Powermite 599 MZ Series SSB Electronic Valve Actuator Technical Instructions
24 Vac 3-position Control Document No. 155-195P25
December 18, 2003
Operation
A 24 Vac control signal to the Y1 extends the actuator output shaft.
A 24 Vac control signal to the Y2 retracts the actuator output shaft.
The stroke travel is proportional to the length of time the signal is applied. With no
control voltage or in the event of a power failure, the actuator maintains its last position.
NOTE: Do not attempt to operate an actuator if it is not attached to a valve. In this
situation, the actuator will only respond to a signal on terminal Y1, and drive to
the full stroke position. It will then hold at the full stroke position.
Only by attaching the actuator to a valve, or by manually depressing the
actuator stem to engage an internal micro-switch, will the actuator respond to
a signal on terminal Y2.
Mounting and
Installation
EA0849R2
Figure 4. Mounting Position.
Mount the actuator in one of the allowable positions shown in Figure 4.
When mounting the actuator in a plenum, the proper cable must be attached to meet
local codes.
Allow 8 inches (200 mm) above the actuator and 8 inches (200 mm) behind the cable
for service.
Installation Instructions are included with the actuator.
Wiring
Do not use autotransformers. Use earth ground isolating step-down Class 2 power
supplies.
Determine supply transformer rating by summing total VA of all actuators used.
It is recommended that one transformer power no more than 10 actuators.
See Table 1 for terminal connections.
NEUT
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
Y2
Y1
G
24
Vac
EA0585R1
Figure 5. Terminal Connections of the SSB81U.
1
0
Siemens Building Technologies, Inc. Page 3
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