Eaton Crouse-hinds series User manual

RTK UC625
Compact alarm annunciator
September 2016
INM UC625 rev 24
Instruction manual
MTL process alarm equipment

ii INM UC625 rev 24
DECLARATION OF CONFORMITY
A printed version of the Declaration of Conformity has been provided separately within the original
shipment of goods. However, you can find a copy of the latest version at
http://www.mtl-inst.com/certificates
GENERAL SAFETY INFORMATION
The following methods are used in this manual to alert the user to important information:-
WARNING !
Warnings are provided to ensure operator safety and MUST be followed.
CAUTION
Cautions are provided to prevent damage to the instrument.
NOTE
These are used to give general information to ensure correct operation.

INM UC625 rev 24 iii
CONTENTS
DECLARATION OF CONFORMITY ......................................................II
GENERAL SAFETY INFORMATION.....................................................II
1 INTRODUCTION ....................................................................1
2 INTRODUCTION ....................................................................1
3 MODEL NUMBER DESCRIPTION ......................................................2
4 SYSTEM DESCRIPTION AND FEATURES ...............................................3
4.1 General ..................................................................................3
4.2 Alarm Card ...............................................................................3
4.3 Reliable Annunciation ......................................................................3
4.4 Supply/Pushbutton/Relay Card (SPR) ..........................................................3
4.5 Power Failure Monitoring ...................................................................3
4.6 Serviceability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4.7 No Special ServiceTools Required ............................................................4
5 INPUTS & OUTPUTS ................................................................5
5.1 Customer Connections......................................................................5
5.2 Annunciator Inputs.........................................................................5
5.3 Optically Coupled Inputs ....................................................................5
5.4 Signal Duplicating Relays ...................................................................5
5.5 Response Time ............................................................................6
5.6 Common Alarm Group Relay [GP] ............................................................6
5.7 Reflash Function ...........................................................................6
5.8 Dual Audible Alarm Feature .................................................................6
5.9 Dual Horn Relays [HNA-HNB] ................................................................6
5.10 Dual Power Monitoring Relays ...............................................................6
6 MECHANICAL DETAILS ..............................................................7
6.1 Alarm Card ...............................................................................7
6.2 SPR Card – Supply / Pushbutton/Relay ........................................................7
6.3 System Assembly ..........................................................................7
6.4 UC625 Dimensions.........................................................................7
7 SEQUENCES .......................................................................8
7.1 Summary.................................................................................8
7.2 First-up Sequences.........................................................................8
7.3 Automatic Reset ...........................................................................8
7.4 Non-latch Sequence (No lock-in) .............................................................8
7.5 Reflash Feature ............................................................................9
7.6 Ringback Sequence ........................................................................9
7.7 Two Pushbutton Operation ..................................................................9
7.8 Status Only Operation ......................................................................9
7.9 Option M4 ................................................................................9
7.10 Sequence Configuration and Tables ..........................................................10
7.10.1 Manual Reset ISA-Sequence M ..........................................................10
7.10.2 Automatic Reset ISA-Sequence A.........................................................10
7.10.3 Non Lock-in Function ISA-A-4 Sequence...................................................11
7.10.4 Ringback ISA-R Sequence...............................................................11
7.10.5 Automatic Reset First-up ISA-F1A Sequence ...............................................11
7.10.6 Manual Reset First-up ISA-F2M-1 Sequence ................................................12
7.10.7 Status Only ISA-A-4-5-6 Sequence ........................................................12

