Revision 1.1
Page 7 of 21
Warning
Please Note
The specifications of the product detailed on this
Set-Up Guide may change without notice. RDM
Ltd. shall not be liable for errors or for incidental
or consequential damages, directly and indirectly,
in connection with the furnishing, performance or
misuse of this product or document.
Ensure that all power is
switched off before
installing or maintaining
this product
Mercury 2 & Intuitive Mobile Controller User Guide
www.resourcedm.com
Input and Output Allocation Tables
The following tables indicate; on a controller type basis, the functions of the inputs and outputs. Also shown are the digital inputs that are
derived by switching in a fixed value resistor across the input.
Input / Output allocation table
TYPE
Integral Case
Types 1&2
Alarm
Action
Plant Input
(Switched Resistors)
Input 1
Air on Temperature
Yes
Input 2
Air off Temperature
Yes
Input 3
Compressor A Discharge Temperature
Yes
Plant fault 1 or External Defrost Input **
Input 4
Compressor B Discharge Temperature
Yes
Case Clean Switch
Input 5
Defrost Termination or Monitor probe (if used)
Conditional*
Plant fault 2
Input 6
Logging Probe (If fitted)
Conditional*
Relay 1
Compressor A
N/A
Relay 2
Fans
N/A
Relay 3
Lights/Alarm Relay
N/A
Relay 4
Compressor B
N/A
Relay 5
Defrost Heater
N/A
* Alarm on monitor probe only if used
** Defrost type must be set to remote in parameters.
Switched Resistor Values
For PT1000 probes use 820 Ohm switched resistors. For NTC2K, NTC2K25 and 3K probes use 590 Ohm switched resistors. For 5K and
6K use 1K Ohm switched resistors. For NTC10K probes use 2k7 Ohm switched resistors. For NTC10K(2) probes use 2k2 Ohm switched
resistors. The resistors used must have a tolerance of 1% or better and the resistor must have a power rating of 0.25W. For improved
accuracy whilst using switched resistors RDM recommend resistors with 0.1% accuracy are used. Note the switched resistor features will
not
function when using 470R or 700R probes. When a resistor is switched across the appropriate input it signals to the Mercury to
enable the switched resistor function described for that input whilst still recording the probe temperature on the input.
Temperature range for all probe types is -49
o
C to +127
o
C
for probe inputs which do not have a secondary function (switched resistors).
Inputs which have a secondary function are restricted to -42
o
C to +60
o
C. If the full temperature range is required on all inputs and no
switch resistor features are needed then please see Switch Resistor parameter P-19
Note: switched resistors will operate in LT (Low Temperature) and HT (High Temperature) applications using PT1000, NTC2K or
NTC2K25 probe types only. For all other probe types the switched resistor inputs will work in HT applications only.
Setting up the controller
Access to the controller can be achieved several ways
Through the front mounted buttons
Direct access by PC into the side comms port. This requires the Communicator software package available free on the RDM
website
Through legacy front end panels on 485 networks
Through the RDM Data Manager.
Across an IP network. (Current controller IP address required)
Setup through front buttons
To enter setup mode, hold the Enter and Down
buttons together for approximately 3 seconds until
the message “Ent” appears on the display. Now
press the Enter button again to enter the function
menu. IO will be displayed. Scroll up or down to go
through the list.
ENTER
UP
DOWN
DEFROST
