Light Relay Configuration (Par Oa3; Term. 1-4); Light Relay; Auxiliary Relay - Oa3=Aus; On/Off Relay - Oa3=Onf - Emerson XR75CX Installation And Operation Manual

3.4. Light Relay

Configuration (PAR
oA3; TERM. 1-4)
The functioning of the auxiliary relay (terminals
1-4) can be set by the oA3 parameter, according to the
kind of application needed. Possible settings are as
follows:
3.4.1. Light Relay
When oA3 = Lig the relay 1-4 operates as a light.
3.4.2. Auxiliary Relay — oA3=AUS
a. Relay Activation By Digital Input 2 (oA3 =
AUS, i2F = AUS)
When oA3 = AUS and i2F = AUS the relay 1-4 is
switched ON and OFF by the digital input.
b. Auxiliary Thermostat
An anti-condensing heater with the possibility of
switching it ON and OFF with the keyboard.
Parameters Involved
• ACH The kind of regulation for the auxiliary relay:
Ht: heating; CL: cooling
• Setpoint for auxiliary relay
SAA
• SHy Differential for auxiliary relay
• ArP Probe for auxiliary relay
• Sdd Auxiliary output OFF during defrost
The functioning of the auxiliary relay can be set
with these five parameters. The differential is given
by the SHy parameter.
NOTE: Set oA3 =AUS and ArP= nP (no probe
for auxiliary output). In this case the relay 1-4
can be activated only by the digital input with
i1F or i2F = AUS.
3.4.3. On/Off Relay — oA3=onF
In this case the relay is activated when the control-
ler is turned ON and de-activated when the controller
is turned OFF.

3.4.4. Neutral Zone Regulation

When oA3 = db the relay 1-4 can control a heater
element to perform a neutral zone action.
oA3 cut in = SEt-Hy

Light Relay Configuration (PAR oA3; TERM. 1-4)

oA3 cut out = SEt

3.4.5. Alarm Relay

When oA3 = ALr relay 1-4 operates as an alarm
relay. It is activated every time an alarm occurs. Its
status depends on the tbA parameter: if tbA = y, the
relay is silenced by pressing any key. If tbA = n, the
alarm relay remains ON until the alarm condition re-
covers.
3.4.6. Night Blind Management Dur-
ing Energy Saving Cycles
With oA3 = HES, the relay 1-4 operates to man-
age the night blind: the relay is powered when the en-
ergy saving cycle is activated, by digital input, front
panel, or RTC (optional).
Controlling Loads • 3