© 2011 Hydronix Ltd
7 Riverside Business Centre, Walnut Tree Close, Guildford, Surrey, GU1 4UG, UK
3.3
Connections
The Thermo-Tuff is supplied with a 4 metre unterminated cable. The wire colours are:
When installing the Thermo-Tuff a drip loop should be used to protect the cable gland from any water ingress.
The Thermo-Tuff cable screen must be connected to a good system earth point.
3.4
Output Circuit Design
The output circuit should be designed such that V
A
is
between 10v and 28v DC. This can be checked by
calculating the following:
V
A
= V
PSU
- (I*R)
Where I is 4mA for the maximum V
A
and 20mA for the
minimum V
A
. R is the total resistance of the circuit
including the cable.
4
Troubleshooting
Inaccurate Temperature
Check the PLC input scaling
Check the voltage across the TT01.
Noisy Signal
Check total resistance in the loop.
No Current
Check polarity
Output clamps at less than 20mA
Check the resistance of the cable and the control system input.
Check the voltage across TT01
5
Declaration of conformity
Wire Colour
Description
Red
Current Loop Positive
Blue
Current Loop Negative
Screen
Earth
This device complies with part 18 of the FCC Rules.
This device is designed and manufactured in
accordance with the following directives:
Local regulations regarding the
disposal or recycling of waste
electronic equipment must be
followed.
2004/108/EC
The Electromagnetic Compatibility
Directive and its amending directives
Power
Supply
Thermo-Tuff
Control System
Input
+
-
+
-
+
-
V
PSU
V
A
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