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Operation: C1S Version
CENTRON® Meter Technical Reference Guide 23
Resetting Values (ZRO-C2A)
The ZRO-C2A resets the energy register through a direct connection to the connector at the
12 o'clock position on the LCD and R300 modules.
Figure 18: ZRO-C2A Resetter Connected to the CENTRON
The ZRO-C2A is a pocket-sized handheld device for resetting the electronic meter readings
in the CENTRON LCD kWh meter (C1S) and the R300 meter (C1SR). The ZRO-C2A also
resets the tamper indicators in the C1SR.
The ZRO-C2A requires that the meter Not Be Powered . Wait three (3) seconds after power
removal to install the probe to ensure the meter has had sufficient time to power down. The
device connects to the CENTRON meter through a hole in the plastic inner cover located at
the 12 o’clock position on the meter. Extending from the ZRO-C2A is a cable terminating in
a connector which mates to the programming connector of the CENTRON.
Beginning February 20, 2002, the C1SR module for the CENTRON meter uses a new
EEPROM component. This new EEPROM operates at a different voltage level requiring
revision to the CENTRON resetter.
Use of a ZRO-C or ZRO-C2 resetter without the C2A upgrade WILL
CAUSE DAMAGE to the personality modules on both the C1S LCD and
C1SR meters produced after the new EEPROM implementation date;
damaged modules will show “Error” on the display.
All current production resetters and resetters produced after June of 2001 were built with the
C2A upgrade and are labeled accordingly as shown below. Although personality modules
with the new EEPROM are only compatible with the C2A version of the CENTRON
resetter (ZRO-C2A), the older revisions of the personality modules are also compatible with
the ZRO-C2A.