Brainchild BTC-2500 - Cool Only Control

UM25001D
5 4 Cool Only Control5 4 Cool Only Control
A BTC-2500 is used to control a refrigerator at temperature below 0 C. To
avoid the set point adjustment beyond the interesting range, SP1L is set at -
10 C and SP1H is set at 0 C. The temperature is lower than the ambient, a
cooling action is required. Hence select DIRT for OUT1. Since output 1 is used
to drive a magnetic contactor, O1TY selects RELY. A small temperature
oscillation is tolerable, hence use ON-OFF control to reduce the over-all cost.
To achieve ON-OFF control, PB1 is set with zero and O1HY is set at 0.1 C.
B
BB
B
A BTC-2500 is used to control a refrigerator at temperature below 0C.To
avoid
the set point adjustment beyond the interesting range, SP1L is set at -
10 C
and SP1H is set at 0C.The temperature is lower than the ambient, a
cooling
action is required. Hence select DIRT for OUT1. Since output 1 is used
to
drive a magnetic contactor, O1TY selects RELY. A small temperature
oscillation
is tolerable, hence use ON-OFF control to reduce the over-all cost.
To
achieve
ON-OFF
control,
PB1 is set with zero and O1HY is set at 0.1 C.
B
BB
B
Setup Summary:Setup Summary:
FUNC=BASC
IN1=PT.DN
IN1U= C
DP1=1-DP
OUT1=DIRT
O1TY=RELY
SP1L=-10 C
SP1H= 0 C
FUNC=BASC
IN1=PT.DN
IN1U=
C
DP1=1-DP
OUT1=DIRT
O1TY=RELY
SP1L=-10
C
SP1H=
0 C
User Menu:User Menu:
PB1=0 ( C )
O1HY=0.1 ( C )
PB1=0 ( C )
O1HY=0.1
( C )
Cooling Control ExampleCooling Control Example
Figure 5.6Figure 5.6
RTD
Refrigerator
8 9
10
5
6
Mains
Supply
Mains
Supply
87
ON-OFF control
Direct Control Action
ON-OFF control
Direct
Control Action
O1
O2
A1
C