RTK Series UC625 Annunciator
13
Inputs & Outputs
Customer Connections
All connections to the alarm board inputs and outputs are made via quick disconnect, rising clamp, two
part plug-able connectors.
Annunciator Inputs
The standard Series UC625 Annunciator operates from either a normally open or normally closed
contact. Standard systems use an internally generated 24VDC as the signal supply voltage however
options exist, if specified at the time of order, to allow the user to use direct powered inputs:-
NOMINAL VOLTAGE
MIN V
MAX V
24VAC/DC
13
100
48VAC/DC
24
120
110VAC/DC
56
220
250VAC/DC
120
400
Please note:- The above min & max voltages are typical values in reality the inputs are designed to
withstand substantially higher voltages for prolonged periods under fault conditions.
As field contacts are often great distances from the annunciator it is advisable to run the contact
cables separately from circuits carrying heavy currents and/or high voltages so as to minimise the
effects of induced voltages. A transient filter is built into the input circuitry so that low voltage
interference will be ignored. Contacts may be continuous or fleeting, the annunciator can be selected
to lock-in fleeting alarms if required.
Optically Coupled Inputs
All inputs from alarm contacts and external pushbuttons are optically coupled. This method of
operation improves the system's tolerance to noise interference and allows operation from voltage
sources as standard.
Signal Duplicating Relays
Integrally mounted signal duplicating relays are provided per channel. The standard mode of operation
for the duplicating repeat relays is to activate when an alarm condition occurs and return to normal
when the plant fault has returned to normal. (Contact-Follower). Each pair of signal duplicating relays
can be set to operate as either normally de-energised or normally energised relays and the associated
contact can be selected as normally open or normally closed.
Response Time
Each channel within the annunciator can have a pre-defined min response time set to one of the
following times:- 5ms, 25ms, 50ms and 100ms using DIL switches mounted on each alarm card.
Unless otherwise requested at the time of order units are shipped with a factory setting of 25ms but
can be easily changed to 5mS, 50mS or 100mS as described later in the manual.
If the UC625 is supplied with a suffix M3 or M4 in the model number the response times will be 5mS,
25mS, 200mS or 5S as described later in the manual