iv INM UC625 rev 24
8 FEATURES........................................................................13
8.1 Input Configuration .......................................................................13
8.1.1 Signal Duplicating Relays ...............................................................13
8.1.2 Repeat Relay Mode Of Operation .........................................................14
8.1.3 Input Follower ........................................................................14
8.1.4 Logic Follower ........................................................................14
8.1.5 Operation of Repeat Relays DuringTest....................................................14
8.1.6 System Test ...........................................................................14
8.1.7 Disable Horn On SystemTest Option “DHT” (Model Suffix Code M1) ...........................14
8.1.8 LED Indication ........................................................................14
8.1.9 Dual Audibles And Dual Horn Relays......................................................15
8.1.10 Integral Horn Disable...................................................................15
8.1.11 Auto-Acknowledge Feature..............................................................15
8.1.12 Common Alarm Relay ..................................................................16
8.1.13 Reflash Option ........................................................................16
8.1.14 Input Follower ........................................................................17
8.1.15 Logic Follower ........................................................................17
8.1.16 Sleep Mode...........................................................................17
9 SPECIFICATION....................................................................18
9.1 Optically Coupled Inputs ...................................................................18
9.2 Outputs .................................................................................19
9.3 Pushbuttons .............................................................................19
9.4 General .................................................................................20
10 INSTALLATION ....................................................................21
10.1 Cut-out dimensions .......................................................................21
10.2 Cabinet Fixing............................................................................22
10.3 Channel Numbering.......................................................................22
10.4 Connection Details ........................................................................23
10.5 Power Connections .......................................................................25
10.6 Aux Supply Option ........................................................................25
10.7 Signal Supply ............................................................................26
10.7.1 Signal Supply Monitor Relay ............................................................26
10.7.2 Signal Supply Options..................................................................26
10.7.3 Earthing..............................................................................26
10.7.4 Remote Pushbutton Connections .........................................................26
10.7.5 Standard Inputs Connections ............................................................28
10.7.6 Powered Inputs @ 24VDC ...............................................................29
10.7.7 Higher Voltage Powered Inputs...........................................................30
10.7.8 Sleep Mode...........................................................................31
11 SYSTEM DIL SWITCH LOCATION AND FUNCTIONS .....................................32
11.1 DIL Switch Functions On Alarm Cards ........................................................33
11.2 Identifying Card Types – UPTO NOV 2012 .....................................................34
11.3 Identifying Card Types – AFTER NOV 2012.....................................................35
11.4 Alarm Card Input Response Settings STANDARD VERSIONS – UPTO Nov 2012......................36
11.5 Alarm Card Input Response Settings M3 / M4 OPTION VERSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
11.6 Alarm Card Input Response Settings STANDARD VERSIONS – AFTER Nov 2012 .....................38
11.7 Alarm Card Input & Sequence Settings (Set In Pairs) – Pre Nov 2012 ..............................39
11.8 Alarm Card Relay And Horn Settings (Set In Pairs) .............................................40
11.9 Alarm Card Settings for CARDS SUPPLIED AFTER Nov 2012 .....................................41
11.10 Alarm Card Relay And Horn Settings (Set In Pairs) .............................................44
11. 11 DIL Switch Settings SPR Card45 .............................................................45
11.12 SPR Card Horn, Relay And Pushbutton Settings................................................46
11.13 Automatic Acknowledge Timer (Located On SPR Card) ..........................................47
11.14 Internal Horns Disable (Located On SPR Card) .................................................47

INM UC625 rev 24 v
12 MAINTENANCE ...................................................................48
12.1 No SpecialTools Required ..................................................................48
12.2 Legend Plate Removal .....................................................................48
12.3 Film Legend Engraving.....................................................................48
12.4 Alarm Card or SPR Card Removal. ...........................................................48
12.5 Super-Bright LED’s.........................................................................48
12.6 Fuse replacement .........................................................................49
13 EXPANSION UNITS ................................................................50
13.1 Master and Expansion UC625 Units..........................................................50
13.2 UC625 Master & Expansion Rear Terminal Views ...............................................51
14 OPTIONS .........................................................................53
14.1 Option 00 Horn Disable On System Test.......................................................53
14.2 Option 01 Lamp Test Instead of FunctionalTest .................................................53
14.3 Option 02 Ringback Horn Disabled...........................................................53
14.4 Option 03 ISA R12 Sequence................................................................53
14.5 Option 04 ResponseTimes .................................................................53
14.6 Option 05 Lamp / Audible Test...............................................................53
14.7 Multiple Option Codes .....................................................................53
15 TROUBLE SHOOTING GUIDE .....................................................54-57
16 OTHER MTL PROCESS ALARM EQUIPMENT PRODUCTS .................................58
17 SWITCH SETTINGS PER ALARM SEQUENCE ...........................................59

