Emerson AMS Installation Guide

DANGER
The KL4502X1-MA1 CHARM Relay Output Terminal Block may have hazardous live
voltages on its output terminals. This terminal block is capable to switch field power of 250
V AC. Ensure that proper safety precautions, such as de-energizing field power, are
observed during installation, maintenance, or any time wiring changes are made to the
CHARM Relay Output Terminal Block.
Permissible relay contact ratings:
• 28.8 VDC at 5 A switching current
• 48 VDC at 0.4 A switching current
• 250 VAC at 5 A switching current
See the documentation provided with the CHARM Relay Output Terminal Block for further
details and technical data.
Procedure
1. At opened door, lead the signal cable through a cable gland close to the slot where
the CHARM to be connected is installed.
2. Strip the cable sheath at a length of approximately 200 mm.
3. Strip each wire at a length of approximately 10 mm.
4. Connect the wires to the CHARM Relay Output Terminal Block.
5. Ensure that the cable gland, where the signal cable is led through, is closed to keep
the IP protection class of the AMS Asset Monitor.
6. Continue with the installation or close the door (see Close the AMS Asset Monitor).
5.6 Install a DI 24 V DC Low-Side Sens CHARM
The DI 24 V DC Low-Side Sens CHARM is a discrete input CHARM for sensing relay and
switch contact closure. The CHARM is supplied by the AMS Asset Monitor. A CHARM
Terminal Block is required for the installation. See Installing CHARMs hardware for the
general CHARM installation procedure.
This CHARM supports line fault detection for detecting open or short circuits in the field
wiring when external line fault resistors are used. To use line fault detection:
• Enable line fault detection in the CHARM's configuration.
• Connect the dry contact to a 12 kΩ resistor in parallel for open circuit detection and a
2.4 kΩ resistor in series for short circuit detection. See Figure 5-14 for a connection
diagram.
Note
Connect the resistors as closely as possible to the signal input to ensure proper line
fault detection.
Installation Guide Installing CHARMs hardware
MHM-97923-PBF March 2024
MHM-97923-PBF, Rev. 2.10 57

Emerson AMS Specifications

General

Output	4-20 mA, Digital
Measurement Type	Vibration, Temperature
Communication Protocol	Modbus, WirelessHART
Operating Temperature Range	-40°C to +85°C
Enclosure Rating	IP66
Power Supply	Battery, External Power