Continental Hydraulics Installation Manual
Page 11 of 15
CEM-MS-A
CHI 1013478 Jan 2013
Command input with Current:
The analog position and feedback inputs may be software set to accept a current command.
Either input can be individually adjusted to accept either voltage or current. When current is
chosen, a 250 ohm resistor is internally inserted across terminals 13 and 11, and/or between
terminals 14 and 11. This resistor converts the current to a voltage. This voltage is measured by
the amplifier to become the system command (13/11) or the system feedback (14/11) and (6/11).
Input current range is 0 to +20 mA, and is typically used at 4 to 20mA. This current is converted
to voltage, and software scale and offset parameters are applied to meet system requirements.
13
11
+24v
3
4
Power Supply
Gnd
Line
AC
DC
(Gnd)
4 to 20mA
Transmitter
A
Line
AC
DC
Loop Monitor
(optional)
Power Supply
When using current as a command or feedback signal that is connected to more than one
module, only one module may use a resistor to convert the current to voltage. All modules must
have parameter scale and offset adjustments for current feedback.
14
11
+24v
3
4
Power Supply
Gnd
Line
AC
DC
(Gnd)
4 to 20mA
Position
Transmitter
A
Line
AC
DC
Loop Monitor
(optional)
Power Supply
6
11
+24v
3
4
Power Supply
Gnd
AC
DC
(Gnd)
CEM-MS
"Master"
CEM-MS
"Slave"
Software Parameter adjustment:
(Master) AIN:K 1250 1000 2000 C
(Slave) AIN:X 1250 1000 2000 V
Line
All analog input signal cables must be shielded!
Good analog system design requires that all analog signals in an electrically noisy environment
be shielded. Long wires act like antennas that pick up analog noise. The wire connecting the
analog command source to command this module must be shielded! An unshielded cable can
allow electrical noise to be added to the desired command signal, and can make the system
response erratic.
Shielding a noise sensitive wire is accomplished by wrapping a noise blocking foil or braided
shield around the signal wire. This shield must be grounded at only one end, usually the end that
sends the signal. A control cable may have many individual conductors. The conductors may be
shielded individually, or may be shielded as a group. Short signal wires in electrically quiet
environments may not need to be shielded.
The CEM family of modules all have an internal ground connection to the DIN rail. For this
module ground to be effective, please insure the DIN rail is properly grounded.