vi INM UC625 rev 24
Figures
Figure No. Description Page No.
1 Examples of a 20 and 12 way UC625 Alarm Annunciator viii
2Panel Fixing Arrangement 22
3 Channel Numbering 22
4 Typical Connection Details 23
5 Typical Connection Details (revised layout post January 1st 2008) 24
6 Power Connection Details (revised labelling post January 1st 2012) 25
7 Optional Remote Pushbutton Connections 27
8 Optional Remote Horn Connections 27
9 Standard Signal Input Connections 28
10 24VDC Powered Signal Input Connections 29
11 48/110/250 VAC/DC Powered Signal Input Connections 30
12 Connection for Sleep Mode 31
13 Alarm Card DIL Switch Location (ASIC version) 32
14 Alarm Card DIL Switch Location (FPGA version) 33
15 Alarm Card DIL Switch details (SW3 and SW5) 39
16 Alarm Card DIL Switch details (SW4 and SW6) 40
17 Alarm Card DIL Switch details (SW3 and SW5) 43
18 Alarm Card DIL Switch details (SW4 and SW6) 44
19 SPR (Supply, P/B’s and Relays) Card showing DIL switches 45
20 SPR Card DIL Switch details (SW5) 46
21 Signal Supply Fuse Location 49
22 Fuse Location For Systems Using AUX 24VDC Supply 49
23 UC625 Master Units with Ribbon Expansion Socket 51
24 UC625 Expansion Units with Ribbon Expansion Socket 52

INM UC625 rev 24 vii
Tables
Table No. Description Page No.
1 UC625 Dimensions 7
2 Manual Reset ISA-Sequence M 10
3 Automatic Reset ISA-Sequence A 10
4 Non Lock-in Function ISA-A-4 Sequence 11
5 Ringback ISA-R Sequence 11
6 Automatic Reset First-up ISA-F1A Sequence 11
7 Manual Reset First-up ISA-F2M-1 Sequence 12
8 Status Only ISA-A-4-5-6 Sequence 12
9 Input Configuration 13
10 De-Energised (Energise On Alarm) or Energised (De-Energised on Alarm) 13
11 Relay Contact Normally Open or Normally Closed (De-Energised Relay State) 13
12 Logic Follower 14
13 Operation of Repeat Relays During Test 14
14 Dual Audibles And Dual Horn Relays 15
15 Integral Horn Disable 15
16 Integral Horn Disable 15
17 Logic Follower. 15
18 Common Alarm Relay 16
19 The Common Alarm Relay Contact can be set to N/O or N/C as follows 16
20 Reflash Option 16
21 Logic Follower. 17
22 Cut-Out Dimensions 21
23 Power Connections 25
24 Aux Supply Option 25
25 Remote Pushbutton Connections Options 27
26 DIL Switch Functions On Alarm Cards 33
27 ASIC card versions (upto November 2012) 34
28 FPGA card versions (after November 2012) 35
29 Alarm Card Input Response Settings standard versions (upto Nov 2012) 36
30 Alarm Card Input Response Settings M3/M4 option versions 37
31 Alarm Card Input Response Settings standard versions (after Nov 2012) 38
32 Automatic Acknowledge Timer (Located On SPR Card) 47
33 Internal Horns Disable (Located On SPR Card) 47
34 SWITCH SETTINGS PER ALARM SEQUENCE 59

viii INM UC625 rev 24
INSTRUMENTS
TEST
MUTE
RESET
ACK
SUPPLY 1
SUPPLY 2
SUPPLY FAIL
AUX DC
SUPPLY FAIL
UC625
MAIN DC
UC625 RESET
ACK
MUTE
TEST
SUPPLY 2
SUPPLY 1
INSTRUMENTS
Figure 1 - Examples of a 20 and 12 way UC625 Alarm Annunciator

