Steffes 8188 - Manual (Page 25)

TIME CLOCK MODULE PEAK CONTROL
The Steffes Time Clock Module is another option for providing a peak control signal to the system. The optional
time clock module mounts inside the line voltage electrical compartment and interfaces with the relay board via an
interface cable. Peak control times MUST be programmed into the system once the module is installed to enable
the time clock feature. Refer to the instructions provided with the time clock module for more information on the
installation and operation of this device.
POWER LINE CARRIER (PLC) PEAK CONTROL
Power Line Carrier (PLC) control is only available in 208/240V applications.
The Steffes Power Line Carrier (PLC) control system has the ability to communicate with the system through the
existing electrical circuits in the structure. With the power line carrier option, direct wired low voltage connections
from the power company's peak signaling switch connect directly to the transmitting device. The switch signals
peak control times to the transmitter, the transmitter sends the signals to the system, which receives this informa-
tion and responds accordingly.
In addition to providing peak control signals, the transmitter also provides outdoor temperature information for
automatic charge control, room temperature set back, and anticipated peak utility control signals (if applicable).
The PLC system is optional and must be ordered separately. If utilizing a PLC system, an Owner's and Installer's
manual will accompany the transmitting device. Refer to this manual for information on the installation and
operation of the power line carrier control system.
4-20 MILLIAMP CONTROL (1-5 VOLT DC)
The ThermElect system receives a signal from an external load
control device such as a building load management system. This
external signal dictates to the ThermElect the maximum amount of
energy which can be consumed during a preset time interval. This
value is recalculated automatically every 15 minutes.
To enable the 4-20 milliamp control, the one (1) bit must be added to
the current value of Location 53 (L053). Once enabled, the
ThermElect system will continually monitor the current loop input and
randomly shed elements as needed to remain within the maximum
load desired by the load management system. Elements will be shed
from the hottest core first.
The building’s load management system is connected to the
ThermElect system with low voltage wire. The wires are routed into
the electrical panel and connected to the terminals for 4-20ma on the
relay driver board (Figure 21).
Other external loads are generally controlled through the building’s
load management control system.
Relay Driver Control Board
4-20 MILLI-AMP OR PULSE
MONITORING CONNECTIONS
FIGURE 21
Not
Used Sensor
Duct
Duct
4-20ma Pulse
Aux -
+ +
-
-
+
+ -
DownLoad
A/D Status
Status
Core C D E
Core F G H
Duct
4-20ma
24VAC 24VAC
R ight
L im
it
Le
ft
L im
it
Pulse
Connector Download
Pulse
Aux -
+ +
-
Corporation
-
+
R
R
R
R
R
R
Y
Y
Y
Y
Y
Y
Relay Driver
Made In USA
Same Type And Rating Fuse
Against Fire, Replace With
Warning For Continued Protection
Steffes
F
G
H
C
D
E
+ -
+5V
20V 20V
20V 20V S
S H
G
F
C
D
E
AUX L AUX R
T HERM E LECT L OAD M ANAGEMENT
„
4.02
Load Management