTION Programs optional 4 20 mA output values Error ERROR Calibration not successful 0PEN OPEN T C Open thermocouple circuit indicated by flashing display WARNING Hazardous voltages exist within enclosure Installation and service should be performed only by t...

Page 3: ... 115 VAC 3 with 2 relays 14 115 VAC 230 VAC 24 VDC Options Installed Option Model Model Model Card PD751 3 N PD751 4 N PD751 2 N No Options PD751 3 14 PD751 4 14 PD751 2 14 2 Relays PD174 PD751 3 15 PD751 4 15 PD751 2 15 4 20mA Out PD175 PD751 3 16 PD751 4 16 PD751 2 16 2 Relays PD176 4 20 mA Out PD751 3 17 PD751 4 17 PD751 2 17 4 Relays PD177 PD751 3 18 PD751 4 18 PD751 2 18 4 Relays PD178 4 20 m...

Page 4: ...trument restricts modification of calibration values INPUT IMPEDANCE Greater than 100 KΩ POWER AC power 115 VAC 10 50 60 Hz 10 VA 230 VAC 10 50 60 Hz 10 VA DC power 22 28 VDC 6 watts max ISOLATION AC power 1500 VAC DC power 500 VDC NORMAL MODE REJECTION 64 dB at 50 60 Hz ENVIRONMENTAL Operational ambient temperature range 0 to 60 C Storage temperature range 40 to 85 C Relative humidity 0 to 90 non...

Page 5: ...ll always reflect the state of the input to the meter DEADBAND 0 100 User selectable Isolated 4 20 mA Transmitter Output CALIBRATION RANGE The transmitter output can be calibrated so that a 4 mA output is produced for any number displayed on the meter The 20 mA output may correspond to any number displayed on the meter above or below the 4 mA output display O OU UT TP PU UT T L LO OO OP P R RE ES ...

Page 6: ...OWER and SIGNAL CONNECTIONS For DC powered units see diagrams on page 7 Four Wire RTD Connections RTD AC L D T A L U N H O G K I K C S C O A L L L P P C A E Ð O C K X M C H L D IN L L P P C A E Ð O C K X M C H L D IN JP2 JP1 No Connection Three Wire RTD Connections RTD AC JP2 JP1 Two Wire RTD Connections RTD AC L L P P C A E Ð O C K X M C H L D IN L L P P C A E Ð O C K X M C H L D IN JP2 JP1 Therm...

Page 7: ... or smaller wire up to two wires may be connected to each terminal If using AWG 18 or larger wire only one wire may be connected to each terminal 7 Two Wire RTD Connections RTD JP2 JP1 Thermocouple Connections 22 28 VDC 22 28 VDC T C JP2 JP1 Four Wire RTD Connections RTD L D T A L U N H O G K I K C S C O A L L D T A L U N H O G K I K C S C O A L JP2 JP1 No Connection 22 28 VDC Three Wire RTD Conne...

Page 8: ... stops flashing to accept it 2 If the flashing display is not OK or if ENTER was not pressed in time to accept it wait for first digit to flash 3 If a flashing digit is OK press ENTER before it starts to scroll to accept it 4 If a flashing digit is not OK or if ENTER was not pressed in time to accept it wait for the digit to scroll and press ENTER when OK 5 Digits will scroll until ENTER is presse...

Page 9: ...D752 Universal Temperature Meters Instruction Manual Calibration Complete Press ENTER Press ENTER when appears flashes Apply input 1 signal e g 2 V Press ENTER flashes apply input 2 e g 20 V Is entire flashing display OK Press ENTER Wait for digit to flash Has input 2 been calibrated yet Is the flashing digit OK Press ENTER Press ENTER when OK Wait for digit to scroll Is entire display flashing YE...

Page 10: ...ot the desired display or if ENTER was not pressed in time to accept the display wait for the first digit to flash First digit flashes for 3 seconds before it scrolls 4 When digit is OK press ENTER next digit will flash for 3 seconds before it scrolls 5 When flashing digit is OK press ENTER next digit will flash for 3 seconds before it scrolls 6 Repeat step 4 for each remaining digits 7 When last ...

Page 11: ...1330 C 1 C 2 Type T T C 330 to 760 F 2 F 200 to 404 C 1 C 3 Type T T C 330 0 to 760 0 F 2 F 0 1 200 0 to 404 0 C 1 C 4 Type E T C 328 to 1832 F 2 F 200 to 1000 C 1 C 5 Type R T C 32 to 3213 F 5 F 0 to 1767 C 3 C 6 Type S T C 40 to 3214 F 6 F 4 to 1768 C 3 C 7 100 Ω RTD 328 0 to 1382 0 F 0 7 F 0 00385 0 1 200 0 to 750 0 C 0 4 C 8 100 Ω RTD 328 0 to 1382 0 F 0 7 F 0 00392 0 1 200 0 to 750 0 C 0 4 C ...

Page 12: ...emperature in either Fahrenheit or Celsius 12 www predig com Type Type of Input Input 1 Input 2 Check Number Low High Middle 0 Type J T C 32 F 1182 F 600 F 1 Type K T C 32 F 1183 F 960 F 2 Type T T C 32 F 693 F 360 F 3 Type T T C 32 0 F 693 0 F 360 0 F 4 Type E T C 32 F 1652 F 840 F 5 Type R T C 100 F 3000 F 1500 F 6 Type S T C 100 F 3000 F 1500 F 7 100Ω RTD 32 0 F 1148 0 F 590 0 F 0 00385 0 1 100...