INM UC625 rev 24 1
725B range of Alarm Annunciator
1 INTRODUCTION
The RTK UC625 range of Alarm Annunciator systems are designed to give LED indication of
an alarm condition, where a high degree of reliability and flexibility is required.
Each system comprises a compact cabinet, removable legend plate, universal Alarm Cards
and a Supply/Pushbutton/Relay (SPR) Card which gives maximum annunciator density whilst
maintaining a practical legend area and neat front panel appearance.
DIL switches, situated on each of the Alarm Cards permit easy selection of annunciator
sequences as listed in the ISA Publication “Alarm Sequences and Specifications S18.1 –
1979 (R1985)”.
As the system is fully field-programmable on a per pair of alarm basis, the operating
specification, of both alarm sequence and function, can be changed during commissioning, or
at a later date after the equipment is installed. This means that stocking requirements may be
minimised, since all annunciator cards are interchangeable.
Reliability of operation is increased over conventional annunciators by the use of application
specific integrated circuits (ASIC’s), which are capable of complete system control. When the
annunciator is initially switched on, control is arbitrarily allocated to any one of the ASIC’s on
any of the Alarm Cards, hence the annunciator requires no control or master module, failure
of which could jeopardise the whole system.
If the Alarm Card is removed or an ASIC goes faulty then control is randomly allocated to
another ASIC on another Alarm Card, hence the worst fault that could normally occur is
the loss of one card. The use of ASIC’s also results in a very low component count, again
improving system reliability.
The UC625 features an integral, dual power supply capable of accepting a supply voltage from
either 88-265VAC OR 88-300VDC which allows the user to connect the unit directly to a main
and aux supply to provide redundant operation.
As an option, if specified at time of order, the second supply voltage can be manufactured to
allow direct operation from an Aux.24VDC Supply Voltage in the range 19 to 31VDC.
As standard an internally generated 24VDC is used as a signal supply voltage, which is used
for distribution to the associated field contacts. The 24VDC signal supply is designed to be
present if either the primary or secondary supply is available to ensure 100% redundancy.
NOTE
When using the direct powered input options the signal supply voltage is derived from
outside the unit, by others, and redundancy is therefore dependent on the signal supply
voltage being available at all times.
On systems supplied after January 1st 2008 the signal supply voltage is provided with a
monitor relay.
Two alarm channels are dedicated to monitor the dual supply Inputs and alert the operator if
there is a loss or failure of either.
Accessibility for servicing is excellent, being accomplished from the front of the panel with
only a screwdriver required to access the alarm or Supply / Pushbutton / Relay card.

2INM UC625 rev 24
MODEL NUMBER DESCRIPTION
UC625 = Model no prefix
** = Number of available alarm channels [Not including the 2 power failure alarms]
** = LED colour RD = Red (Standard)
H = Input supply 1 universal (88-300VDC or 88-265VAC)
** = Input supply 2 specify option H or L
024D = 24VDC signal supply voltage OR
Options for 48/110/250VAC/DC signal supply inputs
R = Individual channel signal duplicating relays fitted
MODEL NO. OF
ALARMS
LED
COLOUR
SUPPLY 1 **SUPPLY 2 SIGNAL
SUPPLY
REPEAT
RELAYS
UC625
12
RD = Red
YL = Yellow
AM = Amber
GN = Green
WH = White
IN = Intermixed
H = Universal
88 to 265VAC
or
88 to 300VDC
Optional
L = 24VDC
OR
H = Universal
88 to 265 VAC
or
88 to 300 VDC
Standard
R = Repeat
Relay
Option
Fitted
16 024D = 24VDC
20
Optional
Externally
Powered Inputs
24
28
32 048 = 48VAC/DC
36 110 = 110VAC/DC
40 250 = 250VAC/DC
Typical Model No.
UC625 40 RD H H
024D R = M*
M* Option code see below
PLEASE NOTE:- If more than 40 ways are required as a single system expansion UC625 units can
be connected via the expansion ribbon bus connector as detailed later in the manual on all units
shipped after August 2004
Option Codes
These Codes are added as a suffix to the Model No and MUST be specified at the time of ordering.
M1 = Horn disabled on System Test
M2 = Modified Ringback sequence, disabled ring back audible and lamp test in place of
system test.
M3 = ISA R12 Ringback sequence, disabled Ringback horn, lamp test in place of
system test and response time changed to 5mS trip 5S pre-alarm.
M4 = ISA R12 Ringback sequence, disabled ring back audible, lamp test in place of
system test, response time changed to 5mS trip and 5S pre-alarm and combined
Lamp / Audible Test pushbutton function.

