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This manual is subject to change without notice. You may obtain the newest version of the manual at www.lamarchemfg.com
106 Bradrock Dr. Des Plaines, IL 60018-1967
CPN 108622
Instruction Drawing Number:P25-LOPT204-1
Tel: 847-299-1188 Fax: 847-299-3061 Revision: A01 Rev. Date: 07/17 ECN:21502
La Marche Manufacturing Company | www.lamarchemfg.com
Option 204
Combined Alarm Package
Operation Manual
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1.0
Option 204 – Operation
1.1
General Description
The 204 option is a combination alarm package which allows monitoring the status of the charger via alarm contacts on
the S2A-294 alarm board. The alarm board includes one set of form “C” contacts which are accessible on terminals TS-
1 & TS-2 for each of the following alarms (refer to Figure 1):
Low Voltage
High Voltage
Low Current
AC Power Failure
Three red LEDs are also included on the 294 board as status indicators for the Low Voltage, High Voltage, and Low
Current alarms.
2.0
Alarms
The available alarms for option 204 are: Low Voltage, High Voltage, Low Current, AC Power Failure. The corresponding
alarm LED will illuminate when an alarm is triggered, if applicable. Each set of alarm relays have two sets of form “C”
contacts which function identical to each other. Not all alarm relays function the same; refer to Table 1 for the logic of
each alarm and refer to Table 2 for alarm contact specifications. In terms of the LEDs, all will illuminate when the
corresponding alarm is triggered.
Load
Resistive Load (P.F. = 1)
Contact Material
Ag (Au clad)
Maximum Allowed Current
2 A
Max. Operating Voltage
and Current
0.5 A at 125 VAC
0.25 A at 125 VDC
2 A at 30 VDC
Max. Switching Capacity
62.50 VA
60 W
Min. Permissible Load
10 µA, 10 mVDC
Alarm
Logic
Low DC Voltage
De-Energize On Fail
High DC Voltage
Energize On Fail
Low DC Current
De-Energize On Fail
AC Power Failure
De-Energize On Fail
Figure 1 – Customer Connections to Alarm Contacts
Table 1 – Alarm Logic
Table 2 – Alarm Contact Specifications
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2.1 Alarm Definitions
The LOW VOLTAGE ALARM will trigger and the red LED1 will turn on if the DC voltage falls below the specified
voltage threshold of the alarm for longer than 5 seconds. The alarm will clear once the low DC voltage condition is no
longer present.
The HIGH DC VOLTAGE ALARM will trigger and the red LED2 will turn on if the output DC voltage rises above the
specified voltage threshold of the alarm for longer than 5 seconds. The alarm will clear once the high DC voltage
condition is no longer present.
The LOW DC CURRENT ALARM will trigger and the red LED3 will turn on if the output DC current of the charger
falls below the alarm threshold for longer than 5 seconds. This alarm can be disabled if considered a nuisance alarm.
The AC POWER FAILURE ALARM will trigger if the AC power to the charger is lost. There is no AC Power Failure
LED, only alarm contacts. The alarm will automatically reset when AC power is restored to the charger.
Table 3 – Alarm Default Values and Indications
†V/C – Volts per Cell, LA – Lead Acid, NC – Nickel Cadmium
NOTE: These recommended parameters are set as factory default settings. If required, change the alarm threshold
levels after verifying with battery manufacturer.
2.1
Alarm Connection Procedure
Before making any alarm connections, ensure that the AC power is off at the main breaker. Verify that no voltage is
present by using a voltmeter at all AC and DC terminals.
For relays mentioned as ENERGIZED on alarm condition:
If it is desired that the annunciator be active until the alarm triggers, connect the annunciator leads to the NC and C
contacts of the desired alarm (located on the terminals on S2A-294 board). If it is desired that the annunciator be
deactivated until the alarm triggers, connect the annunciator leads to the NO and Ccontacts of the desired alarm.
For relays mentioned as DE-ENERGIZED on alarm condition:
If it is desired that the annunciator be active until the alarm triggers, connect the annunciator leads to the NO and C
contacts of the desired alarm (located on the terminals on S2A-294 board). If it is desired that the annunciator be
deactivated until the alarm triggers, connect the annunciator leads to the NC and Ccontacts of the desired alarm.
Alarm
Delay
(sec.)
Alarming
Threshold (V/C)†
LED Indication
Low DC Voltage
5
2 LA / 1.3 NC
LED1
High DC Voltage
5
2.4 LA / 1.65 NC
LED2
Low DC Current
5
0.5 Amps
LED3
AC Power Failure
0
–
–
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3.0
Adjusting Parameters
All equipment is shipped from the factory fully checked and adjusted based on the model number. Do not make any
adjustments unless the equipment has been powered-up and the alarm thresholds have been determined to be incorrect.
If the alarm thresholds have been determined to be incorrect, adjustments may be made as detailed below.
Adjust the output voltage/output current to the desired threshold. Turn the corresponding potentiometer so that the
LED is off; refer to Figure 2 for potentiometer and LED location. Slowly turn the potentiometer the opposite direction
until the LED just turns on.
Figure 2 – Alarm LEDs and Threshold Potentiometer
P3 – High Voltage Alarm Threshold Adjustment
P2 – Low Voltage Alarm Threshold Adjustment
P4 – Low Current Alarm Threshold Adjustment
LED2 –
High Voltage Alarm LED
LED3 –
Low Current Alarm LED
LED1 –
Low Voltage Alarm LED
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