AMALGAMATED INSTRUMENT RM4-IV, Operation And Instruction Manual

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1 Introduction
1.1 General description
This manual contains information for the installation and operation of the RM4-IV DIN rail moni-
tor/controller. The RM4 is a general purpose instrument which may be configured to accept inputs
of
±
2mA,
±
20mA, 4 to 20mA,
±
100mV,
±
1V,
±
10V,
±
100VDC or 3 wire slidewire (1kΩ slidewire
to 1MΩ slidewire values).
Two separate sets of calibration scaling values can be stored with the display choice being made
via a remote switch. The RM4-IV offers the choice of linear or square root display.
The instrument may be calibrated to display the input in engineering units. Two standard inbuilt
relays provide alarm or PI control functions. A standard transmitter supply of 24VDC @ 25mA
unregulated is also provided on both AC and DC powered models.
Alarm relays and optional retransmission may be set to operate from the live input value, the
display value or to follow either the tare, peak hold, display hold, peak memory or valley memory
remote input operations.
Unless otherwise specified at the time of order, your RM4 has been factory set to a standard
configuration. Like all other RM4 series instruments the configuration and calibration is easily
changed by the user. Initial changes may require dismantling the instrument to alter PCB links,
other changes are made by push button functions.
Full electrical isolation between power supply, input voltage or current and optional retransmission
output is provided by the RM4, thereby eliminating grounding and common voltage problems.
This isolation feature makes the RM4 ideal for interfacing to computers, PLCs and other data
acquisition devices.
The RM4 series of DIN Rail Process Modules are designed for high reliability in industrial appli-
cations. The 5 digit LED display provides good visibility, even in areas with high ambient light
levels. A feature of the RM4-IV is the programmable display brightness function, this allows the
unit to be operated with low display brightness to reduce the instrument power consumption and
to improve readability in darker areas. To reduce power consumption in normal use the display
can be programmed to automatically dim or blank after a set time, the display will return to its
normal brightness level if any of the pushbuttons are pressed or if an alarm relay is activated.
1.2 Standard outputs
•
Two standard inbuilt relays provides an alarm/control function
(can be set for on/off alarm/control or PI control using pulse width or frequency control)
•
A non isolated transmitter supply of approx. 24VDC (25mA max.) unregulated is provided.
1.3 Output options
•
1 or 2 extra relays (not configurable for PI control)
•
Dual output transistor switched 24VDC (non isolated).
•
Isolated 12 bit analog retransmission (single or dual analog output versions available) config-
urable for 4–20mA., 0–1V or 0–10V. The first analog output is configurable for retransmission
or PI control.
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