Alarm Level Settings - The SHERLOCK 402 allows you to
set a unique Level 1 and Level 2 Alarm Setpoint for up to 4
sensors. When an Alarm Setpoint is exceeded, alarm relays
activate. Each alarm setpoint has a programmable Delay of 0 to
120 minutes. Sensor readings are required to exceed an Alarm
Setpoint for the programmed amount of time before the control
activates the corresponding alarm relay contacts.
Alarm Indication - Alarms are logged to indicate which sensor
went in and out of alarm and when. The alarm log stores the last
32 alarms. When a sensor is in alarm, an LED for this sensor
on the front panel will light, the on-board beeper will sound and
the display will show the activated alarm level.
Systems Sensor Open Monitoring - The SHERLOCK 402 con-
stantly monitors the wiring to the sensors. If any sensor loses
communication for any reason, “OPEN” will appear on the dis-
play, the alams will activate and the condition logged.
Setback Alarm Settings - In some instances the control may
be expected to function in two different environments. The
SHERLOCK 402 provides a feature called SETBACK to
accommodate alternate alarm conditions. SETBACK provides
a secondary Alarm Setppoint and Delay. The control changes
to the setback parameters when a dry contact closes (i.e. air flow
switch, sail switch or timer switch) or on a daily schedule.
Alarm Relay Contacts - The SHERLOCK 402 provides two
fused SPDT (Single Pole Double Throw) relay outputs for each
for two alarm levels and a system alarm that switch positions
in the event of an alarm condition. Level 1 alarm activates the
K1A and K1B relays. Level 2 alarm activates the K2A and
K2B relays. System alarm activates the 3A and 3B relays.
Level 2 for each individual sensor can be disabled. Relays
K1B, K2B and 3B can be silenced (returned to non-alarm state)
when the SILENT button on the front panel is pushed. The
other alarm relays will remain active until the alarm condition
is cleared. The control can be programmed so the alarm is
cleared automatically when the sensor goes below the alarm
setpoint (UNLATCHED) or stay on until the alarm is manually
reset (LATCHED). The K1/K2 alarm level can be config-
ured so the relays are "Energized to Alarm" or "De-Energized
to Alarm", Common-Normally Open (C-NO) or Common-
Normally Closed (C-NC).
Optional Auxiliary Relays (SHER402-R) - Optional zone isola-
tion alarm relays (ZA - Sensor A Zone, ZB - Sensor B Zone,
ZC - Sensor C Zone, ZD - Sensor D Zone). Each relay can be
programmed to activate by level 1 or level 1 & 2 alarm.
Optional: Modbus RTU (SHER402-MB) - This option adds an
RS485 output that can communicate with a BAS.
1040 Fox Chase Industrial Dr
Arnold, MO 63010
Tel: 636-282-0011
Fax:636-282-2722
GENESIS INTERNATIONAL, INC.
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