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Powering Up the IOLAN
48 IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0
Wiring up a DHV unit
Terminal # Description Usage
1 Normally 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.
2 Common Common is a fail-safe relay connection. Use this terminal in
conjunction with the Normally Open or Normally Closed terminals.
3 Normally
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.
4 Chassis 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).
E Earth Ground Earth Ground is a connection to the chassis that can be used for
earth bonding.
NOTES: