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Description
SYSTEM 2000 is totally Australian designed and manufactured. Exclusive circuitry gives the DC2948 Differential Controller all the features that has made this system an industry leader. The DC2948 Differential Controller is part of the System 2000 control range. It is a controller that accepts two resistive sensor inputs and switches a relay output, depending upon the temperature difference between them. The DC2948 can be fitted with up to four relay stages.
Technical Data
| Supply Voltage |
240v ± 10% |
| |
24v ± 10% |
| Power Consumption |
2VA |
| Ambient Temperature |
|
| Operational |
0 to 50°C |
| Storage |
Storage -20 to 60°C |
| Ambient Humidity |
Ambient Humidity max 90% RH |
| Enclosed |
Flame retardant ABS |
| Weight |
max 0.2kg |
| Size |
H: 140mm |
| |
W
: 48mm |
| |
D: 170mm |
| Relay Outputs |
|
| SPDT Contacts |
Voltage Free 250VAC 2.5A |
Relay Cards
The DC2948 relay cards have identical features:
1. Easy plug in replacement with expansion to 4 outlets.
2. 240VAC 2.5 amp ratings with voltage-free contacts.
3. Selection for operation of each relay stage on the D/A or R/A voltage signal.
4. Selection of each stage to operate as ON/OFF or TIME PROPORTIONAL basis with DIP switching. Relays 3 & 4 can be isolated from the internal D/A and R/A signal rails and operated through terminals 11 & 12 by an external 0-10VDC signal. The diagram shows the DIP switch positions.
Input Card
The DC2948 can be used with many different sensing devices provided they are of the resistive type. Zero and span adjustment potentiometers allow for use with thermistors, platinum and nickel resistive detectors. With two sensors connected between terminals 1 & 3 and 2 & 3 and the sensor connected to terminals 1 & 3 reduces its resistance; then the output voltage from terminal 6 increases to 10VDC. To operate one or more relays, terminals 6 & 7 are bridged.
Panel or Rear Mounting
All DC2948 Controllers are suitable for panel or rear mounting. Available in a white custom-made enclosure, the DC2948 can be mounted through the front panel of a switchboard to take full advantage of the digital display. Wiring is easy. The DIN rail (spring loaded clip system) supports the minimum of interconnections with all signal and high voltages at opposite ends.