Chapter 2 Installation I/ O C O N N E C T I O N S
38 PM130 PLUS Powermeter Series
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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