MSA ZGARD C Instruction Manual Download Page 11

 

 

Section 3 

ZGARD C 1-Channel Controller 

Installation and Setup 

 

 

 

 
 
 
 
 
 
 
 
 

Alarm Relay Latch Set-up: 

Normally all relays return to their inactive state once an Alarm event has cleared. The alarm relay can 
be made to latch in the activated position even after all alarms have cleared. Inserting jumper H1-9 (IN) 
will lock in the alarm relay so it will remain latched after all alarms clear until the reset button is pressed. 
Note that the Alarm LED on the front panel will not follow this action.  

 

 
Analog Output Adjustment:  

The analog output (4-20mA) is factory calibrated, and should not require adjustment. It does not drift 
because it is digitally controlled by the microprocessor. If adjustments are required, a ZERO and SPAN 
potentiometer can be used to perform these. 

 

To adjust the output to 4-20mA for 0-100% input (factory setting) when using a 4-20mA type sensor, 
apply a 0% (4mA) signal to the input and adjust the ZERO potentiometer until the output reads 4mA. 
Then apply a 100% (20mA) signal to the input and adjust the SPAN potentiometer until the output 
reads 20mA.  
 
To adjust the output to 4-20mA for 0-100% input (factory setting) when using RS485 type sensors, a 0% 
and 100% input can be obtained by making sure the sensor is not exposed to any gas or ideally by 
disconnecting the sensor (the Sensor Fail will then activate - ignore it) for a 0% signal, and by inserting 
the 100% jumper on the back of the sensor board for a 100% signal. 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

3.4

H1  

 

PARAMETER 

SETUP 

 

   

 

   

 

 

RELAY NORMALLY EN/DE (IN/ OUT) 

 

 

DISPLAY RANGE B/A (IN/ OUT) 

 

 

DELAY  5MIN. / POT (IN/ OUT) 

 

 

HORN  SOLID / VAR (IN / OUT) 

 

 

WARNING  POT / 35% (IN / OUT) 

 

 

ALARM  POT / 50% (IN / OUT) 

 

 

ALARM LATCH (IN) 

Summary of Contents for ZGARD C

Page 1: ...warranties made by Mine Safety Appliances Company with respect to these Products are voided if the products are not installed used and serviced in accordance with the instructions in this user guide...

Page 2: ...ufacturers of such components THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY AND IS STRICTLY LIMITED TO THE TERMS HEREOF SELLER SPECIFICALLY DISCLAIMS ANY WARRANTY OF...

Page 3: ...luded as part of the installation and as a routine inspection of the system 5 Use only genuine MSA replacement parts when performing any maintenance procedures provided in this manual Failure to do so...

Page 4: ...g Specifications and Features 4 0 Installation and Set up Display Mode Number of Remote Sensor Inputs 4 1 Relay Function Setting up the Warning and Alarm Delays 4 2 Audible Alarm Device Setting Warnin...

Page 5: ...ZGARD C Controllers This is a quick guide for determining the functionally capability and configuration of each controller ZGARD C CONTROLLER MODEL 1 CHANNEL 4 CHANNEL Number of Remote Sensors 1 4 Po...

Page 6: ...controller according to the required application Also refer to the ZGARD C controllers Installation Outline drawings located in the back of this manual which provides important information regarding...

Page 7: ...lue between 0 and 100 Full Scale FS Delay Function There are two user jumper selected methods for setting the ZGARD C 1 Channel controller warning and alarm delays The first uses pre programmed fixed...

Page 8: ...ct the actual operating range of the incumbent remote gas sensors There are two display mode options A and B and is selected by placing Jumper H2 in the required position If jumper H1 4 is OUT Range A...

Page 9: ...allows adjusting of the delays from 0 to 10 minutes via two potentiometers labeled Warning Delay Alarm Delay To select the adjustable delay jumper H1 5 is NOT inserted Removing the jumper activates t...

Page 10: ...button will silence the audible alarm but will not have any effect on the alarm LED on the front panel or the alarm relay Warning and Alarm Set Points There are two methods for setting the warning an...

Page 11: ...SPAN potentiometer can be used to perform these To adjust the output to 4 20mA for 0 100 input factory setting when using a 4 20mA type sensor apply a 0 4mA signal to the input and adjust the ZERO pot...

Page 12: ...adjustable on the controller and can be set to any value between 0 and 100 Full Scale FS Delay Function There are two user jumper selected methods for setting the ZGARD C 4 Channel controller warning...

Page 13: ...a special Display Range that displays the first two channels 1 2 as 0 10 0ppm and the second two channels 3 4 as 0 100ppm This is useful for Carbon Monoxide CO Nitrogen Dioxide NO2 applications Remote...

Page 14: ...of the delays from 0 to 10 minutes via two potentiometers labeled Warning Delay Alarm Delay To select the adjustable delay jumper H1 5 is NOT inserted Removing the jumper activates the associated pot...

Page 15: ...nce the audible alarm but will not have any effect on the alarm LED on the front panel or the alarm relay Warning and Alarm Set Points There are two methods for setting the warning and alarm set point...

Page 16: ...can be used to perform these To adjust the output to 4 20mA for 0 100 input factory setting when using a 4 20mA type sensor apply a 0 4mA signal to one of the input and adjust the ZERO potentiometer...

Page 17: ...RESET button to silence 7 Allow the associated remote gas sensors to stabilize Refer to the appropriate gas sensor manual for further details Depending on the controller s warning alarm and delay sett...

Page 18: ...nuine MSA replacement parts when performing any maintenance on the ZGARD C Controllers Failure to do so may seriously impair instrument performance Repair or alteration of the ZGARD C controllers beyo...

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