Apricorn | AMKF-1 | REVISED - - - ATM72 Auto Transfer Module

REVISED - - - ATM72 Auto Transfer Module
Capricorn Controls
DA01ATM1-1 Data & Application Note
Page 1 of 8
REVISED - - - ATM72 Auto Transfer Module
Genset Controls - Timers - Monitors - Trips - Battery Charging - Spares & Accessories - Custom Products
Effective November 1st 1998
This design has been revised to include the following ---
(1) Insulated Back
The internal construction of one full-length printed circuit board (Pcb)
and one rear Pcb has been replaced with an insulated back and two fulllength printed circuit boards. One Pcb each for the DC and AC circuits,
thus improving ‘DC’ to ‘AC’ isolation.
Please note – the connectors are now Pcb mounted and are therefore
in the vertical plane.
(2) Adjustable ‘Mains Available’ threshold (not ATM72D)
85 – 220VAC (300V absolute max.) for 220/240V systems … pre-set at 180V unless specified otherwise.
30 -- 99VAC for 110/120V systems … specify with order.
Set to minimum if external Phase monitoring used.
(3) Adjustable ‘Alternator Available’ threshold
85 – 220VAC (300V absolute max.) for 220/240V systems… pre-set at
180V unless specified otherwise.
30 -- 99VAC for 110/120V systems… specify with order.
Set to minimum if external Phase monitoring used.
(4) ‘Delay’ between contactor operations.
A nominal 2-second delay has been added to ensure a dwell time between
one contactor opening and the other closing.
Please specify with order for other delays (max of 10 seconds).
(5) Separate Mains & Standby control relays
This allows delay between contactor change-over (see above), improves
AC ‘Mains’ to ‘Standby’ isolation and increases relay contact ratings from
5Amp (resistive) to 16Amp (resistive).
Note: For Inductive Loads, the (resistive) rating must be de-rated to 14%. That is, 16Amps (resistive) =
2.2Amps continuous into an Inductive Load to ensure that Inrush currents do not exceed the contact
rating.
(6) Transient Protection
A ‘Transorb’ device has been fitted to improve (DC) transient protection.
Designed & manufactured in England by Capricorn Controls
Telephone: +44 (0) 1295 272360 Fax: +44 (0) 1295 264766 E-mail: sales@ capricorn-controls.com
Page 2 of 8
E. & O. E.
The Proven Solution to Power Controls
DA01ATM1-1
Capricorn Controls
DA01ATM1-1 Data & Application Note
Page 3 of 8
ATM72 Auto Transfer Module
Genset Controls - Timers - Monitors - Trips - Battery Charging - Spares & Accessories - Custom Products
The ATM72 Auto-Transfer-Module is typically
employed with the RSM72 Remote Start Module to
provide an economical yet highly versatile AMF
system. However, it can also operate as a ‘stand-alone’
module to upgrade existing ‘Remote Start’ systems.
Set in a compact 72mm sq DIN standard module
this ‘Auto Transfer Switch’ can provide - (single
phase) AC voltage monitoring of both the Mains
supply and the Alternator together with a contactor
control relay and three ‘user adjustable’ timers for
Start Delay, Run On (on Load) and Stop Delay
timing.
The front panel has up to five ‘High Intensity’
LED’s to indicate system status.
Typical AMF Operation
With DC power connected, ‘Mains Available’ and ‘Mains on Load’ Led’s lit, the ATM72 is in
‘Standby’ mode. If the Mains input falls below the pre-set threshold for the duration of (T3) the ‘Start
Delay’ timer, the Run relay will energise and latch, signalling for the Genset to start. As the Genset runs
upto speed and the Alternator AC voltage rises above its pre-set threshold, the ‘Alternator Available’
Led lights and approx. 3sec’s later the Standby Contactor energises. The load will now continue to be
supplied from the Alternator until such time as the Mains Supply returns.
If a fault condition occurs (i.e. ‘Low Oil Pressure’), the Remote Start Module will Shut-down the
Engine and signal this ‘Alarm’ state to the ATM72 via the ‘Interlock’ on Term.27. This holds the Run
Relay energised (to maintain DC power to the Remote Start Module) and de-energises the COR relay,
dropping the Standby Contactor and thus preventing the Alternator from running down into the load !
Alternatively, if the Mains Supply returns in the normal way to a level above the pre-set threshold for
the duration of (T4) the ‘Run-On (on Load) Delay’ timer, the COR relay will de-energise, dropping the
Standby Contactor and returning the Load to the Mains. Provided that the Mains Supply remains
healthy for the duration of (T5) the ‘Stop Delay’ timer, the Run Relay will de-energise (signalling for
the Genset to Stop) and the ATM72 will return to its ‘Standby Mode’.
If on the other hand, the Mains supply were to fail again during the ‘Stop Delay’ period, the
Load would be immediately transferred back to the Alternator and the Stop Timer (T5), reset.
