Ziegler DigiTrace RAYSTAT-ECO-10, Руководство пользователя

Страница: 7 / 36

7
T sensor
Type: 3-wire Pt 100 according to IEC Class B
Sensor head: 50 mm x ∅ 6 mm
* An external Pt 100 sensor can be connected, the sensor cable can be
extended with a 3-core shielded cable of 20 Ω max. per conductor (e.g. up
to 150 m with a 3 x 1.5 mm 2 cable)
Functional description
The Raystat-ECO-10 Controller is used to control heat-tracing freeze pro-
tection systems based on ambient temperature. The controller adjusts the
power of the heating cable by energizing the circuit for a percentage of a
complete cycle. This percentage is determined based on the ambient tem-
perature, the set point, and the minimum expected ambient temperature. The
full cycle time is influenced by pipe diameter.
For example, if the ambient temperature is halfway between the minimum
expected ambient temperature and the set point, the heating cable will be
energized for 5 minutes and be off for 5 minutes (for the smallest pipe size
selected). The actual duty-cycle periods and ratios vary, depending on the
ambient temperature and the above mentioned parameters. This algorithm is
called Proportional Ambient Sensing Control (PASC).
If you are unsure about the min. expected ambient setting, set it to a higher
rather than a lower value to prevent freeze-ups.
In the event of an error, the alarm relay switches and an error code shows on
the display. It is possible to program the status of the heating cable (ON or
OFF) in case of a sensor error.
The unit is fitted with a battery so that programming can be done on the
bench prior to mounting in the working location (see Operational description,
page 11).
Display
RAYSTAT-ECO-10 has a digital display. The three left hand digits 9a are the
value display and the right hand digit 9b is the status display.