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Chapter 1 Overview
1-1 General
Temperature limit control
L91
is a safety limit device with a
latching output, that removes power in an abnormal condition
during the process is higher than the high limit set point or
lower than the low limit set point.
The unit is powered by 90-264 VAC or 11-26VAC/VDC supply,
incorporating a 2 amp. form C relay for limit control, an universal
input which is fully programmable for PT100, thermocouple types J,
K, T, E, B, R, S, N, L and 0~60mV, an option port available for one
of the following functions: alarm output, RS-485 communication
interface, DC power supply output, limit annunciator output and
event input. Alternative output options include SSR drive and triac .
The input signal is digitized by using a
18-bit A to D
converter. Its
fast sampling rate (5 times/second) allows the L91 to control fast
process such as pressure and flow.
Digital communication RS-485 is available as an additional option.
This option allows L91 to be integrated with supervisory control
system. An alarm output is another option. A variety of alarm
function and alarm mode can be programmed for a specific
application. The DC power supply output option is used for an
external sensor or transmitter. The event input option can be
programmed for remote reset or remote lock signal input. The limit
annunciator option can be used to control an alarm buzzer.
Three kinds
of method can be used to program L91.
1.
use keys on
front panel to program the unit manually,
2.
Use a PC and setup
software to program the unit via RS-485 port and
3.
Use a pc and
configuration software to program the unit via programming port.
High accuracy, maximum flexibility, fast response
and
user
friendly are the main features of L91.
UM0L911C
5
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