Watlow Electric Micro-Based Autotuning Control SERIES 980/985 - Manual (Page 4)

Chapter 1
Flgure 1 -
Series 980/985 Input
and
Output Overview
Starting Out With The
Watlow Series 9801985,
A Microprocessor-Based Control
Single Input -
Type J, K, T, N or Pt2
Dual Outputs-
PID or ON/OFF
User Selectable
Heat, Cool or Alarm
Output 1 or 2
Percent Power
Output 1, Heating
Auto-tuning
General Description
Welcome to the Watlow Series 980/985, a dual output, single input, micropro-
cessor-based, 1/8 DIN, auto-tuning temperature control, featuring the Auto-
matic/Manual capability with bumpless transfer. In the Auto mode, the control
has closed loop control with sensory feedback, while the Manual mode has
open loop control with user defined output power level. The 980/985 accepts
a Type J, K, T, N, or Platinel2 thermocouple, RTD, or process input. The
primary output is Heating or Cooling, while the secondary output can be Heat,
Cool or Alarm.
With the Series 980/985 you can select either PID or ON/OFF for Output 1 or
Output 2. You may input a complete set of PID parameters for both outputs,
and select automatic tuning for Output 1 from the front panel. This includes
proportional band, reset, rate and cycle time. By setting either output’s propor-
tional band to zero, the Series 9801985 becomes a simple ON/OFF control with
a 3°F or 1.7°C switching differential, 0.3°F or 0.17°C for 0.1 ° RTD.
Operator-friendly features include automatic LED indicators to aid in monitoring
and set-up, as well as a calibration offset at the front panel. The Watlow
Series 980/985 automatically stores all information in a non-volatile memory.
4
WATLOW Series 980/985 User’s Manual Getting Started, Chapter 1