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3-6 Process Alarms 

3-6 Process Alarms 

The output 2 will perform process alarm function and PV.H.A or PV.L.A for 
AL.FN. If PV.H.A is selected the alarm will perform process high alarm. If 
PV.L.A is selected the alarm will perform process low alarm. The process 
alarm sets an absolute trigger level. When the process exceeds that 
absolute trigger level an alarm occurs. The trigger level is determined 
by SP2 (Set point 2 value) and AL.HY (Alarm hysteresis value). The 
hysteresis value is introduced to avoid interference action of alarm in a 
noisy environment. Normally AL.HY can be set with a minimum 
value(0.1).

There are two types of alarm mode can be selected, these are: normal 
alarm and latching alarm.

Normal Alarm: AL.MD= NORM
When a normal alarm is selected, the alarm output is de-energized in 
the non-alarm condition and energized in an alarm condition.

Normal Alarm: AL.MD= NORM

Latching Alarm: AL.MD= LTCH 
If a latching alarm is selected, once the alarm output is energized, it will 
remain unchanged even if the alarm condition  has been cleared 
unless the power is shut off or the RESET key (or remote reset button) is 
pressed.

Latching Alarm: AL.MD= LTCH 

Failure Transfer: AL.FT = OFF or ON
In case of Sensor Break or A-D Failure occurs, the alarm output will be on 
or off according to the selection of AL.FT.

Failure Transfer: AL.FT = OFF or ON

Sensor Break

A-D Failure

SP2 = 200
AL.MD = NORM

Examples:

Examples:

AL.HY = 10.0
AL.FN = PV.H.A

Trigger levels for process high alarm are SP2 and SP2   AL.HY.
Trigger level for process low alarm are SP2+AL.HY and Sp2.

37

UM L41-Rev 2

Summary of Contents for LIMIT L41

Page 1: ...R R RoHS RoHS...

Page 2: ...preset process condition in order to preclude possible damage to products or system It is strongly recommended that a process should incorporate a LIMIT like L41 which will shut down the equipment at...

Page 3: ...ing 2 11 Output 2 Wiring 2 12 RS 485 Chapter 3 Programming Chapter 3 Programming 3 1 Process Input 3 2 Limit Control 3 3 Setpoint Range 3 4 PV Shift 3 5 Digital Filter 3 6 Process Alarms 3 7 RS 485 Co...

Page 4: ...mocouple Input Wiring Figure 2 6 RTD Input Wiring Figure 2 7 Linear Voltage Input Wiring Figure 2 8 Linear Current Input Wiring Figure 2 9 Event Input Wiring Figure 2 10 Output 1 Wiring Figure 2 11 Ou...

Page 5: ...ogram L91 1 use keys on front panel to program the unit manually 2 Use a PC and setup software to program the unit via standard configuration port The input signal is digitized by using a 18 bit A to...

Page 6: ...2 0 None 1 Form C Relay 2A 240VAC 2 Pulsed voltage to drive SSR 5V 30mA 6 Triac Output 1A 240VAC SSR 7 Isolated 20V 25mA DC Output Power Supply 8 Isolated 12V 40 mA DC Output Power Supply 9 Isolated 5...

Page 7: ...2 3 4 ON OFF Access Hole The programming port is used to connect to SNA12A for configuring with a PC The programming port is used to connect to SNA12A for configuring with a PC ON DIP 1 2 3 4 1 4 Keys...

Page 8: ...RESET key is left pressed only ONE reset operation will occur If the unit subsequently goes into a state where reset is required again the RESET key or remote reset contacts must be released opened an...

Page 9: ...es These characters are displayed differently Table 1 1 Display Form of Characters Table 1 1 Display Form of Characters A E I N S X B F J O T Y C G K P U Z c H L Q V D h M R W DISPLAY FORM DISPLAY FOR...

Page 10: ...l segments of display and indicators are left off for 0 5 second All segments of display and indicators are lit for 1 5 seconds A D FAILURE DISPLAY If failure is detected in the A D converter circuit...

