MicroE 1500S Mercury - Manual (Page 15)

Page 13
Grounding of M1500S
For Mercury 1500S encoder systems to operate reliably, it is essential that the sensor and cable shield are grounded properly according
to the following instructions. The diagrams below show how to make the connections when the encoder's connector is plugged into the
customer's controller chassis. If a customer-supplied extension cable is used, it should be a double shielded cable with conductive
connector shells and must provide complete shielding over the conductors contained within it over its entire length. Furthermore, the
shields should be grounded at the connection to the controller chassis the same way as the encoder connectors in the diagrams below.
Note: For best performance, isolate the encoder outer shield from motor cable shields and separate the encoder cable as far possible from motor cables.
Grounding Instructions for Mercury 1500S Encoder System
Sensor mounted with good electrical contact to a well-grounded surface (preferred)
1. 15-pin D-sub connector grounding: The encoder's connector shell must be in intimate, electrically conductive contact with the customer-
supplied mating connector, which must be isolated from the controller's ground. If a customer-supplied shielded cable connects the encoder
to the controller, then the outer shield on the customer-supplied cable must be isolated from the controller's ground.
2. The sensor mounting surface must have a low impedance (DC/AC) connection to ground. The encoder sensor mounting surface may have
to be masked during painting or anodizing to insure good electrical contact with the sensor.
Sensor mounted to a surface that is grounded through bearings or a poorly-grounded surface, or mounted to a non-conducting surface
1. 15-pin D-sub connector grounding: The encoder's connector shell must be in intimate, electrically conductive contact with the customer-supplied
mating connector, which must be connected to the controller's ground. If a customer-supplied shielded cable connects the encoder to the controller,
then the outer shield on the customer-supplied cable must be connected to the controller's ground. The controller must be grounded to earth at the
point of installation.
2. The encoder sensor must be mounted so that it is electrically isolated from ground.
Mercury encoders require a minimum of 4.75V DC continuously. When designing circuits and extension cables to use Mercury encoders, be sure to
account for voltage loss over distance and tolerances from the nominal supply voltage so that at least 4.75V DC is available to the Mercury
encoder under all operating conditions. Do not exceed 5.25V DC.
Recommendations for Power
Outer Shield: Connected to sensor
and connector housing
Inner shield: Insulated from outer shield,
sensor case, and connector housing.
Connected to circuit common internally as
supplied by MicroE Systems
5 Volts
0 Volts
Power
Supply
5 Volts
0 Volts
Power
Supply
Do not ground
shroud
Electrically conductive
mechanical connection
as supplied by MicroE Systems