Chapter 2 Installation I/O Connections
PM130 PLUS Powermeter Series_Installation Operation and Manual 42
2.6.5 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 2-30 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 PM130 PLUS 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 2-31.
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 2-31.
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