D396-20-880 Issue H
Page 16
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Installation
3.3
Fit the Controller
CAUTION
You must allow the correct clearances for air circulation and you must fit the Controller onto a thermally
conductive surface. If you do not, the performance and reliability of the Controller may be affected at high
operating temperatures.
You must fit the Controller in a rack or cabinet. You can operate the Controller in a horizontal position or in a vertical
position with the side vents at the top.
When you fit the Controller, you must allow 15 mm clearance at the sides of the Controller for air circulation and
you must allow 75 mm clearance at the back of the Controller for the cables.
You must firmly fit the Controller onto a thermally conductive material, for example aluminium or steel. The location
of the bottom panel fixing-holes are shown in
.
3.4
Introduction to Controller electrical connections
When you make the electrical connections to the Controller described in the following sections, refer to
for
full details of the logic interface connections and refer to
which shows a schematic diagram of the electrical
connections. You must provide suitable strain-relief on the cables which you fit to the Controller.
WARNING
The Controller contains electrolytic capacitors and, under certain fault conditions, may emit
dangerous fumes. Ensure that the Controller is operated in a well-ventilated area.
Table 10 - Logic interface pins
Pin number
Signal
Polarity
*
*
+ = positive, - = negative, N/A = not applicable.
Signal type
1
TMP On (low when pump is on)
N/A
Status
outputs
7
TMP Fail (high when fail condition exists)
N/A
8
Status output common
N/A
15
TMP Normal (low when pump is at Normal speed)
†
†
This output is only TTL compatible when the current drawn is < 1 mA. See
for more information.
N/A
3
Start/Stop: Close for Start
+
Control
input
4
-
11
Standby: Close for Standby
+
Control
input
4
-
10
RFI screen
N/A
N/A
5
Vent-valve electrical supply: 24 V
+
Supply
13
Vent-valve control
‡
‡
This supply line is raised to +24 V to de-energise the valve coil and vent the system.
-
6
Air-cooler electrical supply: 24 V
+
Supply
14
Air-cooler electrical supply: 0 V
-
9
Pump speed or power
+
Analogue
output
2
-
