Inside - GE Hydran M2-X Instruction Manual

5. Expansion port: Not used. This is used in Hydran S2 only.
1. Temporary
Plug
2.3.4

Inside

The electronic card cage contains the circuit boards (CPU, sensor card, etc.) and
the battery.
2.3.4.1 Battery
The Hydran M2-X's battery is used to keep the real-time clock functioning and to
retain the parameter values and data of the history files when the ac power is not
available. For the specifications, see Section 9.3; should you need to replace the
battery, see Appendix G.
2.3.4.2 Internal Real Time Clock
An internal real-time clock (RTC) provides a calendar and a permanent clock,
unless the battery is disconnected. The clock uses a crystal oscillator as its time
base; its 0.01 % accuracy (four minutes per month) is independent of the ac power
supply frequency. The calendar accounts automatically for leap years (366-day
year).
To set the Hydran M2-X's date and time, see Section 3.4.3.
The Hydran M2-X's internal clock manages the following functions:
Page 30
2. AC Power Supply
5. Expansion Port
Figure 2-6: Left Side of the Electronic Card Cage
Hydran* M2-X Instruction Manual
3. AC Power Supply
Terminal Block Fuse
4. Alarm Relays
Terminal Block
MA-029 Rev. 1.0, 30-Jul-18