To guarantee that the Mains Contactor only energises and de-energises within specified
voltage limits, an external Phase Failure Monitor may be required. Likewise, if the Alternator is
to supply the Load to close tolerances on voltage &/or frequency, further monitoring may be
needed.
The ‘Manual’ input can power the Module. It also sets the Run relay so that in the event of a
‘Mains Failure’ occurring during Manual Off-Load running, the Standby Contactor can
energise as quickly as possible without waiting for the ‘Start Delay’ timer to elapse.
Designed & manufactured in England by Capricorn Controls
Telephone: +44 (0) 1295 272360 Fax: +44 (0) 1295 264766 E-mail: sales@ capricorn-controls.com
Page 4 of 8
‘TYPICAL’ CONNECTIONS
Always ensure that the correct wire sizes are used and that all terminals are tightened correctly.
Terminal
Description
Input / Output
Connect To ------
21
22
23
24
25
26
27
28
29
30
B+
B-
+Ve Supply
- Ve Supply
Run Relay N/C contact
Run Relay C/O contact
Run Relay N/O contact
MANUAL
Manual Input
INT
‘Interlock’
Lamp Test
+Ve Lamp Test Supply
Alt. On Load
Alternator On Load Status
Mains on Load Alternator On Load Status
Input
Input
+Ve Input
- Ve Input
+Ve Input
- Ve Input
- Ve Input
RSM72, Term.11 (Manual, +Ve O/P)
31
32
33
34
35
36
37
38
(See Text)
(See Text)
Input
Input
N/C Contacts
N/C Contacts
N/O Contacts
N/O Contacts
A.C. Input
A.C. Input
(See Text)
(See Text)
(See Text)
Mains Contactor Coil
Standby Contactor Coil
(See Text)
Main Alternator (270VAC max)
Main Alternator
‘Mains’ Voltage Sensing
‘Mains’ Voltage Sensing
COR
Change-over Relay
ALT. (L)
ALT. (N)
Alternator Voltage Sensing
Alternator Voltage Sensing
Volt Free Contact
Volt Free Contact
Volt Free Contact
RSM72, Term.17 (Auto Mode +Ve O/P)
Battery -Ve
(not normally used)
RSM72, Term.17 (Auto +Ve O/P)
RSM72, Term.18 (Run, +Ve I/P)
RSM72, Term.14 (Alarm O/P)
Common ‘Lamp Test’ circuit
Standby Contactor (n/o ‘Aux.’ contacts)
Mains Contactor (n/o ‘Aux.’ contacts)
Standard Build Options
ATM72A ....The ‘A’ version senses a single phase AC voltage on Term.31 & 32 to detect a ‘Mains
Failure’ condition. Typically used - - in AMF systems, with or without an external Phase
Failure Monitor.
ATM72D ....The ‘D’ version senses the Loss of a DC voltage on Term.31 (Term.32 not used) as a
‘Mains Failure’ or ‘Start’ condition. Typically used - - where greater versatility is needed,
in Multi-Set systems and special builds.
BEWARE - Units with ‘A’ , ‘D’ &/or ‘V’ options may not be interchangeable !
ATM72_V...The ‘V’ = volt-free (COR) contacts (Term.32 / 33 & 36 / 37 are not connected internally)
Typically used - - where the COR relay is required to switch DC ‘slave’relay(s).
Please refer to our latest ‘Catalogue & Price List’ to select the models to suit your ‘Specific’
applications.
WARNING - - WARNING - - WARNING - - WARNING - - WARNING
Voltages dangerous to human life may be present at some of the terminal connections of
this unit. Ensure all supplies are Isolated before attempting any connection / disconnection.
E. & O. E.
The Proven Solution to Power Controls
DA01ATM1-1
Capricorn Controls
DA01ATM1-1 Data & Application Note
Page 5 of 8
.
ATM72 ‘Upgrade to AMF’
Designed & manufactured in England by Capricorn Controls
Telephone: +44 (0) 1295 272360 Fax: +44 (0) 1295 264766 E-mail: sales@ capricorn-controls.com
Page 6 of 8
Negative O/P for use with EXM Modules
RSM72KWX + ATM72D = Mains Failure System
E. & O. E.
The Proven Solution to Power Controls
DA01ATM1-1
Capricorn Controls
DA01ATM1-1 Data & Application Note
Page 7 of 8
FAULT FINDING ----- ATM72 BASED SYSTEMS
Always check the ‘obvious’ first i.e. :
♦
♦
♦
♦
♦
♦
System correctly wired
Correct ATM72 type fitted
Timers T3, T4 and T5 set to suit the specific application
All connections use suitably rated cables to comply with all appropriate regulations.
All terminal screw connections are tight.
Battery(s) are charged, in good condition, with clean & tight connections and of the correct voltage
WARNING - Incorrect wiring can permanently damage the module i.e. 1/ Loss of battery negative (Term.22) or a loose connection
2/ Connecting any ‘Active low’ outputs (i.e. INT) directly to a positive supply.
