Optional Alarm Switch
Special versions of the Link 10 are available, for additional charge, which include a solid state Alarm Switch to ground via rear panel terminal strip Pin #7. This option is used in a variety of settings such as lift pump lock out on fork lifts, two wire generator start/stop, audible low battery alarms, and charge controllers. The additional circuitry of the switch may not be retrofitted to the Link 10 in the field. It must be included at the time of manufacture.
The Low Battery Alarm Switch goes low to meter ground when the alarm is activated. In other words, a sinking FET switch to the meter's negative power lead is completed while the alarm is active. This lead is protected against polarity reversal so the "switch" connection has about 1 ohm of resistance. This should be taken into account when sizing relays or designing logic interfaces. The maximum amount of current that may be controlled by this circuit is 150 mA (0.150 A) at no more than 50 V. Below are two typical applications for the optional Low Battery Alarm Switch:
RELAY DRIVER DIAGRAM
> | Controlled Circuit |
|
AUDIBLE ALARM
+DC Alarm Power. Negative must be common to the Link 10.
RELAY COIL
+ - > To Pin 7, the Link 10 rear panel term. strip.
+DC Relay Power (<50 V). Nega-
tive must be common to the Link 10.
12 V or 24 V Piezo alarm <150 mA.
^ 12
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Alarm Defeat Switch
>To Pin #7 The Link 10
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