|Model 15A-2 Alarm Controller
The standard alarm will provide a contact closure when the temperature (or
In the non-latching mode of operation, the output relay contacts will
* Solid State
#Input - thermocouple (specify type and range)
# Optional - RTD, 4-20 ma millivolts DC voltage
# Output - SPDT relay 12 amps 250 VAC
# Latching or non-latching operation w/local or remote pushbutton
1. Connect 120 VAC 50, 60 Hz AC power to customer terminals labeled HOT-NEXT.
*Note: The N.O. contact is closed below control point wh the process is cold and will open to remove power from the heater when temperature exceed that set on the control temperature dial. The relay contacts are rated at 5 amps 120 VAC.
4. The remote set point dial is shipped with the cable connected to the
customer terminal strip W(red), CW(white), and CCW(black)
The Model 15A-2 single point RTD alarm is designed to monitor Motor Winding Temperature by means of resistance temperature detector (RTD).
The monitor utilizes a 100 ohm at 0 degrees C. RTD sensor in the motor
winding or end bearing surface. The RTD is connected to terminals labeled S0 and
S2. The terminals labeled P1, P2, and P3 are not used for this application, (
these are used when the alarm set point potentiometer is mounted on a plate for
remote mounting by customer ). The set point dial reads 0-200 degrees C. and is
set at the temperature desired to protect the motor. When the temperature
reaches the set or the dial, the relay will operate and the contacts at
terminals C, N.C. and N.O. will transfer, i.e., the contact labeled N.C. will
close, when the alarm set point is reached.
The Model 15A-2 Thermocouple Alarm is a low cost printed circuit module furnished with dust cover and provisions for either the alarm trip point adjustment on the unit or it can be located remotely with a separate dial and potentiometer. The input can be from any type thermocouple and the output is a 5 amp 120 VAC relay. Thermocouple burnout protection and automatic cold junction are standard features.
The alarm unit consists of a solid state integrated circuit and transformer isolated power supply. The alarm unit will provide contact transfer at the terminals labeled NC, NO, and C. The connection between NC and C will provide a normally closed contact and between NO and C will provide a normally open contact. The dead band between drop-in and drop-out of the relay contacts is approximately 75-100 microvolts.
The 15A-2 alarm can be used either as a non latching ( auto-reset ) type of alarm or a latching type of alarm, which must be reset with a NO pushbutton contact ( momentary contact ) which is connected to terminals labeled RESET ( N.O.). With the latching mode used, the alarm unit will remain in the alarm condition even though the thermocouple temperature drops back below that set on the alarm set point adjustment dial. A jumper must be placed between the reset terminals, if a non latching system is desired.
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