Installation guide

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
Revision 2.7 Page 4 of 83
Mercury Plant Controller Installation Guide
The Mercury Range
From Resource Data Management
This documentation refers to the controller Mercury Plant Controller
Description
The Mercury Plant Controller is a versatile controller intended for Pack and/or Condenser control. It has 12 relay
outputs that are configurable for compressors, loaders, trim compressors or fans. The 12 digital inputs can be
assigned for Pack or Condenser section inputs or general alarms. There are three inputs for pressure transducers
(either can be set to 4-20mA, 0-5Vdc or 0-10Vdc); 2 for control purposes and 1 monitor. The Pressure readings
obtained from the three inputs can be broadcast over a Data Manager IP network for use by RDM Mercury Switch
(PR0018-PHI). There are 8 temperature probe inputs. The controller has 2 analogue outputs to control variable
speed devices (either can be set to 0-5V dc, 0-10V dc, 4-20mA or 0-20mA).
The controller has 10 software type options, see table below.
The "Fuzzy" based algorithm, will give enhanced control whilst maintaining the starts/hr requirement. The algorithm
also reduces the number of input parameters required for control; only a target pressure is needed.
The “staged” type allows the user to fully program the output stages to the desired elements.
The Mercury Plant controller has an embedded Ethernet port to allow for connection to a Data Manager system
without the need for a communications module. A USB port allows for a direct PC connection.
All relays are volt-free and can be mixed between low and high voltage sources. The controller requires a 24Vac or
24Vdc PSU (Vdc PSU available from RDM: - PR0625)
Configuration
The controller has ten configuration options: -
Types
Display value
Type
Control Type
1
Pack
Fuzzy
2
Dual Pack
Fuzzy
3
Pack/Condenser
Fuzzy
4
Dual Condenser
Fuzzy
5
Condenser
Fuzzy
6
Pack
Staged
7
Dual Pack
Staged
8
Pack/Condenser
Staged
9
Dual Condenser
Staged
10
Condenser
Staged
The controller is delivered pre-configured as a Pack Controller (Type 1) See Type Change
A PC program is available to pre-configure the Pack controller for downloading into the Plant hardware. Contact
RDM for further details.
See Set-up to change the controller type.