Honeywell Vertex VC 4 User Manual page 35

Ratings
To ensure reliable contact operation, the following limits must be observed:
0.1 to 2.0 amps
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@5-24 VDC or
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@5-120 VDC
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The alarm relay has a minimum load requirement of greater than 5V and 100 mA. For reliable relay operation,
ensure the alarm circuit meets these requirements. The relay contacts are protected by metal oxide varistors rated
for 120 VAC maximum operation.
Wiring Guidelines
To wire the alarm relays:
• Use shielded cable or conduit. See Specification for additional cable information
Failure to replace and retighten hardware after servicing can adversely affect instrument performance and EMC
compliance. Make certain all fasteners are reinstalled and firmly tightened. This will ensure a proper ground.
Connect grounds to stud at lower left corner of the I/O panel. See Figure 3-11
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Use #8 hardware provided
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Use a single, solid or stranded wire (not exceeding 14 gauge) per terminal block connection
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Do not switch DC current with the relay contact unless you are using counter electromotive force (CEMF)
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protection such as a suppression diode
Do not use the VERTEX™ VC4 power supply for external alarm power
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NOTE
Make sure all connections comply with applicable RFI/EMI standards
TM
Vertex VC4 System
CAUTION
CAUTION
33 User Manual