E-Mon E-PS-E-RTU-N - Manual (Page 33)

Chapter 2 Installation I/O Connections
PowerSmart+ Power Quality Meter 33
TOU module – RTC and 4 Digital Inputs
The TOU provides a battery-operated real time clock (RTC) with four
optically isolated inputs for status monitoring, time synchronization, pulse
counting, and external power demand period.
Digital Inputs
Figure 2-25: TOU Digital Input Connection
TOU – Battery Replacement
WARNING!
Only qualified personnel familiar with the instrument and its
associated electrical equipment must perform the RTC battery
backup replacement.
To replace the CR1632 RTC battery:
1. Remove the TOU module from the PowerSmart+ PQM
compartment
2. Open the TOU MODULE case by applying a flat screwdriver at
three snap-in slit (1, 2 and 3), as shown in Figure 2-26.
3. Remove the old battery by lifting up the battery holder
retractable tab.
4. Place the new CR1632 battery into the battery holder while
holding up the battery holder retractable tab in such a way that
the (+) battery pole is toward the battery holder, as shown in
Figure 2-26.