• If you are not knowledgeable about electrical systems, have an electrical professional install this unit. The diagrams in these instructions pertain to the installation of M2 Digital Meters and not to the overall wiring of the vessel. • If an inverter is installed on the vessel, its power leads must be disconnected at the battery before the meter is installed.
Mounting Considerations M2 Digital Meters have three mounting methods: Surface mount, Flat panel mount, and 360 panel mount. When surface mounted per instructions the unit face is waterproof to IP66. Flat panel and 360 mounting systems are not waterproof. The unit should not be flat panel or 360 mounted if used in an exposed location.
AC Functions (1836, 1837, 1838) 1836 AC Ammeter measures the current draw of up to two sources or legs. 1837 AC Voltmeter measures the voltages of up to two sources or legs. 1838 AC Multimeter measures the voltages and current draws of up to two sources or legs. Connections IMPORTANT! The Sensing Description section of this manual gives important details to the location of sensors in the AC and DC electrical systems of the boat.
Detailed Wiring 1836 AC Ammeter 1838 AC Multimeter (North American 120V / European 230V) To loads To loads From Supply From source To loads 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Optional Optional Transformer...
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M2 Relay Connections M2 Meters contains an internal MOSFET relay that can drive external DC loads up to 0.5A. The input is protected with a thermally activated auto-resetting fuse that will protect against shorts. In addition, an inline fuse rated at 5A should be used to protect against shorts. In typical applications, a power source is connected to the Relay+ pin and a load is connected to the Relay Out to Load connection.
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External LED An external LED such PN 8171 can be connected to the Relay Output terminal. If the system is going to operate at more than 24V nominal, an additional 4K Ohms of resistance should be placed in-line with the LED. Supply 8 to 70V 1 2 3 4 5 6 7 8...
External Relay If you need to switch more than 0.5 A, you can use an external relay such as PN 7713, 12V or PN 7717, 24V Remote Battery Switch. Connect the Relay+ terminal to the red control wire. Activating the internal relay will also activate PN 7713. NOTE: 9012, 7700, 7701, 7702, &...
Example Screens From PN 1838 AC Multimeter When an M2 Meter is initially powered up, it will display the Blue Sea Systems Logo,its serial number and its Software revision. After a couple of seconds, the unit will display a high-level System Summary screen.
Setting Alarms The M2 Meter family provides monitoring capability of input channels. The meter can monitor Voltage, Current, and Frequency. Alarms are triggered if a channel is above or below a certain user selected threshold value. (Note: not every meter supports every alarm) The following example indicates how to setup an over voltage Alarm.
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Relay Setup & Control M2 Meters provide an option to control an external relay. The M2 can trigger the relay based on Voltage, Current, or Frequency. These relay options can be set from the Relay Setup menu. To get there, first navigate to the Setup menu. Then scroll to Relay Setup and press the Select button.
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Notification The Notification setting controls whether or not a notification is displayed when a relay is activated. Notifications will show which relay threshold was surpassed and for which channel. Scroll to Notification and press Select to change the setting. Press the LEFT ← or RIGHT → arrow buttons to choose either ON or OFF.
Clearing Relay Notification If the Notification option is set to ON then any time the relay is opened (Normally Off) or closed (Normally On). A message will be displayed on the main screen. Pressing a key will clear this notification. If Silence is set to ON then the relay will be opened (Normally Off) or closed (Normally On). Viewing Relay Status For any active alarm, the parameter will flash if it is displayed.
Changing System Labels The M2 allows the user to change the labels that are displayed above each channel. Each channel can have a maximum of 16 characters however in the summary screens only the first 11 or 12 characters of the channel label are displayed.
6. Answer Yes to “Are you sure you want to update the Flash?” 7. The red LED on the M2 will rapidly flash for about 10 seconds. 8. If the upgrade was successful, a message with the new software version will be displayed.
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