5
installation
VFD Safety/Run Circuit or Motor
Starter Contactor Coil Circuit
BMS Alarm
Ground
Sw 1
Sw 2
COMMON
NC
NO
NC
NO
COMMON
Figure 1
Field Wiring
Typically this switch is used to shut off the tower fan motor and provide an alarm.
The switch has two SPDT (single pole double throw) contacts operating in
unison providing a contact closure or contact opening in the event of a trip.
The NC contact of Sw 1 may be used to complete a safety/start circuit of a
VFD or motor starter. When the switch trips this contact will open and break
the circuit. The NO contact of Sw 2 may be used to complete the alarm circuit.
When the switch trips this contact will close and complete the alarm circuit.
Internal Switch Contact Ratings
The vibration switch uses two SPDT switch terminals with removable screws
for all connections (see below). Wire the switch contacts depending on ap-
plication, either Normally Open or Normally Closed. The Normally Open and
Normally Closed are referenced to the Common screw terminal connector.
Do not exceed the maximum relay ratings as noted below.
Rated Voltage
Resistive Load
Inductive Load
Motor, Lamp Load
NC
NO
AC 125V
15A
10A
4A
2A
AC 250V
15A
10A
3A
1.5A
AC 480V
3A
2A
-
-
DC 8V
15A
15A
-
-
DC 14V
15A
10A
-
-
DC 30V
6A
5A
-
-
DC 125V
0.5A
0.05A
-
-
DC 250V
0.25A
0.03A
-
-
Caution
