Delta Controls BACstat II Series User Manual

Delta Controls
Document Edition 3.1
Page 27 of 35
OWS Configuration
It is of course possible to configure the outputs via ORCAview OWS, rather than through the keypad
Configuration Menu at the BACstat. Variables AV21 to 23 are used to configure each of the three outputs, but
you must configure these variables in the proper sequence (refer to page 30 for further information). For a
complete list of these variables and other objects, refer to the Object table on page 9. When configuring the
BACstat through the keypad, configuration codes are automatically determined for each of the output
configuration variables. When using ORCAview OWS you manually enter an appropriate configuration code for
each variable (in the proper sequence). The configuration code for an output is a combination of its function and
type (as obtained from the tables on the previous page) according to the following formula:
Output Configuration Code = Output Function Code + Output Type Code
For example: To configure Output 1 on a DNT-T221 as a direct acting analog output for first stage heating, enter
the number 10.4 into AV21 (where 10 is the function and 0.4 is the type, so 10 + 0.4 =10.4).
1. B
INARY OUTPUTS
If the binary output is selected as M
UX it simply transfers the value written to the corresponding variable (AV1,
AV2 or AV3) to the physical output. There is no delay.
If the binary output is controlled internally by the BACstat II, then it will have a delay-on that is specified by its
corresponding setup variable. This value is in seconds.
Physical Output Associated AV Delay Setup Variable
OP1 AV1 AV24
OP2 AV2 AV26
OP3 AV3 AV28
2. PULSE WIDTH MODULATION OUTPUTS (PWM)
The Pulse Width Modulation scheme used on the BACstat II is applicable to the Belimo NM24 actuator.
An analog value is converted to a variable duty cycle pulse that has minimum and maximum pulse times as
determined by setup variables. For example, a Belimo PWM actuator uses a minimum value of 0.59 sec., and a
maximum value of 2.93 sec. The O
N portion of the pulse then stretches from 0% @ 0.59 to 100% @ 2.93.
0.59 Sec.
2.93 Sec.
0%
100%
If the output using PWM is also configured as reverse acting then the output device will be considered to be
reverse acting (i.e., Normally Open) and the input value will be inverted internally before being applied to the
physical output. The actual action of the physical output will be direct.
If the PWM output is not being used for a Belimo device then the minimum and maximum values can be
changed to what ever is required. Also, Belimo actuators may be configured to use a 0.5 to 25.5 signal instead,
which may be more suitable in many cases (i.e., variable values of 50 and 2550).
Physical Output Associated Output AV Min. Setup Variable Max. Setup Variable
OP1 AV1 AV24 AV25
OP2 AV2 AV26 AV27
OP3 AV3 AV28 AV29
Note that the value (in seconds) is shifted by two decimal places when entered in the variable. Default values are,
Minimum PWM Value = 59 Maximum PWM Value = 293

Delta Controls BACstat II Series Specifications

General

Brand	Delta Controls
Model	BACstat II Series
Category	Thermostat
Language	English