JH1600: Single Trip Alarm
JH1600R: Single Trip Alarm with True RMS Response
JH1620: Dual Trip Alarm
JH1620R: Dual Trip Alarm with True RMS Response
The JH1600/1620 Series alarms monitor an AC voltage or current and provide relay contact HI/LO trip outputs. Fixed-range devices, their input ranges are preset per your order. True-RMS models accurately maintain their setpoints even with varying nonsinusoidal waveforms. Standard models are average-responding, calibrated for accurate RMS sine wave response.
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 JH1600 provides a DPDT relay; Model JH1620, two SPDT relays. AC and DC power options are available.
Specify Option "U"
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: AC signal input.
Pin 5: AC signal input.
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.*
When monitoring the output of a current transformer never use a current-input module. Unplugging the alarm will remove the transformer’s secondary load, resulting in potentially damaging or dangerous voltage spikes (up to several hundred volts).
Instead, use a voltage-input alarm with an appropriate precision external shunt resistor. For 0/5 amps we recommend specifying a 0/250mVac input range with a 0.05 ohm, 0.1% 3 watt external shunt. We offer Part No. R0.05/DS011, a precision shunt resistor assembly preassembled to socket DS011. The socket snaps onto DIN rail or may be surface mounted using screws.