2-1
2.SPECIFICATIONS
The Hawk-I is an expandable-platform digital controller with many
available options that allow the user to select a powerful yet economical
control system.
2.1 Inputs
The sixteen discrete digital inputs used in the Hawk-I have volt-free contacts
and are non-incendive; any kind of input switching device can be used. There
is not enough energy in the circuit to ignite any gas mixture that may be
present. The minimum loop resistance for an ‘off’ state is 15kΩ, the scan rate
is 100 msec, and the response time is 100 msec.
The Hawk-I provides a speed input designed for use with an AMOT
magnetic pickup, which senses gear teeth to determine RPM.
The optional J and/or K-type thermocouple inputs may be used with an
expanded Hawk-I system. The available temperature range is -346º to 1940º
F, or -210º to 1060º C. Accuracy is better than 1% of FSD with a 100 ms
scan rate. The thermocouple input field connections are classified as non-
incendive, since a thermocouple is a simple device that cannot store energy.
The field wiring is 37-Way D Type through a DB-37 connector.
The Hawk-I can provide optional 4-20 mA/two-wire analog inputs. These
inputs have an accuracy of ±0.5% of indicated parameter value with a scan
rate of 100 ms. Loop power of 15 Vdc (open circuit) is provided. These
analog inputs are designed for use with transmitters that are approved for use
in a Class I, Division 2 area and are non-incendive. The field wiring is 25-
Way D Type through a DB-25 connector. For hazardous area installations, if
non-approved end devices are used, wiring must pass through an approved
barrier.
2.2 Outputs
The basic Hawk-I system has four relay outputs. The outputs are solid-
state (non-sparking) relays rated at 36Vdc, 1.75A. An external snubber
network is required when switching inductive loads. These outputs are
accessed through two-part Phoenix connectors on the back of the Hawk-I
module. The connectors can accept wire as large as 12 AWG, allowing
long wire runs without excessive signal loss.
2-2
WARNING
SINCE THESE RELAYCIRCUITSTRANSMIT POWER FROM
AUXILIARYEQUIPMENT, THEYARE CLASSED
INCENDIVE. ALL ASSOCIATED WIRING MUST BE
SEPARATED FROM NON-INCENDIVE WIRING BYAN
APPROPRIATE DISTANCE.
A further option allows for eight low power, solid state relays. These
outputs are rated at 100 mA/36 V. Connections are made through a 9-
way, D type connector. One side of the relays is bussed common.
Two optional analog outputs can also be provided. These 4-20 mA
outputs can be used to transmit selected data to a remote receiver. The
accuracy is better than 0.75% of FSD with an update rate of 100 msec.
These analog outputs are designed to be attached to a 4-20mA receiver
that has been approved or recognized for use in a Class I, Division 2 area.
If a non-approved receiver is used, the analog output wiring must pass
through an approved barrier, when used in a hazardous area.
2.3 Communications
In addition to the I/O options, the Hawk-I has a 9-pin RS232C connec-
tor that can be used to connect the Hawk-I system with a modem, DCS,
or a PC for programming and configuration changes. The protocol is
Modbus/RTU. This additional programming capability is further
discussed in a separate AMOT manual that describes the HawkWin
computer program.
Signal levels on the RS232C port may be incendive. Any attached device
within a hazardous area must be approved or recognized for use within
that area.
2.4 Display
The Hawk-I controller has a large, high-contrast, backlit, 32-character
display on a NEMA 4 faceplate. This LCD is 16 character by 2-line.
System faults are identified in plain English, and display messages can be
configured into the Hawk-I unit by the user.
2.5 Environment
The Hawk-I is suitable for use only in Class I, Division 2, Groups A, B,
C and D, or non-hazardous locations. Wiring should be installed by
qualified personnel in compliance with local electrical codes.
