|
JH1800: Potentiometer Input Single Trip Alarm
JH1820: Potentiometer Input Dual Trip Alarm
-
Potentiometers
from 100 ohms to 100Kohms
-
Offset
and Expanded Input Ranges
-
Switch-Selectable
HI/LO Trip Function
-
Adjustable
Deadband Standard
-
Quick-Check
Red/Green Output LEDs
-
Industry-Standard
Pinouts (11-Pin Socket)
-
AC
or DC Power Options
|
|
Models JH1800 and JH1820 monitor the position of a potentiometer
or slidewire wiper and provide relay contact HI/LO trip outputs.
Both are fixed-range devices, but you may specify 0/100% input
travel or any expanded range covering a 10% or wider portion of the
travel.
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 JH1800
provides one set of DPDT relay contacts; Model JH1820, two SPDT
relays. AC and DC power options are available.
ORDERING INFORMATION
| Model
Number: |
Select JH1800
single-trip alarm or JH1820 dual-trip alarm. Add suffix
–AC for AC power or –DC for DC power. |
| Input
Pot: |
It is not
necessary to specify the potentiometer’s resistance.
Just make sure it is no less than 100 ohms nor more than
100Kohms. |
| Input
Range: |
Specify
0/100%, or any 10% or wider portion of the travel (for
example, 60/70%). |
| Trip
Points: |
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").
|
| Power:
|
Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
|
| Relay
Action: |
Standard is Failsafe - the relay is energized under
normal conditions and de-energizes 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.
|
INSTALLATION AND CONNECTIONS
These alarms plug into any standard 11-pin
circular ("octal") relay socket. JH Technology offers two
sockets: DS011 for DIN-rail or surface mounting and ST011 for
Snap-Track® mounting (see the Accessories
page).
Pin connections are:
Pin 1: Power (AC or, if DC power
option, DC plus).
Pin 2: Potentiometer clockwise (or
100%) end connection.
Pin 3: Power (AC or, if DC power
option, DC minus).
Pin 4: Potentiometer counterclockwise
(or 0%) end connection.
Pin 5: Potentiometer wiper.
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.*
(*) Note: 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 non-alarm
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
|
Potentiometer
Input Capabilities:
|
May be any resistance between 100 ohms
and 100K ohms. It is not necessary to specify the
potentiometer resistance on your order: end-to-end
resistance does not affect the calibration.
|
|
Input
Capabilities:
|
0 to 100% travel, or any 10%
or wider portion of the travel (for example, 35/45%). |
| 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:
|
Power, 1,500Vac rms (2,100V peak).
Input/Output, 1,000Vac rms (1,400V peak).
|
|
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, 50/60Hz, 2.5V-A.
DC, 12 or 24V, 2.5W.
|
|
