Metrix 440 - Page 7

Doc# 90018-031 • REV L (April 2016) Page 7 of 16
5.1.1 Input Power
Connect a grounding wire to the grounding screw provided in the switch. This is impor-
tant for safety as well as noise. For AC powered units, power only with the voltage level
indicated on the inner cover label. Orientaon of AC power to terminals 1 and 2 is not
important. For DC powered units, connect +24V to Pin 1 and Ground to Pin 2.
5.1.2 Shutdown Circuit
The internal shutdown switch circuit is designed to be wired in series with the external
shutdown circuit i.e.; motor starter, relay, contactor, etc.
5.1.3 RemoteReset
Shielded wire is required. To avoid creang ground loops, the N.C. remote switch contacts
should be electrically isolated from other circuits or grounds. NOTE: Remote reset is dis-
abled if pushbuon reset opon is selected.
Lockout(Oponal)
Terminal 7 will be labeled “Lockout”. Shielded wire is recommended. To avoid the possibility
of ground loops, the remote N.O. lockout switch contacts should be electrically isolated from
other external circuitry or grounds.
5.1.4 4-20mAAnalogOutput
To avoid the possibility of ground loops, the 4-20 mA remote meter terminals should be
electrically isolated from external grounds. Shielded wire is recommended to protect
against damage due to long wire runs and the possibility of high induced voltage spikes
from storms, etc. The 4-20 mA output is self powered and therefore requires no external
power source.
5.1.5 AlarmCircuits
The internal single pole solid state switch between terminals 13 and 14 is designed to be
wired in series with the external alarm circuit i.e.; annunciator, lamp, relay, etc.
5.2 FunconalDescriponandInstallaonConsideraons
5.2.1 Alarm or Shutdown
5.2.2 UnitswithTriacOutputs(orderingoponsDand/orE=1)
The triacs used in model 440/450 vibraon switches carry medium power rangs and are
useful in controlling relays, contactors, and most motor starters directly. Maximum noise
immunity is obtained when used in the open on alarm (N.C.) mode. Consult Metrix prod-
uct datasheet 1004730 for comprehensive specicaons pertaining to triac outputs.
5.2.3 UnitswithAnalogSwitch(FET)Outputs(orderingoponsDand/orE=2)
For light loads such as computers or PLCs, the analog switch output is easier to interface
since it has virtually no leakage current. The analog switch does not require the 50 mA
holding current of a triac and operates equally well with AC or DC. Consult Metrix product
datasheet 1004730 for comprehensive specicaons pertaining to FET outputs.
NOTE: DR models have both Shutdown and Alarm
circuit present; SR models have only Shutdown circuit.