4
CAUTION!!!!
Never connect two actuators to the same terminal block
.
No external controls are provided with standard Failsafe units. All manual switch/controls are to
be provided by the customer, and should be connected according to the electrical drawing, or
drawings provided with the Failsafe unit and the switch/control manufacturer. Wiring must
comply with all Federal, State, and local codes.
If your Fail-safe unit is controlling a modulating actuator (
4/20 ma signal
), regardless of the
source of the signal, the Failsafe unit will cut the (
4/20 ma signal)
to the actuator and drive it
down to zero (
0 ma ).
This will force the actuator to move to its failsafe position. For this type
of operation the signal wires should be connected as follows:
1. - Connect the negative
(-)
wire from the 4 /20 ma source to the terminal labeled signal (-) at
the actuator.
2. - Connect the positive
(+)
wire from the 4 / 20 ma source to one of the terminals labeled
MOD
in the Failsafe unit.
3. - Connect the other terminal labeled
MOD
at the Failsafe unit, to the terminal labeled signal
(+)
in the actuator.
4. - Connect the normally open Limit Switch wires from the Actuator to the terminals labeled
ALS
in the Failsafe unit
5. - Connect the motor from the Actuator to the Failsafe according to the drawings supplied with
the unit.
6. - Connect Power to the unit, make sure you connect a solid ground to the Failsafe
7. - Install the Fuses; (they were shipped separately for security reasons.)
WARNING !
Valcom does not recommend the use of any of its Failsafe units in life support systems or in
any life threatening applications where a malfunction or failure of the unit could cause
failure of these applications.
