Open Interlock The input contact to the Open Interlock is monitored. Whenever the
input contact is closed this bit will be true (1). If the actuator is not
using the interlock function, then this input can be used as a digital
status feedback for a plant signal not associated with the actuator. If
the interlock circuit is being used, then permission must be granted
before the actuator can be opened. The presence of this bit will
indicate that opening is permitted and permission is granted.
Close Interlock The input contact to the Close Interlock is monitored. Whenever the
input contact is closed this bit will be true (1). If the actuator is not
using the interlock function then this input can be used as a digital
status feedback for a plant signal not associated with the actuator. If
the interlock circuit is being used, then permission must be granted
before the actuator can be closed. The presence of this bit will
indicate that closing is permitted and permission is granted.
Position Control Enabled
This bit will be true (1) when a Position command is being actioned.
This data can be used to indicate that positioning mode has control of
the actuator.
Thermostat If the temperature of the motor windings rises above the thermostat
trip value, the thermostat contact will open and this signal will be
present (1). There are no adjustments for the temperature at which
the thermostat trip operates. The motor will be stopped if the
thermostat trips. Only once the motor (or transformer) has cooled
down and the thermostat has reset itself can a new Remote, Host or
Local command to move the actuator be carried out. A setting on the
actuator main board allows the ESD command to override the
thermostat. The bit will remain set at logic 1 until the thermostat resets
itself.
Monitor Relay This signal is true (1) when actuator remote control is not available.
The actuator Monitor Relay status is a composite signal for several
alarms. This signal will be set true if the actuator selector is in Local or
Local Stop (not in Remote) or if the thermostat trips.
Note on an IQ3/IQT3 actuator the Monitor Relay can be set to
trigger on “Available” or “Alarm”. When set to Alarm, Local or
Local Stop won’t cause a monitor Relay Alarm – see section 2.2
of PUB002-040: http://www.rotork.com/master-popup/8953/
The mains supply is always monitored and if one of the three phases
is lost, this bit is set. If the actuator is operated from a single phase
supply and this is lost, then communications with the actuator will also
be lost. Where a 3-phase supply is used, if the phase associated with
the control circuits is lost then communications with the actuator will
be lost.
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