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Specifications subject to change without notice. | USA 160811 | Page 13 of 34
MGC2 – UserManual
PolyGard
®
is a registered trademark of MSR-Electronic GmbH
4.5.3 Latching Mode
Definition of the latching function:
The combination of the latching function and the automatic reset of the horn function cancels the effect of each other
and therefore should be avoided.
Symbol
Description
Setting Status
Function
R 01
Relay No.
Selection relay
No
Latching
Mode
No
No = Latching mode not active
Yes = Latching mode active
Acknowledging a latching relay in the menu “Status Relay” is only possible if the gas concentration is again lower than
the alarm threshold including hysteresis. In this case the status latching occurs in the display. The respective switch-off
delay is without effect when the latching mode is active.
Example: Alarm relay R2 with latching mode
Display in the Menu
Status Relay
R2 R2
R2
R2
R2
R2
Off On
On
On
Latching
Off
Alarm 2
On
Off
Gas concentration higher
lower than threshold
Relay 2
On
Off
Reset in the Menu
Status Relay
or Digital Input
On
Off
4.5.4 Horn Function
The horn function is only activated if at least one of the two parameters (time or digital input) is set. This function has
priority to the latching mode function.
The alarm relay is defined by the following parameters as horn relay with the following possibilities to reset.
• By pressing any of the 6 pushbuttons. (Only possible in the starting menu).
• Automatic reset at the end of the fixed time (active if value >0).
• By an external pushbutton. (Assignment of the appropriate digital input DI: 1-4).
After acknowledge the horn remains reset until all assigned alarms for this relay function have become inactive. After
that it can be triggered anew.
Special Function Recurrence
After acknowledging the relay (by pushbutton or externally) time starts. When this time has run out and the alarm is
still acting, the relay is set again.
Symbol
Description Setting
Status
Function
R 04
Relay No.
Selection relay
Recurrence Reset Mode 0
0 = Reset of the relay after time having run out, via DI (external) or
by pushbuttons
1 = After reset of the relay, time starts. At the end of the set time,
the relay is activated again (recurrence function).
Time
120
Enter time for function automatic reset or recurrence function in sec.
0 = no reset function
DI
0
Assignment, which digital input resets the relay.
