870 Series Contactor Control Panel
The 870 Series Contactor Temperature Control panel is ON/OFF process temperature control and is recommended for applications that do not demand precise temperature control. Systems with two or more heating stages utilize an electronic sequencer (step controller) driven by a proportional output temperature controller to minimize the amount of load cycling while providing good temperature control. The panel is completely assembled, pre-wired, tested, and ready for trouble free installation and operation. Designed for use in industrial environments and outdoor installations.
Approvals
Standard Features
UL Listed/CSA Approved
NEMA 4/12 Painted Steel Enclosure1
PID self-tuning temperature controller (adjustable process temperature with standard type “J” thermo-couple input)
Over-temperature controller (adjustable temperature limit with standard type “K” thermocouple input)
Disconnecting 50 Amp contactor for resistive loads (per circuit)
120 VAC control power transformer with primary and secondary fusing
Power circuit fusing
Microprocessor-based sequencer (for panels with two or more heating stages)
Door interlocking disconnect switch
Manual reset pushbutton with built-in pilot light (red) for “OVER-TEMPERATURE” alarm
Selector Switch – ON/OFF with built-in pilot light (green) for “POWER ON” indication
Terminals for customer supplied remote interlock
Wiring diagram permanently affixed to the inside of the cover
Short Circuit Current Rating of 5 KA
Optional Features
Control Relays
These relays are activated by safety devices, such as a flow switch or remote shutoff.
Indicator Lights
Additional indicator lights may be specified for visual indication of system status, such as “LOW TEMPERATURE”.
Audible Alarm Package
Includes a horn, pilot light, latching relay and a push button for silencing the horn.
Low Liquid Cutoff
The relay is mounted and wired with sensing probe shipped loose for field installation.
Motor Starter
This package consists of a motor starter for pump motor start-up. Motor starter is internally mounted and field connected to the pump motor.
Special Controllers
The customer may specify the use of special process or over-temperature controllers for a different temperature range, sensor input, control mode, etc.
Panel Heater
A heater and thermostat are provided to prevent condensation and maintain minimum ambient temperature for electrical components.
Wire Markers
Identification markers are attached to both ends of all control and power wires.
Tagging of Internal Parts
Permanent tags are attached to the subpanel near internal parts and marked with component titles as noted on the wiring diagram.
Explosion-Resistant Panel
A cast aluminum enclosure is rated for Class I, Groups C & D and Class II, Groups E, F & G (NEMA 7, 9).
Purged Panels
Type Z for Class I, Division 2 areas Type X for Class I, Division 1 areas.
Optional Temperature Inputs
Type “K” thermocouple inputs or “RTD” inputs.
Stainless Steel Panel Enclosure (NEMA 4X)
This con-struction provides extra corrosion resistance for harsh environments1.
(1) Agency listed for NEMA 4 only.
Special Ratings
65 KA interupting amp rating
