Sunday, 05 June 2011 21:58 Last Updated on Monday, 29 August 2011 01:43 Written by Administrator

DC ALARMS WITH INPUT LOOP EXCITATION
PLUG-IN MODULES

JH1005:  Single Trip Alarm  
JH1025:  Dual Trip Alarm

  • 4/20mA Input Typical, Others Available
  • Provides 24V Power to Input Loop
  • Switch-Selectable HI/LO Trip Function
  • Adjustable Deadband Standard
  • Uses Standard 11-Pin Socket
  • AC or DC Power Options

JH1005/JH1025
PDF
DATA SHEET

JH1005
PDF
MANUAL

JH1025
PDF
MANUAL

Models JH1005 and JH1025 provide 24Vdc loop excitation for a remote 2-wire transmitter, take the signal from that transmitter and provide relay contact HI/LO trip outputs. They also may be used with DC-powered "3-wire" sensors and transmitters whose supply currents do not exceed 25mA.

The alarm trip points are adjustable anywhere within the input range. Deadbands also are fully adjustable, from 0.25% to 100% of span. A slide switch, accessible through the top of the enclosure, selects HI or LO trip operation (on dual alarms, HI/HI, HI/LO or LO/LO). Red/green LEDs indicate alarm status.

Alarm contacts are rated at 5 amps, 230Vac or 30Vdc. Model JH1005 provides one set of DPDT relay contacts; Model JH1025, two SPDT relays. AC and DC power options are available.

ORDERING INFORMATION

Model Number:  Select JH1005 single-trip alarm or JH1025 dual-trip alarm. Add suffix –AC for AC power or –DC for DC power.
Input Range:  Select 4/20mA for use with 2-wire inputs, or any other range allowed by the "Input Capabilities" spec, below.
Trip Point:  If you would like the trip points to be factory set, please specify the following for each trip point. Specify HI or LO trip, specify the setpoint and specify the amount of deadband required (or specify "minimum deadband").
Relay Action:  Standard is Failsafe - the relay is energized under normal conditions and deenergizes upon alarm or upon loss of power. Thus, loss of power is seen as an alarm condition. Or specify Option R (Reverse Acting) – relay is normally not energized and energizes (pulls in) upon alarm trip. Failsafe is provided if not specified.
Power:  Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
Urethane Coating:  

Specify Option "U"

INSTALLATION AND CONNECTIONS

These alarms plug into any standard 11-pin circular ("octal") relay socket. JH Technology offers a socket suitable for DIN-rail or surface mounting (see the Accessories page). Pin connections are:

Pin 1:  Power (AC or, if DC power option, DC plus).
Pin 2:  +24Vdc power to input transmitter. For 2-wire loop, connect to the transmitter’s plus output terminal. For 3-wire transmitter, connect to transmitter’s plus power terminal. 
Pin 3:  Power (AC or, if DC power option, DC minus). 
Pin 4:  Input plus. For 2-wire loop, connect to the transmitter’s minus output terminal. For 3-wire transmitter, connect to the transmitter’s plus output terminal. 
Pin 5:  Input minus. Not used with 2-wire loop. For 3-wire transmitter, connect to the transmitter’s minus (common) terminal. 
Pin 6:  Setpoint 1 relay NO contact.* 
Pin 7:  Setpoint 1 relay moving contact.* 
Pin 8:  Setpoint 1 relay NC contact.* 
Pin 9:  Setpoint 2 relay NO contact.* 
Pin 10:  Setpoint 2 relay moving contact.* 
Pin 11:  Setpoint 2 relay NC contact.*
  • Notes: NO (normally open) and NC (normally closed) refer to the relay state when no power is applied. For Failsafe operation the NO contacts are closed under nonalarm conditions. The NC contacts close upon alarm and upon loss of power. The terms Setpoint 1 and Setpoint 2 refer to dual-trip alarms. For single-trip alarms, both sets of contacts respond to the one trip point.

DETAILED SPECIFICATIONS

Voltage Input Capabilities:  50mV minimum span, +/-20V maximum input. Offset ranges are allowed. (Input Impedance: 200Kohms or greater.)
Current Input Capabilities:  1mA minimum span, +/-25mA maximum input. Offset ranges are allowed. (Input Resistance: Varies with input range. Contact factory for details. 62 ohms for 4/20mA input.)
Input Excitation:  24Vdc regulated. 25mA max. current.
Relay Contacts:  Single Alarm, one DPDT relay. Dual Alarm, two SPDT relays. Contacts rated 5 Amps resistive, 115/230Vac or 30Vdc. 1/8 HP max inductive load at 115/230Vac. Refer to instructions for contact protection when switching inductive loads.
Setpoint Adjustment:  0% to 100% of range.
Deadband Adjustment:  0.25% to 100% of range.
Response Time:  under 100 milliseconds.
Isolation:  Input is isolated from power and from relay contacts. 1,500Vac rms (2,100V peak) breakdown.
Guaranteed Operating Temperature:  -10 to +60 deg. C (14 to 140 deg. F).
Temperature Stability:  +/-0.02% of span per deg. C, or better.
Power Requirements:  AC, 115 or 230Vrms, 50/60 Hz., 2.5V-A. DC, 12 or 24Vdc, 2.5W.