Holding Current; Stepper Valve Type; Valve Wiring; Valve State - Overdriving - Resource Data Management PR0712-EPR Installation & User Manual

Mercury 2 & Intuitive Mercury EPR Stepper Installation Guide

Holding Current

If using a type of valve that requires a holding current you must select "Other" at P-30 and make sure parameters P-31, P-32, P-33, P-34
and P35 are all set to the correct values.
An example of this is the Carel E
"Step Max", "Step Close", "Step speed" and "mA Peak" it must be set to "Other" at P-30 for the holding current to operate correctly.
Warning: Not all valves require a holding current and applying a holding current to valves that do not require one could result in damage
to the valve and/or controller.
Refer to Manufacturers Data Sheet for information on holding current.

Stepper Valve Type

Parameters P-31, P-32, P-33, P-34 and P-35 only have an effect if "Other" is selected when configuring parameter P-30. Other allows the
user to map in the requirements the stepper valve.
Selecting option 0, 1, 2 or 3 at parameter P-30 sets the controller for use with the factory set values for the type of valve selected. The
controller will override any values set in parameters P-31, P-32, P-33 and P-35. Note the parameters relating to the Stepper Valve type
should be configured prior to wiring the Stepper Valve to the Mercury 2 Stepper controller. If one of the three default valve types is selected
then changing P-31, P-32, P-33, P-34 and P-35 will have no effect.
Manufacturer
Carel
Sporlan 1
Sporlan 2
Alco
Sporlan (other)
Sporlan (other)
See Appendix 3 Step Speed

Valve Wiring

Manufacturer
Carel
Sporlan
Alco
Important – Our information is taken from 3
incorporated in our document.
Review the manufacturer's datasheet for the selected valve before installation. If you are unsure regarding any of the above steps please
contact RDM Technical Support for further assistance.
Valve State – Overdriving
Each time the Mercury 2 EPR is powered on the control valve state has to initialise as the controller will have no knowledge of the current
valve opening position for the stepper motor attached. During this process the controller will close the valve by a number of steps greater
than the total number of steps for the valve configured. This is achieved using the Step Close parameter and is referred to as "overdriving"
the valve. This process will synchronize the controller with the stepper valve output. This ensures the stepper valve is at the 0 steps position,
fully closed and the control algorithm will use this for future control operations.
In certain applications there is a necessity to overdrive the Stepper motor periodically. If during normal operation the valve closes to 0% then
at this point the valve will be overdriven. If the valve doesn't close to 0% during normal operation then the valve will be overdriven during
each scheduled defrost. An additional feature is incorporated into the control algorithm, software V1.3 and above, which will overdrive the
Stepper motor output should the valve not close to 0% in an 8 hour period.
Please consult the stepper valve manufacturer's data sheet to obtain the number of steps required to overdrive the valve.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
Please Note
2
V valve which requires a holding current, although it is a Carel valve and has the same settings for
Model
3
E V
SER B/C/D
SER 1.5 to 20
EX4/5/6
CDS 4/7
CDS 9/16/17
also.
Model Wiring (Colours)
3
E V Yellow
White
Green
Brown
SER 1.5 - 20 Green
SER B/C/D
Red
SEI 6
White
CDS 4/7/9/16/17
Black
EX4/EX5/EX6 White (A)
Black (B)
Blue (C)
Brown (D)
rd
party data sheets at the time our document is created, any changes since will not be
Step Max Step Close
480 500
2500 3500
1596 1756
750 825
2500 3500
6386 6800
Connection Description (See Stepper Output)
M1B
M1A
M2A
M2B
M1B
M1A
M2A
M2B
M1A
M1B
M2A
M2B
Revision 1.2a
Step Speed (Hz)* mA Peak
50 450
200 160
200 160
500 500
200 147
200 215
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