SyxthSense Ltd
Copyright © 2020 SyxthSense Ltd. All rights reserved - 11/2020
PS
CT2.161
- 16/34
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www.syxthsense.com
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E:
NOTE: With SRC-703 you can also configure Y1 to ’HEATING1 or COOLING1 STAT’. With this
configuration RELAY3 becomes also as ON/OFF valve output. Therefore the SC-703 controller
can control both heating and cooling ON/OFF valves (and EC Fan via 0-10Vdc output).
PWM Control / Digital
Outputs
(SRC-702/SRC-704H)
The SRC-702/SRC-704H controller has two digital triac outputs. The digital outputs are used for PWM
control for heating and cooling valves. The PWM period is set in the INPUTS/OUTPUTS PWM Period
Setting. The below diagram illustrates the principle of the PWM control..
HEA
TING
ST
AGE1
OUTPUT
HEATING
STAGE 1
calcSP
HDz
°C / °F
100%
0%
+
-
PWM CONTROL EXAMPLE (HEATING STAGE1 - DO1)
HDz = COMFORT Heating Deadzone
CDz
calcSP = Calculated Setpoint
230 Vac L
Transformer
230 Vac N
Fuse
24Vac
0Vac
Clg Actuator
Thermic
(PWM)
Absolute
Max. 27.6VAC
G0
G0
485B-
485A+
Din
RI1
Y1
24V
~/
DO2
DO1
RI2
SRC-602
GO
Htg Actuator
Thermic (PWM)
60%
Example:
Htg1 = 60%
PWM Output
60% of time: ON = 0.6 * 30 = 18s
40% of time: OFF = 0.4 * 30 = 12s
DIGITAL PWM OUTPUT (DO1)
OFF
ON
TIME (seconds)
PWM Period Setting: 30s (Default)
18s
12s
NOTE:With SRC-703/704H analogue outputs Y2 & Y3 are not available. Y1 is available for EC
Fan control (or other valid output control - see Y1 options). With SRC-704H the Y1 is set as
default ’Modulating Fan’, and the device does not have 0-10Vdc outputs.
NOTE:Please note that DO1 and DO2 are 24Vac Triacs switching to 0V. Please follow the above
wiring diagram.
Belimo 6-Port Control Mode
The SRC-700 controller can be configured to control Belimo 6-Port valve by selecting
6-Port
or
6-Port
Reverse
mode for the analogue output (Y1/Y2/Y3). The diagram below illustrates the operation.
Note: Analogue Output Scaling/Anti-JAM is not available in the 6-Port and 6-Port Reverse
modes. Number of Heating and Cooling Stages must be set at minimum to one.
AntiJAM Valve Exercise
Function
If the AntiJAM function is enabled the controller monitors for inactivity. If the control outputs have been
fully closed or fully open more than the AntiJAM period, the controller will open/close the outputs to by
30% for a short period of time. The AntiJAM function is enabled through the configuration parameters
by selecting the required AntiJAM period by days.
Alarm Display
The SRC-700 controller provides two
Alarm Modules each of which can be
configured to detect and display alarm
condition on either CO2, Humidity or
Temperature Sensor (internal or external
depending on which is being used). The
alarm function can be disabled by setting
the alarm source as “NONE”. Alarms are
disabled by default.
CO2 AMBER ALARM
CO2 RED ALARM
Target
21
.5
°C
Target
21
.5
°C
A
A
CO2
950
ppm
CO2
1300
ppm
Each Alarm has three alarm states – No
Alarm, Amber and Red. When in alarm
the alarm is displayed by alarm bell in
ACTION CIRCLE. The ACTION CIRCLE
rotates all active measurements so the
alarm is displayed when the
corresponding measurement is
displayed.
HIGH LIMIT ALARM
DEMAND
nSP
HDz/CDz = Comfort Zero Energy
Deadzone (Default 0.5°C)
nSP= Nominal Setpoint (Default 21°C)
HDz
MEASURED
TEMPERATURE
100%
0%
+
-
CDz
Zero Energy
Deadzone
HEA
TING ST
AGE 1
COOLING ST
AGE 1
2V
7V
5V
10V
SEQUENCE 1
SEQUENCE 2
MAX
FLOW
MIN
FLOW
6-WAY VALVE CONTROL
SIGNAL (Y1/Y2/Y3)
6-WAY; HTG1 = 5V to 2V, CLG1 = 7V to 10V
6-WAY REVERSE; HTG1 = 7V to 10V,
CLG1 = 5V to 2V
ANALOGUE OUTPUT MODES
