Relay Setup - Bacharach MGS-402 User Manual

MGS-402 User Manual

4.2.2 Relay Setup

Additional hardware configuration.
4.2.2.1 Form C Relays
The (3) form C relays that are included in the MGS-402 (fault, low alarm, high alarm) can be configured to be
fail safe (if power is lost on the relay it will be set to its fault or alarm state until power is restored). The fail safe mode
can be configured for each of the individual relays and is done using SW1 settings 1, 2 and 3. If fail safe
mode is desirable for the form C relays change settings to ON.
4.2.2.2 Multiple MGS Gas Sensors
Switch 2 setting 3 is enabled if a second MGS-410 sensor will be connected to the MGS-402 (one sensor is default).
4.2.2.3 Analog Outputs
The (2) analog outputs can be configured to 4-20mA, 1-5V or 2-10V depending on preference. When
configured both analog outputs will be configured the same (i.e., both 4-20mA, both 1-5V or both 2-10V). Using
SW2 settings 4 and 5 set the desired configuration.
Condition
Offline, Warmup
Fault
Under-range
Over-range
Normal
IMPORTANT: The Analog outputs come with a jumper installed from the factory. This ensures that
the MGS-402 does not go into alarm mode upon power but before connecting the analog outputs
– no signal or very small signal is a communications fault. Remove these jumpers after configuring
the analog outputs.
16
4-20 mA
3 mA
1 mA
3.8 mA
20.5 mA
4-20 mA
1100-2570 Rev 1
1-5V
0.75V
0V
0.95V
5V
1-5V
2-10V
1.5V
0V
1.9V
10V
2-10V