Koso REXA Electraulic Xpac, Installation And Operation Manual

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REXA
Electraulic Actuators & Drives
Xpac
Installation Manual -- Version 5.1 (5/09)
C-3
C OPTIONAL FEATURES
To complement the standard capabilities found in the Xpac,
various options are available to fulfill specific applications.
C.1 Position Transmitter
The position transmitter provides a two-wire 4-20 mA signal
that is proportional to actuator position. The transmitter’s
output is optically isolated from the electronics. Both an active
and passive transmitter are available. The passive transmit-
ter is similar to other two-wire devices in that an external DC
power source is required.
If Rexa has supplied an active transmitter, then a 24vdc power
supply has been installed in the control enclosure. The supply
voltage indicated on the interconnect diagrams is not required.
Maximum external resistor load is 700 ohms.
Also included in the transmitter is an Alarm Relay which may be used
in series with the 4-20 mA signal loop or as an independent alarm
circuit. The Alarm Relay will change state (de-energize) anytime the
actuator is unable to follow the applied control signal.
SPECIFICATIONS
Transmitter:
Accuracy:
Linear <0.25% of full stroke
Rotary <0.25% of 90½ rotation
Resolution: <0.1% of full stroke or 90° rotation
Maximum External Load: 1000 ohms
Power Requirements:
Minimum Supply Voltage = 10 vdc + (.02 x external
load resistor)
Maximum Supply Voltage = 36 vdc + (.004 x external
load resistor)
Maximum external load resistor @ nominal 24 vdc =
700 ohms
Alarm Relay:
Response: ½ second of any “fail to operate condition”
Alarm Contacts: SPDT
Rating: 1 amp @ 30 vdc, 0.3 amp @ 120 vac - resistive
See section C.4 for details concerning
the alarm relay.
This passive transmitter can be field
retrofitted in less than one-half hour.