Operation: C1SD, C1ST, and C1SL Versions
CENTRON Meter Technical Reference Guide 5-3
Modes of Operations
When the C1SD, C1ST, and C1SL modules are powered, they automatically enter
the normal display mode, perform self-diagnostics and display any appropriate
error codes. If no error codes are detected, an unprogrammed module will
alternate between CNTRON and Segment Test. A programmed module will
scroll through the Normal display sequence, displaying each selected quantity,
annunciator, and code number for the programmed duration.
The C1SD, C1ST, and C1SL modules each have three modes of operation:
•Normal
•Alternate
•Test
Normal Mode
In Normal mode, the module display automatically sequences through the
programmed displays and annunciators in the programmed sequence. Each
parameter is displayed for the program-specified period (from 1 to 15 seconds),
followed by a blank display for one second. Only the annunciator appropriate to
the selected module display can appear while its data is displayed. Each display
can have a two-digit identifier. If selected, this code can be programmed to be any
number from 00 to 99.
Calculations are performed to obtain programmed quantities. Specific details of
the calculated values are covered under Programmable Functions in this section.
The meter will continue to operate in Normal mode until power is disconnected,
the Alternate display sequence is initiated, Test mode is selected, or an error
condition occurs.
Alternate Mode
The Alternate mode provides an additional set of customizable display items that
are not typically used for billing applications. The Alternate mode is accessible
only from the Normal mode and is activated using either the magnetic reed switch
or a meter programming device. To activate the Alternate mode using the magnetic
reed switch, move a small magnet (approximately 30 gauss) near the reed switch
located at the 10 o'clock position on the side of the module (see Figure 5.2). The
magnetic reed switch can be accessed with the meter cover in place. To activate
the Alternate mode with a programming device, refer to the PC-PRO+
documentation. Immediately upon activation, Alternate mode is indicated by a
flashing ALT annunciator. The ALT annunciator will not appear if there are no
Alternate mode display items programmed.
Once the Alternate mode has been selected, the display will sequence once
through the alternate program items and return to the Normal display sequence.
The quantities displayed are selected during programming and have the same
display timing as in Normal mode. Like the displays in Normal mode, each display
in Alternate mode can have a two-digit identifier, programmable from 00 to 99. The
calculations and operations performed in Alternate mode are identical to those in
Normal mode.
Test Mode
Selecting the Test mode causes the current interval demand to be compared to the
stored maximum demand and the current billing data to be transferred to non-
volatile memory. If the current interval demand value is greater than the maximum
demand, the current interval demand becomes the maximum demand. All Test
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