DB500 Series Digital Indicating Controllers

The DB500 series is high-accuracy, high-speed compact controllers with digital displays and an indicating accuracy of ± 0.2% and sampling frequency of about 0.2 second, incorporating high-performance microprocessors with a front panel 48 mm width and 96 mm height. They have excellent functions including an auto-tuning PID function and overshoot suppression function using fuzzy logic. A communications interface is available.

Accurate control with ease of operation
The operation keys required for setting a set value, PID constants, alarms, etc. are simply arranged for accurate control with easy operation.

Auto-tuning PID function
The optimum PID constants can be set automatically, eliminating troublesome setting operations and allowing setup in a short period of time.

Overshoot suppression with Fuzzy Logic
Overshoot which tends to occur due to sudden changes such as a change of the object to be controlled or the change of a set value in a heat treating furnace, etc. can be suppressed by fuzzy logic.

Communications interface
As a communications interface and transmission signal output are available as options, control using a host computer or combination with a recorder can be performed easily.

Zone division control
Using the communications interface, a number of this controllers can be connected to control up to 32 zones, allowing tunnel kiln control, etc. Also, combination with a KP Series Digital Program Setter enables program control of a multi-zone batch furnace.

Indicating accuracy of ± 0.2% and sampling cycle of about 0.2 second
Even though its front panel is small (48 x 96mm), high accuracy and high speed are achieved through use of a high-performance microprocessor and A/D converter.

Signals:
Thermocouples: B, R, S, K, E, J, T, N, U, L
DC voltage: ±10mV, ±5V
DC current: ±20mA
Resistance thermometers: Pt100, JPt100, Pt50

Accuracy rating:
±0.2% of input span ± 1 digit
(For thermocouple inputs, reference junction temperature compensation accuracy is not included.)

Reference temperature compensation accuracy: ±0.8°C

Sampling period: About 0.2 second

Burnout:
Upscale burnout for thermocouple, mV and resistance thermometer inputs
At burnout: Control output 0% and high alarm activation

Scaling: 1999 to 9999

Decimal point of scale: 0 to 3

Displays:
4-digit 2-stage display by 7-segment LED
5 status displays by individual LED

Power Supply: 85 to 264VAC, 50/60Hz (universal power supply)

Ambient temperature: -10 to 50°C

Ambient humidity: -20 to 90%RH (no dew condensation)

Power consumption: Maximum 8VA

Weight: About 400g

Control switching cycle: About 0.2 second

Control system: Current output type PID, On-off pulse type PID, SSR drive pulse type PID (2-position control is possible by internal switches.)

Control set value: Up to 8 (4-digit) values can be set.

Set value change ratio: Setting of slope when the control set point is changed. Ratio 0000 to 9999/minute (0 for step response)

Control setting accuracy rating: ±I digit (relative error to indicating value)

Auto tuning: Provided. PID constants can also be set manually.

PID constants:
P: 0.1 to 999.9%
I: 0 to 9999 seconds (0 for without reset action)
D: 0 to 9999 seconds

Fuzzy function: Overshoot suppression by fuzzy calculation, ON/OFF setting possible (with fuzzy)

On-off pulse type PID
Output signal: On-off pulse conductive signal
Contact capacity Resistive load: 100VAC less than 2A, 200VAC less than 1A
Inductive load: 100VAC less than 1A, 200VAC less than 0.5A
Minimum load: more than 5VDC 10mA
On-off pulse period Variable between about 1 to 100 seconds

SSR drive pulse PID
Output signal: On-Off pulse voltage signal
ON: 14VDC ± 20% (maximum 20mA)
OFF: Less than 0.6VDC

On-off pulse period:    Variable between about 1 to 180 seconds

Alarm points: 2 points

Alarm system: High/low alarms and deviation/absolute-value alarms
With standby function

Alarm output: Form A relay contact output
Contact rating
Resistive load: 100VAC less than 1A,
200VAC less than 0.5A
Inductive load: 100VAC less than 1A,
200VAC less than 0.5A
Minimum load: More than 5VDC 10mA

Communications interface: RS-422A (option)