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Cut In Lower Than Cut Out
Figure 6-2 - Cut In Setpoint Lower Than Cut Out
When the Cut In setpoint is lower than the
Cut Out setpoint, the Sensor Control output turns
ON when the sensor input goes lower than the
Cut In setpoint. The Sensor Control output
remains ON until the input rises above the Cut
Out setpoint, at which time the output turns OFF.
(See Figure 6-2 for an illustration).
6.4.2. Motor Room Temperature
Control
Part of the capabilities of sensor control
involves the control of temperature in a motor
room.
The CUB-II takes a "zone control" approach
to controlling motor room temperature. All the
CUB-IIs attached to a single E2 or Einstein can
be divided into up to four "zones" (physically,
up to four different motor rooms). In each zone,
one CUB-II must be set up with a sensor control
input designated as "Motor Room Temp." This
temperature value is shared with E2 or Einstein's
Global Data handler, and passed back down
through Global Data to all CUB-IIs that share
the same zone number.
In an E2 or Einstein that has CUB-II boards
attached to it, the Global Data values SPARE
ANLG01 through SPARE ANLG04 are reserved
for motor room temperatures in zones 1-4. If, for
example, a CUB-II in zone 2 has a "Motor Room
Temp" sensor control input, E2 or Einstein will
18 • MultiFlex CUB-II and CUB-TD I&O Guide
read this value into Global Data as SPARE
ANLG02. All other CUB-IIs that are assigned to
zone 2 will read SPARE ANLG02 as the motor
room temp.
6.4.2.1.
Exhaust Fan Control
The CUB-II in each zone that is reading the
motor room temp may also use the input to per-
form Cut In/Cut Out control of a single output.
This can drive an exhaust fan or similar HVAC
device.
6.4.2.2.
Example of a Motor Room Zone
Temperature Configuration
An example of how motor room temperature
zone control is shown in Figure 6-1. In this
example, there are two motor rooms with five
CUB-IIs each. Each motor room has an exhaust
fan that is controlled by the same CUB-II that
has the motor room temp probe. This fan is con-
trolled entirely by the individual CUB-II.
The motor room temperature for Zones 1 and
2 are passed to E2 or Einstein as the Global Data
values SPARE ANLG01 and SPARE ANLG02.
All the CUB-IIs in Zone 1 except the one with
the sensor will read the SPARE ANLG01 Global
Data value as their zone's motor room temp, and
will display this value on their HHT status
screens.
WARNING: If you are using CUB-IIs, you
cannot use Global Data's SPARE ANLG 01
through 04 inputs for any purpose other than
motor room temperature control. If you need to use
some of Global Data's "Spare Analog" slots to share
values between E2s or Einsteins, use SPARE ANLG 05
through 08.
026-1705 Rev 7 06-APR-2010
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