MA-040
–
DGA 900 Plus - Operator Guide - Rev 1.1
4-Mar-22
Page 23 of 99
7
CARD OPTION #2: COOLING STATUS MONITOR
The cooling card option monitors up to four cooling bank units (pumps, fans etc). This
card requires the Thermal Models option as described in Section 6 and improves the
accuracy of the Thermal Models.
The cooling card uses a CT to monitor the current drawn by each cooling bank.
Alternatively, a digital input can be used for each cooling bank to monitor the On/Off
status.
Note:
The four CTs or four digital inputs can be configured to monitor up to four
cooling banks, but not both.
7.1
Sensor Input Configuration
Table 7-1 lists the types of inputs used by the Cooling Status models.
Table 7-1: Cooling Status inputs
Input
Label
Sensor Type
AIN 7
spare
CT
AIN 8
Cooling bank 1
CT
AIN 9
Cooling bank 2
CT
AIN 10
Cooling bank 3
CT
AIN 11
Cooling bank 4
CT
AIN 12
spare
None / CT / 4-20 mA / RTD
DIN 4
Cooling bank 1
12-24 V
DIN 5
Cooling bank 2
12-24 V
DIN 6
Cooling bank 3
12-24 V
Note:
The default range for the Cooling CTs is 0-30 A. Other ranges are available on
request in advance.
Cooling Status requires the wiring of up to four cooling banks using either analogue or
digital inputs. These are to be wired as shown in Figure 7-1 (analogue inputs) or Figure
7-2 (digital inputs).
If installing CTs (analogue input), each CT must be clipped around one of the conductors
feeding a cooling bank (fan set, pump, etc). It should not be installed to monitor a group
of units that can be switched on/off independently of each other.