Page 11: ...with version 10 Lock R R LIMIT CONTROL LIMIT CONTROL L41 L41 Display the hours used for 1 5 seconds The left diagram shows that the unit has been used for 23456 7 hours since production Lock R R LIMIT...

Page 12: ...on Address for digital communication Baud rate Parity bit Analog output function Analog output low scale Analog output high scale Alarm function Alarm mode Alarm hysteresis value Alarm failure transfe...

Page 13: ...ed and OP1 indicator will go off If the process goes above the high limit set point the relay will be de energized the OP1 indicator will go on and the display will show the process value After the pr...

Page 14: ...go off If the process goes below the low limit set point the relay will be de energized the OP1 indicator will go on and the display will show the process value After the process rises above the low l...

Page 15: ...f the process goes above the high limit set point or below the low limit set point the relay will be de energized the OP1 indicator will go on and the display will show the process value After the pro...

Page 16: ...utput 2 Low HSP L High HSP H Low LSP L High LSP H 100 0 C 212 0 F 0 C 32 0 F 90 0 C 194 0 F 0 J type thermocouple 1 K type thermocouple 2 T type thermocouple 3 E type thermocouple 4 B type thermocoupl...

Page 17: ...10V linear voltage Parameter Notation Parameter Description Range Default Value INPT Input Type Selection 1 0 0 1 UNIT RESO Process Unit Display Resolution 0 Degree C unit 2 Process unit 1 Degree F un...

Page 18: ...e FILT PV Filter Time Constant 3 1 second time constant 0 0 second time constant 4 2 seconds time constant 5 5 seconds time constant 6 10 seconds time constant 7 20 seconds time constant 8 30 seconds...

Page 19: ...19999 High LSP H Low HSP L High 45536 Low LSP L High 45536 0 C 32 0 F 0 C 32 0 F 1000 0 C 1832 0 F 100 0 C 148 0 F OUT 2 Output 2 Function 0 No function 1 DC power supply output 2 Alarm output 3 Limi...

Page 20: ...even parity 1 8 bit odd parity 2 8 bit none parity 0 5 9 6 Kbits s baud rate 3 2 4 Kbits s baud rate 4 4 8 Kbits s baud rate 2 1 2 Kbits s baud rate AOFN Analog Output Function 0 Process value 1 High...

Page 21: ...AL MD Alarm mode 0 AL HY Alarm hysteresis value Low 0 1 High 10 BC 18 0 BF 0 1 AOHI Analog Output High Scale Value Low 19999 High 45536 100 0 C 212 0 F 6 Process value high alarm 7 Process value low...

Page 22: ...ument in areas under hazardous conditions such as excessive shock vibration dirt moisture corrosive gases or oil The ambient temperature of the areas should not exceed the maximum rating specified in...

Page 23: ...r points as they may be internally connected causing damage to the unit Verify that the ratings of the output devices and the inputs as specified in Chapter 6 are not exceeded Except the thermocouple...

Page 24: ...ing diagram Figure 2 4 Power Supply Connections Figure 2 4 Power Supply Connections This equipment is designed for installation in an enclosure which provides adequate protection against electric shoc...

Page 25: ...placement Thermocouple input connections are shown in Figure 2 5 The correct type of thermocouple extension lead wire or compensating cable must be used for the entire distance between the unit and th...

Page 26: ...h 2 7 RTD Input Wiring 2 7 RTD Input Wiring Two wire RTD should be avoided if possible for the purpose of accuracy 0 4 ohm lead resistance of a two wire RTD will produce 1 degree C temperature error 1...

Page 27: ...igure 2 7 Linear Voltage Wiring 1 1 2 2 3 3 4 4 ON ON 0 1V 0 5V 1 5V 0 10V 0 1V 0 5V 1 5V 0 10V 0 60mV 0 1V 0 5V 1 5V 0 10V 0 60mV 0 1V 0 5V 1 5V 0 10V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19...

Page 28: ...ollector signal The event input function EIFN is activated as the switch is closed or an open collector or a logic signal is pulled down Figure 2 9 Event Wiring Input Figure 2 9 Event Input Wiring 1 2...

