ERL tesla lite, User Manual, Page: 22 / 288

2 Connection and Power Up
2-2 TESLA LITE User Manual D03283R01.10
2.3 Signal Connections
External Input
Channels
The recorder’s external inputs are dry inputs intended for use with signals from
a 48/125/250 Vdc station battery. The external inputs are isolated and protect-
ed against transient surges. They activate at approximately 32 Vdc.
Alarm Contacts
The alarm contacts on the rear of the unit are dry contacts. They are isolated
and protected against transient surges. The contacts are designated as follows:
1. User-configurable
2. User-configurable
3. User-configurable
4. User-configurable
5. User-configurable
6. Cross-trigger
7. Recorder function
The cross-trigger contact is used to initiate recording on another recorder when
this unit triggers. When activated, the cross-trigger contacts close for 0.10 sec-
onds, regardless of the duration of the triggering condition. This ensures that
the cross-trigger function does not become blocked by a continuous trigger
condition.
The user-configurable alarm contacts can be defined for use as part of the re-
corder’s trigger configuration.
IRIG-B Time
Signal
The BNC connector on the rear of the unit accepts either modulated or unmod-
uled IRIG-B time signals, with or without the 1344 extensions.
Communication
Ports
See “Communicating with the Recorder (IED)” on page 4-2.