INM UC625 rev 24 3
2 SYSTEM DESCRIPTION AND FEATURES
2.1 General
The units can be manufactured in a range of sizes to suit individual applications. All units are
designed to be 4 alarm ways high but the number of windows wide is variable. This allows
RTK to provide systems suitable for 12, 16, 20, 24, 28, 32, 36 or 40 channels and all units are
provided with two additional channels used for monitoring the two integral supplies, Supply 1
and Supply 2
The annunciators are built up using variable size top / bottom plates, universal side plates to
give a basic panel mounting framework, a rear mounting motherboard and removable Legend
Plate. The universal Alarm Cards are of the plug in type and are easily accessed once the front
legend plate has been removed. The Alarm Cards simply plug into the motherboard, which
also houses the terminals for external connection by the customer. A removable legend
plate is fitted over the front of the alarm boards containing film legends, which identify the
individual alarm channels.
2.2 Alarm Card
Each active Alarm Card controls four alarm points. The Alarm Card has an Application Specific
Integrated Circuit (ASIC), which controls the alarm ways. System control is arbitrarily allocated
to one of the ASIC’s on any one of the Alarm Cards, obviating the need for a master control
module. Each Alarm Card is fitted with DIL switches, which are used to select the required
features for each pair of alarms.
2.3 Reliable Annunciation
The fact that all the cards are identical means that in the RTK range of UC625 alarm systems
there is no master or controlling card, failure of which could jeopardise the whole system.
System control is arbitrarily allocated to any one of the alarm modules. Should this card
be removed, damaged or fail for any reason, another card will take over system control.
This method of operation results in a system with no single source of failure and multiple
redundancies giving the most reliable form of annunciation possible.
2.4 Supply/Pushbutton/Relay Card (SPR)
This card is fitted in the right hand side of the annunciator and has 4 pushbuttons to cover
all system functions and two “power on” LED’s. The four pushbuttons are:- System Test,
Acknowledge, Mute and Reset. The two green LED’s are used to indicate “Power On” for
Supply 1 (main) and Supply 2 (aux.).
2.5 Power Failure Monitoring
The SPR Card is fitted with two power failure alarms, which are used to monitor Supply 1 and
Supply 2 and provide full alarm capability when either supply is not present on the unit.
The two supply inputs provide FULL redundancy of operation so that failure of a single supply
input will have no affect on the overall operation of the unit.
The standard version which uses an internally generated 24VDC Signal Supply to provide a
feed to the field contacts.
Powered input versions rely on the customer generated signal supply being available at all
times.
The Power Failure alarm channels are fixed at alarm sequence ISA-M and are therefore
controlled by System Test, Acknowledge and Reset Pushbutton inputs to allow full control
over the alarms.

4INM UC625 rev 24
In sub station applications it is common for a number of annunciators to share a common set
of controlling pushbuttons, the pushbutton inputs can therefore be connected between units
as required.
In addition to the full alarm capability each power failure alarm channel is also equipped with a
Signal Duplicating Relay to allow notification of power failure to 3rd party devices.
A volt-free contact is provided per supply input, which will change to abnormal on alarm and
remain in the abnormal state until power is restored.
The output can be changed to normally open or normally closed as required.
PLEASE NOTE:- the Signal duplicating contacts are not affected by the System Test
pushbutton and act as faithful slaves of the Signal Input.
2.6 Serviceability
All servicing is carried out from the front of the unit having first removed the legend plate.
The alarm boards are universal and thus fully interchangeable as required.
WARNING !
Installation, configuration and maintenance of this annunciator must only
be performed by competent service personnel
2.7 No Special Service Tools Required
A screwdriver is the only tool required to remove the legend plate to access the alarm and power
board, in order to replace or remove the circuit board to make adjustments to the DIL switches.

INM UC625 rev 24 5
3 INPUTS & OUTPUTS
3.1 Customer Connections
All connections to the alarm board inputs and outputs are made via quick disconnect, rising
clamp, two part plug-able connectors.
WARNING !
Power supplies using high voltage AC/DC primary sources
and optional high voltage field contact voltages may be present.
Ensure that the annunciator is powered down
before working on the unit or any connected apparatus.
3.2 Annunciator Inputs
The standard 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 120 300
Mains power supply inputs must be fused. Refer to instructions on page 28.
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.
3.3 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.
3.4 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.

6INM UC625 rev 24
3.5 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
3.6 Common Alarm Group Relay [GP]
Alarm channels can be connected to an internal common alarm group relay (GP), which is
normally used to indicate to remote equipment that an alarm has occurred in a local panel.
The Relay output contact state is set using LK3 on the SPR card to be either normally open or
normally closed. The contact will change state when an alarm occurs and remain in the alarm
state until all faults have returned to normal.
3.7 Reflash Function
After acknowledge if a new alarm occurs the relay will momentarily drop out and re-activate to
indicate that another alarm has occurred. The reflash function ensures that when monitoring the
alarms from a remote location, users are fully aware of alarm activity on the unit.
3.8 Dual Audible Alarm Feature
UC625 systems are supplied as standard with two integral audible alarms designated
critical audible and non critical audible. Each pair of alarms can be set to operate the
associated audible.
3.9 Dual Horn Relays [HNA-HNB]
All units are supplied with dual integral horn relays one for critical alarms – HNA and one for
non-critical alarms – HNB. Each pair of alarms within the unit can be set to operate either or
both of the relays as required. When an alarm occurs the horn relay contact will change state
and the contact will remain in the alarm state until the ack or mute pushbutton has been
pressed or the automatic ack timer has activated. The Customer can disable the automatic
timer circuit if required as described later in the manual.
3.10 Dual Power Monitoring Relays
Two integral power monitor relays are provided as standard, one monitors the primary supply
and one monitors the secondary supply input. The power monitor relays are factory set to be
normally energised and will de-energise if the primary or secondary supply fails. Each coil of the
relay can be set to be normally energised if required and the relay contact can be set, using LK1
(Supply 1) and LK2 (Supply 2) on the SPR card, to normally open or normally closed.

