Metrix 440 - Page 2

Doc# 90018-031 • REV L (April 2016) Page 2 of 16
NOTE: Discrete outputs should be manually bypassed during
this procedure, parcularly if used to trip the machine. They will
change state aer the me delay, and should be externally jump-
ered or otherwise disabled to prevent nuisance trips.
Calibrated setpoint controls
enable operator to set specic
velocity alarm/shutdown levels.
Adjustable me delay of 2-15 seconds.
LED illuminates immediately when vibraon ex-
ceeds setpoint (but alarm or shutdown discrete
outputs will change state only aer me delay).
1.3UserInterface
KeyCapabilies(connued)
switches have dual setpoints – one for alarm and one for shutdown – that are indepen-
dently adjustable.
• 4-20 mA output provides a convenient interface for trending and displaying vibraon
amplitude in a programmable logic controller (PLC), SCADA system, data logger, or oth-
er instrumentaon. 4mA corresponds to no vibraon, and allows the user to disnguish
between no power to the switch (0mA) and a funconal switch but with no vibraon
present (4mA). 20mA corresponds to full scale vibraon amplitude.
• Discrete outputs used for alarming and shutdown can be selected from triac, solid-
state analog switch (FET), or electromechanical relays, but must be specied at me of
ordering. These outputs are independently congurable for open on alarm/shutdown
or close on alarm/shutdown .
• An adjustable (2-15 seconds) me delay is standard. This prevents false alarms/shut-
downs on high startup vibraons and also from non repeve transient events.
• Self-test and vericaon: An LED adjacent to each setpoint control illuminates the
instant the measured vibraon level exceeds the setpoint. The unit can be periodically
veried on line by turning the setpoint control down unl the LED comes on. This set-
ng is then compared with the vibraon amplitude measured via a portable vibraon
meter at the same locaon as the switch’s sensing element, providing a vericaon
check of the unit.