Cool Only Control - Brainchild BTC-2500 User Manual

5 4 Cool Only Control

5 4 Cool Only Control
A BTC-2500 is used to control a refrigerator at temperature below 0 C. To 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 - avoid the set point adjustment beyond the interesting range, SP1L is set at -
B B
10 C and SP1H is set at 0 C. The temperature is lower than the ambient, a 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 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 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. 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. To achieve ON-OFF control, PB1 is set with zero and O1HY is set at 0.1 C.
Setup Summary: Setup Summary:
FUNC=BASC FUNC=BASC
IN1=PT.DN IN1=PT.DN
IN1U= C IN1U= C
DP1=1-DP DP1=1-DP
OUT1=DIRT OUT1=DIRT
O1TY=RELY O1TY=RELY
SP1L=-10 C SP1L=-10 C
SP1H= 0 C SP1H= 0 C
User Menu: User Menu:
PB1=0 ( C ) PB1=0 ( C )
O1HY=0.1 ( C ) O1HY=0.1 ( C )
B B
Refrigerator
RTD
8 9
1
2
A1
B B
B B
10 5 6
C
UM25001D
ON-OFF control ON-OFF control
Direct Control Action Direct Control Action
Mains Mains
Supply Supply
Figure 5.6 Figure 5.6
Cooling Control Example Cooling Control Example
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