3/ Connecting any DC terminals to an AC supply.
• Unit Dead - set will not start
Check for a positive supply on term.21(B+) or term.26 (Manual) and a negative supply on term.22 (B-) of the
ATM72 using a DC voltmeter or by shorting term.21 &/or term.26 to term.19 (lamp test) and observing if the
Led’s all light.
• Mains on Load - but the status Led not lit
Term.30 must connect to Battery -Ve via n/o auxiliary contacts on the mains contactor.
• Mains failed but Genset does not start
Engine control module (i.e. RSM72) switched ‘Off’.
Terminals 24 or 25 are disconnected by external circuitry (intentionally or otherwise)
• Mains failed, Genset starts but will not take the load
‘Alternator Available’ Led NOT lit - Alternator voltage below threshold of ATM72 (typically 180V on 230V
system)
- Alternator voltage not connected to terminals 37 & 38 (i.e. Blown fuse)
‘Alternator Available’ Led lit
- Incorrect wiring to the contactors
- Term. 27 (INT) connected to Battery -Ve
• Genset on load - but the status Led not lit
Term.29 must connect to Battery -Ve via n/o auxiliary contacts on the alternator contactor.
• Mains returns but the load is not transferred back
‘Mains Available’ Led NOT lit - Mains voltage below threshold of ATM72 (typically 180V on 230V system)
- Mains voltage not connected to terminals 31 & 32 ( i.e. Blown fuse)
‘Mains Available’ Led lit
- T4 the ‘Run on’ (on load) timer (typically 30s - 30m) is set to high
- The mains is not stable for this period.
• Mains returns and load is transferred back but the Genset will not stop
Engine control module (i.e. RSM72) switched to MANual
Terminals 24 & 25 connected by external circuitry (intentionally or otherwise)
Designed & manufactured in England by Capricorn Controls
Telephone: +44 (0) 1295 272360 Fax: +44 (0) 1295 264766 E-mail: sales@ capricorn-controls.com
Page 8 of 8
SPECIFICATION
DC Supply :
12/24V Single range supply. < 4V Dropout / 40V Absolute Maximum.
Burden = 25mA Standby, 100mA Maximum.
Mains Sensing : 10 - 300VAC (absolute maximum) Single Phase. No hysteresis.
Threshold = 180V (for 220/240V systems) & 90V (for 1100/120V systems) or as specified.
Alternator Sensing : 10 - 300VAC (absolute maximum) Single Phase. No hysteresis.
Threshold = 180V (for 220/240V systems) & 90V (for 1100/120V systems) or as specified.
Relay Contacts :
Timers :
RUN Relay = SPCO rated at 16A / 60VDC (Resistive Load)
COR Relay = DPCO rated at 5A / 230VAC (Resistive Load)
T3 Start Delay
Warm-up Delay
T4 Run-On Delay
T5 Stop Delay
0.5 - 30 sec User Adjustable
Fixed 3 sec
30s - 30 min User Adjustable
4s - 4 min User Adjustable
(unless specified otherwise)
(unless specified otherwise)
(unless specified otherwise)
(unless specified otherwise)
General : Ambient temperature -100C to +550C Operating, -250C to +700C Storage
Protection : ‘Varistor’ devices are fitted (internally) across each contact set of the changeover relay (COR) to
minimise arcing and hence prolong the contact life. The are also fitted at the ‘Mains’ and
‘Alternator’ terminals to protect the sensing circuitry.
Construction :
Through panel fitting, 72mm sq. DIN standard case. Reversed screen printed “LEXAN”
front panel. Printed Circuit Boards, varnished as standard.
Dimensions
Notes :
1/ Not to Scale
2/ All dimensions
in
3/ Panel Cut-Out
68 x 68 mm
72
72
152
MOUNTING
The module must be fitted into a suitable control panel which provides adequate protection from the
extremes of : Temperature, Humidity & Vibration. If this control panel is set-mounted then suitable
‘Anti-Vibration’ mounts MUST be used
Note : If specific information &/or a replacement unit is required, please ensure that the ‘Serial
Number’ of the original unit is always quoted.
CAPRICORN CONTROLS LIMITED
INDUSTRIAL ELECTRONIC ENGINEERS
SPECIALIST CONTROLS FOR ENGINE APPLICATIONS
Thorpe Close, Banbury, Oxon., OX16 4SW. England
Tel: +44 (0) 1295 272360 Fax: +44 (0) 1295 264766
E-mail: sales@capricorn-controls.com Web: www.capricorn-controls.com
Keystart, Remote Start, Start-on-Demand, Mains Failure, Mutual Standby & Multi-set Controllers.
Annunciators and Lamp Modules. Voltage, Current, Frequency, Speed, and Temperature Monitors.
Timers. Transport Refrigeration Spares. Batteries, Battery Chargers and Power Supplies. Spares and
Accessories. Customised Products and Bespoke Designs.
E. & O. E.
The Proven Solution to Power Controls
DA01ATM1-1
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