Powering Up the IOLAN
48 IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0

Wiring up a DHV unit

Terminal # Description Usage
1Normally Open Normally Open is a fail-safe relay connection. Use this with the
Common terminal to act as switch contacts that remain open when
the unit is powered off or in a failure state.
2Common Common is a fail-safe relay connection. Use this terminal in
conjunction with the Normally Open or Normally Closed terminals.
3Normally
Closed Normally Closed is a fail-safe relay connection. Use this with the
Common terminal to act as switch contacts that remain closed
when the unit is powered off or in a failure state.
4Chassis Ground Chassis Ground must be connected to "Equipment Ground" for DC
installations or "Safety Ground" for AC installations.
5+ / L (source 1) + / L (Source 1) is connected to the positive (+) input for DC
sources or to the Live input for AC sources. Use with partner
terminal -/N(Source 1).
6- / N(source 1) - / N (Source 1) is connected to the negative (-) input for DC
sources or to the Neutral input for AC sources. Use with partner
terminal +/L(Source 1).
7+ / L (source 2) + / L (Source 2) is connected to the positive (+) input for DC
sources or to the Live input for AC sources. Use with partner
terminal -/N(Source 2).
8- / N(source 2) - / N (Source 2) is connected to the negative (-) input for DC
sources or to the Neutral input for AC sources. Use with partner
terminal +/L(Source 2).
EEarth Ground Earth Ground is a connection to the chassis that can be used for
earth bonding.
NOTES: