Alarms Single Frequency JH1700
Monday, 06 June 2011 03:02 Last Updated on Monday, 29 August 2011 01:19 Written by Administrator

FREQUENCY INPUT PLUG-IN ALARM MODULES

JH1700: Single Trip Alarm
JH1720: Dual Trip Alarm
  • Full Scale Frequencies from 10Hz to 100kHz
  • Expanded Scale (Elevated-Zero) Ranges Available
  • Pullup Jumper for Contact-Closure Inputs
  • Adjustable Sensitivity Threshold
  • Switch-Selectable HI/LO Trip Function
  • Adjustable Deadband Standard
  • AC or DC Power Options

JH1700/JH1720
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DATA SHEET

JH1700
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MANUAL

JH1720
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MANUAL

Models JH1700 and JH1720 monitor an input frequency or pulse rate and provide relay contact HI/LO trip outputs. Both are fixed-range devices, with input ranges preset per your order.

A sensitivity adjustment allows threshold optimization for your application. Elevated-zero inputs are available; for example, 50-70 Hz. An internal jumper connects a pullup resistor for use with contact-closure or open-collector inputs.

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 JH1700 provides one set of DPDT relay contacts; Model JH1720, two SPDT relays. AC and DC power options are available.

ORDERING INFORMATION

Model Number:  Select JH1700 single-trip alarm or JH1720 dual-trip alarm. Add suffix –AC for AC power or –DC for DC power.
Input Range:  Specify any frequency range allowed by the "Input Capabilities" spec, below.
Pullup Jumper:  If desired, specify "Pullup. The jumper will be set in the pullup position and the sensitivity adjusted appropriately for contact closure or open-collector (NPN) inputs.
Input Sensitivity:  Normally factory-set for maximum sensitivity. If you wish a specific setting, please specify on your order. (see specifications 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: No connection. 
Pin 3: Power (AC or, if DC power option, DC minus). 
Pin 4: Frequency input. 
Pin 5: Input common. 
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

Input Range Capabilities:  Minimum span 10 Hz. Maximum frequency 100kHz. Low-end input may be zero, or may be as high as 2.5 x span (for example, 20Hz span with 50Hz elevation, for 50/70Hz range).
(Input Impedance: 200kohms or greater.)
Input Amplitude:  350V peak (700V pk-pk, 250V rms sine wave) maximum.
Threshold Adjustment (25 turn trimpot):  Maximum Sensitivity (full clockwise): 50mV pk-pk for frequencies below 1kHz. Increases with frequency to 1V pk-pk at 100kHz.
Minimum Sensitivity (full counterclockwise):8V pk-pk for frequencies below 1kHz. Increases with frequency to 20V pk-pk at 100kHz.
Input Pullup Resistor:  10Kohms to +9V. May be connected using an internal jumper.
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.
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 full-scale frequency per deg. C, or better.
Power Requirements:  AC, 115 or 230Vrms, 50/60 Hz., 2.5V-A. DC, 12 or 24Vdc, 2.5W.