Page 29: ...put 1 Wiring 2 10 Output 1 Wiring 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 UM L41 Rev 2 Figure 2 10 Output 1 Wiring Figure 2 10 Output 1...

Page 30: ...30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 UM L41 Rev 2...

Page 31: ...6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3...

Page 32: ...d of CC94 1 the cable must be modified according to the following circuit diagram 1 2 3 4 5 6 7 8 9 L41 TX1 TX1 RD 13 14 10 TX2 TX2 TD COM COM GND Female DB 9 Female DB 9 To DTE PC RS 232 Port To DTE...

Page 33: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 33 UM L41 Rev 2...

Page 34: ...parameters RESO IN LO Selects the low scale value for the Linear type input IN LO IN HI Selects the high scale value for the Linear type input IN HI Hidden if T C or RTD type is selected for INPT Hidd...

Page 35: ...1 6 for the limit control operation OUT1 Section 1 6 O1 HY Output 1 hysteresis value The hysteresis value is adjusted to a proper value to eliminate the relay jitter in a noisy environment O1 HY 3 3...

Page 36: ...Digital Filter In certain applications the process value is too unstable to be read To Improve this a programmable low pass filter incorporated in the L41 can be used This is a first order filter with...

Page 37: ...rm and latching alarm Normal Alarm AL MD NORM When a normal alarm is selected the alarm output is de energized in the non alarm condition and energized in an alarm condition Normal Alarm AL MD NORM La...

Page 38: ...Examples Examples 38 UM L41 Rev 2 SP2 200 AL MD NORM Examples Examples AL HY 10 0 AL FN PV H A...

Page 39: ...ding to The controllers support RTU mode of Modbus protocol for the data communication Other protocols are not available for the series RTU Modbus The controller can output retransmit process value vi...

Page 40: ...18 19 20 Two line Transmitter Two line Transmitter 4 20mA Caution Don t use the DC power supply beyond its rating current to avoid damage Purchase a correct voltage to suit your external devices See o...

Page 41: ...orical PV displayed by which shows the maximum process value since the last UNLOCK operation The minimum historical PV displayed by which shows the minimum process value since the last UNLOCK operatio...

Page 42: ...Chapter 5 Calibration Chapter 5 Calibration 42 UM L41 Rev 2...

Page 43: ...f calibration fails return to factory Zero Normal Mode Setup Mode Ad0 ADG CJTL CJG REF SR 4 seconds 2 seconds RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET RESET Step 1...

Page 44: ...in a still air room with temperature 25C 3C Power on unit at least 20 minutes for The unit under calibration is powered in a still air room with temperature 25C 3C Power on unit at least 20 minutes fo...

Page 45: ...en the calibration fails If calibration fails return to factory Input modification and re calibration procedures for a linear voltage or a linear current input Input modification re calibration linear...

Page 46: ...RR 120db Input Resolution Sampling Maximum Rating Temperature Effect Sensor Lead Resistance Effect 18 bits 5 times second 2 VDC minimum 12 VDC maximum 1 minute for mA input 1 5 uV C T C 0 2 uV ohm 3 w...

Page 47: ...r 1 cycle Min Load Current 50 mA rms Max Off state Leakage 3 mA rms Max On state Voltage 1 5 V rms Insulation Resistance 1000 Mohms min at 500 VDC Dielectric Strength 2500 VAC for 1 minute Triac SSR O...

Page 48: ...it LED Displays keypad 4 keys Programming Port For automatic configuration Communication Port Connection to PC for supervisory control Limit Control High Limit Low limit and High Low Limit programmabl...

Page 49: ...unication error attempt to write a read only data or a protected data 14 Don t write a read only data or a protected data to the slave Communication error write a value which is out of range to a regi...

Page 50: ...Table 5 1 Input Characteristics Table 5 1 Input Characteristics 50 UM L41 Rev 2...

Page 51: ...51 UM L41 Rev 2...

Page 52: ...UM L41 Rev 2 Future Design Controls Inc...

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