CHART MVE 1839 - Remote Alarm Tests

MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H • 101
-----
Ω
(-)
(+)
7.5. Remote Alarm Tests
7.5.1. Global Remote
The Global Remote contacts can be checked for continuity using a digital multimeter or ohm
meter.
• Normal State (No Alarms)
There should be continuity between the COM and NC terminals
The COM – NO circuit should be open
• Alarm State
There should be continuity between the COM and NO terminals
The COM – NC circuit should be open
7.5.2. Discrete Contacts
The Discrete Contacts can be tested for continuity using a digital multimeter with diode check.
Since the Discrete Contacts are open collectors, the diode check function ( ) should be
used.
• Normal State (No Alarms)
All Discrete Contact terminals should be open with respect to COMMON
• Alarm State
There should be continuity between the specific active alarm terminal and
COMMON. Inactive alarms should remain open with respect to COMMON
-----
Ω
(-)
(+)