Page 13: ... and reset point programming is performed in the Alars routine 1 To enter the Alars routine press ENTER and when Alars appears press ENTER again This starts a scan of the 4 alarm set and reset points The scan sequence begins with a flashing display of alarm 1 set point The 1 LED and S LED are illuminated to indicate the meter is flashing alarm 1 set point value 2 All digits flash for 3 seconds If ...

Page 14: ...uminated the meter is displaying alarm 3 reset point When alarm programming is complete the meter will display the process input signal and the front panel LEDs will indicate alarm status Programming Confirmation To verify that the alarm set and reset points have been programmed as desired press ENTER and press ENTER again when Alars appears Before the display stops flashing 1 set point value pres...

Page 15: ...n card OPTION CARD PIN OUTS Notes 1 Alarm acknowledgement terminals ACK and COM are located on the meter main board 2 In the alarm condition the NC contact is connected to common in the fail safe mode Relays Ribbon Cable Front J2 Screw Terminals Rear of PCB Relay 1 Common Relay 1 NC Relay 1 NO Relay 2 Common Relay 2 NC Relay 2 NO Relay 3 Common Relay 3 NC Relay 3 NO Relay 4 Common Relay 4 NC Relay...

Page 16: ...or to the signal passing through the reset point or if it is not it will auto matically reset when the signal passes through the reset point A manual reset will reset all relays that are programmed for automatic manual reset An array of jumpers located behind the front panel on the Display Board is used to program each relay for either automatic or automatic manual reset Refer to page 21 for front...

Page 17: ...DS Choose R and C as follows R 0 5 to 1 Ω for each volt across the contacts C 0 5 to 1 µF for each 1 A through closed contacts Notes 1 Use capacitors rated for 240 VAC 2 Snubbers may affect load release time of solenoid loads check to confirm proper operation 3 Install the RC network right at the meter s relay screw terminals An RC network may also be installed across the load LOW VOLTAGE DC LOADS...

Page 18: ...A output signal being powered from an external 24 V power supply If the output loop is powered by an external supply the loop power supply must be turned on before the meter is turned on Otherwise the output loop signal may be incorrect Calibration The isolated 4 20 mA output signal is calibrated using the front panel ENTER button and uses the same Single Button Scaling technique that is used to c...

Page 19: ...ext digit will flash for 3 seconds before it scrolls 5 When flashing digit is OK press ENTER next digit will flash for 3 seconds before it scrolls 6 Repeat step 5 for each remaining digits 7 When last digit is OK press ENTER 8 Entire display will flash for 3 seconds Press ENTER within the 3 seconds if OK to complete 4 mA Output Calibration If NOT OK wait for first digit to flash and go to step 5 a...

Page 20: ... this is the desired value Press ENTER within 3 seconds before the entire display stops flashing and the green 20 LED illuminates indicating the meter is displaying the value at which it will produce a 20 mA output Confirm that this is the desired value Press ENTER within 3 seconds before the entire display stops flashing and the meter returns to indication mode LOCKOUT Install jumper JP2 at rear ...

Page 21: ...mains around the meter s case To remove the circuit boards from the case 1 Unscrew the retaining screws holding the circuit boards to the case 2 Remove the screw terminal connectors at the rear of the meter 3 Push the boards through the case by applying pressure to the circuit boards at the rear of the meter Apply pressure evenly to both boards 4 Do not apply pressure to the vertical display board...

Page 22: ...screws in 4 corners of meter and install front cover Option Card Installation MOUNTING DIMENSIONS Mounting Dimensions Notes 1 Panel cutout required 1 772 X 3 622 45 mm x 92 mm 1 8 DIN 2 Panel thickness 0 125 0 250 3 17 mm 6 34 mm 3 Clearance allow 6 inches 152 mm behind the panel 22 Model PD750 PD751 PD752 Universal Temperature Meters Instruction Manual Input Configuration Jumpers Display PCB Ribb...

Page 23: ... Digit Loop Powered NEMA 4X Meter GeneralPurpose PD686 31 2 Digit Loop Powered NEMA 4X Meter FM CSA PD687 31 2 Digit Loop Powered Exp Proof Meter FM CSA PD690 1 8 DIN Analog Input Process Meter UL Listed PD691 1 8 DIN Strain Gauge mV Input Meter UL Listed PD692 1 8 DIN Analog Input Flow Rate Totalizer UL Listed PD693 1 8 DIN Pulse Input Flow Rate Totalizer UL Listed PD696 1 8 DIN Loop Powered Flow...

Page 24: ...l support predig com For Sales Support or to place an order please call 800 343 1001 or 508 655 7300 fax 508 655 8990 e mail sales predig com For Extended Warranty Setup Calibration Services please visit www predig com For an online version of this instruction manual please visit www predig com PRECISION DIGITAL CORPORATION 19 Strathmore Road Natick MA 01760 USA Tel 800 610 5239 Fax 508 655 8990 1...

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