INM UC625 rev 24 7
4 MECHANICAL DETAILS
4.1 Alarm Card
Each alarm card provides all common alarm sequences as listed in the ISA
specification “Alarm Sequences and Specifications S18.1 1979 (R1985”). The
universal alarm card plugs into the edge connectors mounted on the inside of the
motherboard, the size of motherboard being determined by the total number of
alarms required.
4.2 SPR Card – Supply / Pushbutton/Relay
This module is the same size, shape and fixing as an alarm card and is equipped
with System Test, Acknowledge, Mute, & Reset pushbuttons necessary for all of the
available operating sequences.
This module is fitted in the extreme right hand edge connector within the
annunciator and is polarised to ensure it cannot be placed into the wrong card slot.
4.3 System Assembly
Systems are supplied pre-assembled with motherboards used to match each system
configuration (i.e. number of ways high is always 4 x number of cards wide, plus
a Supply/Pushbutton/Relay (SPR) Card with 2 ways always used for power failure
monitoring. The cards required (alarm ways divided by 4, plus “Alarm Sequences
and Specifications S18.1 1979 (R1985)”. Are plugged into the motherboard and the
appropriate legend plate is then fixed to the front of the unit.
4.4 UC625 Dimensions
NUMBER OF
ALARM WAYS
OVERALL SIZE
(H X W) MMS
CUT-OUT SIZE
(H X W) MMS
12 154 x 152 141 x136
16 154 x 180 141 x 164
20 154 x 208 141 x192
24 154 x 236 141 x 220
28 154 x 264 141 x 248
32 154 x 292 141 x 276
36 154 x 320 141 x 304
40 154 x 348 141 x 332
Table 1
Please note:- Cut-Out Dimensions have a tolerance of plus or minus 0.5 mm.
Unit Depth
All UC625 Units are 130 mm Deep

8INM UC625 rev 24
5 SEQUENCES
5.1 Summary
From the sequence tables shown later in the manual, it will be evident that an alarm occurring
causes a flashing visual indication with audible.
Mute is used to silence the audible only.
Acknowledge stops the flashing and audible.
Please note:- If a new alarm occurs on an already acknowledged system, the horn will re-sound
and the new alarm will flash in accordance with the selected sequence.
Reset will return the alarm to the normal off state only when the unit has been acknowledged
and the associated alarm contact has returned to normal.
5.2 First-up Sequences
When a group of alarms is initiated, it is often important to know which of them was the first to
occur. This is achieved by having the first-up alarm flashing in a different manner compared to
the subsequent alarms. Three different first-up sequences are available F0, F1, F2 as detailed
below and in the following sequence tables. First-up operation should be used with care with
the auto-reset sequence and non-latch sequence as momentary alarms can cause ambiguity.
F0 The standard mode adopted by RTK Instruments, which indicates the first-up alarm by
flashing at twice the rate of subsequent alarms.
F1 In this mode subsequent alarms appear in the acknowledged state, hence they do
not flash. The audible device does not operate when subsequent alarms occur,
unless still operating from the first alarm. The acknowledge pushbutton will reset the
first-up indication.
F2 In this mode all subsequent alarms do not flash, they will however operate the audible
device. The acknowledge pushbutton will reset the first-up indication.
5.3 Automatic Reset
In this mode, any signal contact which returns to normal after the acknowledge pushbutton
has been pressed will automatically reset. If the alarm contact returns to normal prior to
acknowledge the alarm will reset immediately after the acknowledge pushbutton has been
operated.
5.4 Non-latch Sequence (No lock-in)
In this mode alarms will automatically reset as soon as the signal input returns to the normal
state. It is therefore possible that a fleeting alarm will occur and return to the off state without
operator intervention. Whilst the alarm is in the abnormal state the operator can silence or
acknowledge the alarm in the normal way.

