Technical data

Installation & Operation Manual GM-TTT
Page 64
5.4 Option T: Battery-Buffered Clock Module
This option can be installed instead of using an external reference time input or any other
built-in solution. The clock module has a real time clock with a battery backup, counting time
and date even if the GM-TTT has been switched off. So the GM-TTT is able to start with a
valid real time after power-on.
The clock module counts UTC, i.e. a time zone without Daylight Saving Times.
Time and date of the clock module is set simultaneously with setting time and date of the inter-
nal clock: menu SET - ... - TIME and SET - ... - DATE, or with an operational unit of the MTD
system, if GM-TTT works as the central unit of the MTD Time-Timer-Time Code system.
This type of reference time input requires to set the following parameters:
Menu REFER - MODE 1:
Digit 8
Digit 7 Digit 6 Digit 5 Digit 4 Digit 3 Digit 2
Digit 1
, i.e. GM-TTT accepts time and
date only after power-on. The time zone of the reference time is UTC, the time of the internal
clock of GM-TTT is defined by the parameters of submenu ZONE (offsets for normal time and
DST).
Clock Module
LED green
Battery
LED red
The green LED of the clock module flashes every
second, indicating that a valid time and date will be
transferred. The red LED lights up in case of an
error. The clock module has not received a valid
time if the red LED flashes instead of the green LED.
This occurs for example after replacing the battery.
Technical data of the clock module:
Accuracy (leading edge of P_SEC) at delivery adjusted to <2ppm/25°C
at 15-35°C: <4ppm
at 10-40°: <8ppm
at 5-45°: <20ppm
aging (first year): < 3ppm
Battery 3 V lithium, working life: 10 years
Replacing the battery
CAUTION: Danger of explosion if battery is
incorrectly placed. Replace only with the same or
equivalent type recommended by the manufacturer.
Discard used batteries according to the manu-
facturer’s instructions.