56 RTAD-SVX01F-E4
Installation - Electrical
Minimum setpoint: 40% (2.0 V
(dc)input)
Maximum setpoint: 120% (10.0 V
(dc)input)
4-20 mA Current source input
Set dipswitch SW1-2 of the option
module A9 to "ON." Connect the
current source to terminal 7 (+) and
8 (-) of option module A9. CLS is
now based on the following
equation:
CLS % = (mA * 5) + 20
Sample values for CLS versus mA
signals are shown in Table 29.
Minimum setpoint = 40% (4.0 mA)
Maximum setpoint = 120% (20.0 mA)
Table 37 - Input values vs. external
current-limit setpoint
2.0 4.0 40
3.0 6.0 50
4.0 8.0 60
5.0 10.0 70
6.0 12.0 80
7. 0 14.0 90
8.0 16.0 100
9.0 18.0 110
10.0 20.0 120
Outdoor air-temperature
sensor
This sensor is used for low ambient
lockout and chilled-water reset by
outdoor air temperature. This sensor
is optional on the RTAD units.
Remove the sensor from its shipping
location in the control panel and
install it in the fresh-air intake on the
north wall of the building. Protect
the sensor from direct sunlight and
shelter it from the elements. Connect
leads to terminals 1 and 2 from
module A9 TB1. All wiring to and
from the remote sensor must be
made with shielded, twisted-pair
conductors.
Be sure to ground the shielding only
at the UCM-CLD. Apply tape to the
sensor end of the shielding to
prevent it from contacting the
surface.
WARNING! To prevent injury or
death, disconnect the electrical
power source before completing
wiring connections to the unit.
Note: Not available for Free-Cooling
units.
External current limit
setpoint: voltage source
2-10 V (dc) or current
source 4-20 mA.
This option allows the external
setting of the current limit setpoint
(CLS), independent of the front panel
current-limit setpoint, by one of the
two means:
1 - an isolated voltage input 2-10 V
(dc)
2 - an isolated voltage input 4-20 mA
To enable external current-limit
setpoint operation, external current-
limit setpoint (operator setting
menu) should be set to "E" using the
clear language display.
1- 2-10 V (dc) voltage source input
Set dipswitch SW1-2 of the option
module A9 to "OFF."
Connect the voltage source to
terminals 7 (+) and 8 (-) of the option
module A9. CLS is now based on the
following equation:
CLS % = (V (dc)*10) + 20
Sample values for CLS vs.
V(dc)signals are shown in Table 33.
Resulting
chilled-water
setpoint (°C)
Voltage
(V (dc))
Current
(mA)
To Next Page
Loading...
Need help?
General