INM UC625 rev 24 9
5.5 Reflash Feature
In the standard mode, when an alarm has occurred and the acknowledged pushbutton
activated, any further changes of state to the alarm contact will not affect the alarm window
display. With reflash enabled any alarm that returns to normal and re-occurs will re-initialise the
window.
5.6 Ringback Sequence
This mode uses visual and audible signals to indicate that the alarm has returned to normal and
the operator can reset the alarm. When an alarm contact returns to normal the ringback circuit
will pulse the audible alarm and the associated LED will flash at approx half the speed of the
normal alarm flash rate. Ringback operation may be used with all but non-latched and auto reset
sequences and operates in the same way for all first-up sequences F0 to F2.
5.7 Two Pushbutton Operation
In certain circumstances using remote pushbuttons, it may be desirable to use only two
pushbuttons: Reset and Lamp Test. The Reset pushbutton is used to Acknowledge an alarm if
the contacts are in the alarm condition and to Reset it if the contacts are clear.
5.8 Status Only Operation
In applications where the user wishes to indicate the current status of plant machinery the
channel can be set to status only. In this Mode the associated LED will be either on or off as
the Input changes state. Example:- alarm normal = PUMP ON : alarm abnormal = PUMP OFF.
Please note:- This feature is only selectable in pairs ( Channel 1 & 2 or Channel 3 or 4 ).
Please refer to the last page of the manual for details of the switch settings required for each of
the following sequences.
5.9 Option M4
When option M4 is specified in the Model No a combined Lamp / Audible Test is provided in
place of Lamp Test

10 INM UC625 rev 24
5.10 Sequence Configuration and Tables
Each pair of alarm channels can be configured to suit the operating sequence required, as listed
in the ISA publication “Alarm Sequences and Specifications” S18.1 1979 (R1985)”. Systems can
be configured with different features on each pair of alarms and there is no need to switch the
power off. Different operating modes can be selected using the on board DIL switches. The
following tables show the most commonly used examples.
5.10.1 Manual Reset ISA-Sequence M
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
Abnormal Flashing ON
Abnormal Acknowledge ON OFF
Normal Reset OFF OFF
Table 2
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Alarms must be set to lock-in of momentary
3. Manual reset of acknowledged alarms is only possible after process conditions
return to normal
5.10.2 Automatic Reset ISA-Sequence A
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
Abnormal Flashing ON
Abnormal Acknowledge ON OFF
Normal OFF OFF
Table 3
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Alarms must be set to lock-in of momentary
5.10.3 Non Lock-in Function ISA-A-4 Sequence

INM UC625 rev 24 11
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
Abnormal Flashing ON
Normal Before Ack OFF OFF
Abnormal Acknowledge ON OFF
Normal OFF OFF
Table 4
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Alarms should be set to non-lock-in
3. Alarms will automatically return to the off state as soon as the input returns
to the normal
5.10.4 Ringback ISA-R Sequence
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
Abnormal Flashing ON
Abnormal Acknowledge ON OFF
Normal Slow Flash Pulsing
Reset OFF Off
Table 5
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Alarms should be set to lock-in
3. Only available in first-up modes F1, F2
5.10.5 Automatic Reset First-up ISA-F1A Sequence
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
1st Alarm Abnormal Flashing ON
Subsequent Abnormal ON ON
Acknowledge
1st Alarm Abnormal ON OFF
Subsequent Abnormal ON OFF
Normal OFF OFF
Table 6
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Subsequent alarms do not lock in
3. Once acknowledged the first up alarm is reset.

12 INM UC625 rev 24
5.10.6 Manual Reset First-up ISA-F2M-1 Sequence
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
1st Alarm Abnormal Flashing ON
Subsequent Abnormal ON ON
Acknowledge
1st Alarm Abnormal ON OFF
Subsequent Abnormal ON OFF
Normal Reset OFF OFF
Table 7
Sequence features
1. System test simulates an abnormal plant state on all alarms
2. Subsequent alarms do not lock in alarms must be reset after inputs return to normal
5.10.7 Status Only ISA-A-4-5-6 Sequence
PROCESS PUSHBUTTON VISUAL AUDIBLE
Normal OFF OFF
Abnormal ON OFF
Return to Normal OFF OFF
Table 8