Application Engineering
B U L L E T I N
AE8-1386 R1
Keyboard Locking
How to Lock the Keyboard
1. Keep the and keys pressed
together for more than 3s.
2. The “POF” message will be displayed and
the keyboard is locked. At this point it is only
possible to view the set point and INFO menu
and enter the parameter list.
To Unlock the Keyboard
Keep the and keys pressed together
for more than 3s till the “POn” flashing
message appears.
Parameters
The XC643CX is pre-set to drive a Copeland Digital
compressor. The relay 15-17 is set to manage the
compressor contactor, while the TRIAC output 17-19
drives the digital solenoid valve.
oA2 (terminal 16-17) output 2 configuration:
Second relay according to the configuration of the
oA2 parameter can work as:
- Compressor: oA2 = cPr,
- Not used: oA2 = nu
oA3 (term. 17-18) output 3 configuration: third
relay according to the configuration of the oA3
parameter can work as:
- Fan: oA3 = FAn,
- Not used: oA3 = nu
oA4 (term. 17-20) output 4 configuration: fourth
relay according to the configuration of the oA4
parameter can work as:
- Fan: oA4 =FAn,
- Not used: oA4 = nu
Compressor Regulation
Pbd: Proportional band or neutral zone width
(0.1-5.0bar/0.5-30°C or 1-150PSI/1-50°F) The
band (or zone) is symmetrical compared to
the target set point, with extremes: set-Pbd/2
- set+Pbd/2. It is used as proportional band
for PI algorithm.
The measurement unit depends on the dEU,
CF, PMU parameters.
inC: Integration time: (0 - 999s) PI integration time
tdS: Digital cycle time: (10-40s) it sets the cycle
time for the digital valve modulation. 15-20
seconds is the recommended Digital cycle time.
20 seconds is the default setting.
don: Time delay between the insertion of second
compressor (0-99.5min; res. 10s).
Triac
0,5A250V
!!!WARNING: Digital unloader
operate at main voltage (230Vac or 115Vac)!!!!
NOTE: Main voltage side (6PINs connector): the PIN
17 is the common line for all the relay outputs and for the
TRIAC.
Triac is internal to the XC643CX controller.
15 16 17 18 19 20
5AMax
DGS
Main voltage
DGS
Cp2 FAN1
Valve
FAN2
230V or 120V
Figure 7 - Relays in XC643
© 2013 Emerson Climate Technologies, Inc.
13
Printed in the U.S.A.
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