Remote Setpoint; Introduction; Procedure - Siemens LMV5 Series Technical Instructions

Technical Instructions
Document No. LV5-8000

Remote Setpoint

Introduction

The LMV5 can be configured to accept either a local setpoint or a remote setpoint. A remote
setpoint takes an analog input and converts it into a setpoint. On the LMV5, terminal X62 can
be wired and configured to accept a variety of signals for a remote setpoint. The following
steps describe the procedure for setting up a remote setpoint on the LMV5.

Procedure

1. Log in to the LMV5 with either the service or OEM level password.
2. The LMV5 must be set for a load controller operating mode of "IntLC X62". The LMV5
will utilize the internal PID loop, but will also respond to a remote setpoint from an
analog signal on terminal X62. To set the load controller operating mode to "IntLC X62",
use the following menu path:
Params & Display > LoadController > Configuration > LC_OptgMode = IntLC X62
3. Configure the type of analog signal which will be input to terminal X62. Four options are
available: 0-10 Vdc, 2-10 Vdc, 0-20 mA, or 4-20 mA. Use the following menu path to set
the input type for terminal X62:
Params & Display > LoadController > Configuration > Ext Inp X62 U/I
NOTE: For the remainder of this section, all examples will use a 4-20 mA signal.
4. The analog input must be scaled appropriately depending on the desired setpoint limits
for the remote setpoint. The LMV5 predefines what setpoint a 4 mA signal indicates.
Conversely, the LMV5 must be programmed with the desired setpoint for a 20 mA
signal. Then, the setpoint will be scaled linearly for any signal between 4 and 20 mA.
Low Setpoint Scaling
When operating on pressure, a 4 mA signal always translates to a 0 psi setpoint.
When operating on temperature, a 4 mA signal always translates to a 32°F setpoint.
High Setpoint Scaling
The high end of the setpoint scaling depends on the sensor type wired to terminals X60
or X61. There are three possibilities for sensor type: a pressure sensor wired to
terminal X61, a temperature sensor wired to terminal X60, or a temperature transmitter
wired to terminal X61.
Appendix A Page 30
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