Relay Configuration - Siemens Water Technologies Series Manual

3.2.4

Relay Configuration

WT.050.130.000.UA.IM.1108
ACUTEC™ 35 SYSTEM
The Gas Detector is factory set to alarm when gas concentrations above
the chosen setpoints are exceeded; however, if switch A1 is set to the
ON position, alarms will be initiated when gas concentration is below
the setpoint.
• FACTORY CONFIGURATION OF RELAYS —
* Relay 1 – Configured to trip above the Warning setpoint and set
for normally energized, non-latching operation.
* Relay 2 – Configured to trip above the Alarm setpoint and set for
normally energized, latching operation.
* Relay 3 – Configured to trip above the Alarm setpoint and set for
normally energized, latching operation, not for horn operation.
* Alarm Delay – Configured for two-second delay.
• WARNING OR ALARM — Each relay can be assigned to either the
Warning or Alarm setpoint. As shown in the DIP SWITCH FUNCTIONS
chart, switches D3, D6, and C6 configure each relay. When Warning is
selected, the relay will activate when the Warning lamp on the front
panel lights. When Alarm is selected, the relay will activate with the
Alarm lamp on the front panel.
• NORMALLY ENERGIZED/DE-ENERGIZED — Relays one through three
are factory set to the normally energized mode, providing "Fail-Safe"
operation. This means the relays are energized in a normal condition
and will de-energize for a Warning or Alarm condition, or if power is
lost to the system. However, operation in this mode will reduce the
period of operation on Battery Back-up. The relays may be set to the
normally de-energized mode by setting switches C8, D5, and D8 to
the off position. To avoid battery drain and internal heat generation,
unused relays should be set to Normally De-Energized.
• LATCHING OR NON-LATCHING — Relays may be either Latching
or Non-latching. A latching relay activates when gas concentration
exceeds the setpoint, but will only de-activate when the push-button
on the front of the receiver is pressed after the gas concentration has
fallen below the setpoint. A non-latching relay will automatically de-
activate when the gas concentration falls below the setpoint. Selec-
tion of the latch/non-latch function uses switches D4, D7, and C7.
• EXTERNAL HORN RELAY — Relay 3 provides an additional configura-
tion option not available on relays 1 or 2. Switch C5 allows Relay 3 to
be configured for use in activating an external audible horn. When
switch C5 is on, any external horn tied to Relay 3 will sound intermit-
tently when the warning setpoint is exceeded and will go to steady-on
when the alarm setpoint is exceeded. The relay will de-activate when
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