Demand Limit; To 20 Ma; Switch Controlled; Additional Emm Functions - Carrier 30XV140-500 Installation Instructions Manual

Demand Limit

4 TO 20 mA — A field-supplied and generated, externally
powered 4 to 20 mA signal can be used to provide a de-
mand limit signal for chiller capacity reduction. The signal
must be connected to TB6-1, 2 (positive, negative). A
field-supplied / -watt, 250-ohm resistor must also be con-
1
2
nected across terminals TB6-1,2. See Fig. 4. See the Con-
trols, Start-Up, Operation, Service and Troubleshooting
guide for configuration information.
CAUTION
Care should be taken when interfacing with other control
systems due to possible power supply differences such as a
full wave bridge versus a half wave rectification. Connec-
tion of control devices with different power supplies may
result in permanent damage. ComfortLink controls incor-
porate power supplies with half wave rectification. A sig-
nal isolation device should be utilized if the signal
generator incorporates a full wave bridge rectifier.
SWITCH CONTROLLED — A field-supplied set of dry
contacts can be used to provide up to three steps of chiller ca-
pacity reduction. The three steps are achieved through two
sets of dry contacts. The contacts for Demand Limit Switch 1
must be connected to TB6-5,14 and are on the standard unit.
The contacts for Demand Limit Switch 2 must be connected
to TB6-14,15. See Fig. 4. The position of these contacts will
allow for up to three steps of demand limit according to the
following:
AMOUNT OF CAPACITY REDUCTION
CONTACT
Switch Limit
None
Setpoint 1
Switch 1 Open Close
Switch 2 Open Open
Refer to the Controls, Start-Up, Operation, Service and
Troubleshooting guide for configuration information.

Additional EMM Functions

INPUTS — A field-supplied set of dry contacts can be used to
provide an occupancy override signal (TB6-12,13), remote
chiller lockout (TB6-5,6) or ice done switch (TB6-9,10) to the
controls. See Fig. 4. The occupancy override switch can be
used to put the chiller in an occupied mode during a normally
scheduled unoccupied mode of operation. The remote chiller
lockout function will disable the chiller when closed. With ice
mode configuration enabled and ice done switch contact open,
a brine chiller will be able to operate as desired during off peak
times in conjunction with an ice storage system. Operation in
ice mode ends when the contact closes. Refer to the Controls,
Start-Up, Operation, Service and Troubleshooting guide sup-
plied with the chiller for more information on the correct con-
figuration of these options.
OUTPUTS — One analog and four discrete outputs are
available from the Energy Management Module. The ana-
log output indicates percentage of total capacity with a 0 to
10 vdc signal. Four discrete outputs, Compressor A Run
Status, Compressor B Run Status, alert relay, and shutdown
relay indicate unit operation. All four outputs are to assist
with remote monitoring of chiller operation.
EMM-J3 Connection — To utilize this connection, field-
supplied wiring should be connected to TB6-20, 26 for shut-
down relay (SHDR) and TB6-18, 26 for alert relay (ALT R).
See Fig. 5.
Switch Limit Switch Limit
Setpoint 2 Setpoint 3
Open Close
Close Close
EMM J3
Fig. 5 — 30XV Shutdown and
Alert Relay Wiring
Shutdown Relay — This feature provides an output signal
whenever the unit is in an alarm condition and at 0% capac-
ity. The maximum load for this relay is 10 VA sealed, 25 VA
inrush at 24 vac. For connection information, see the EMM-
J3 Connection section.
Alert Relay — This feature provides an output signal to indi-
cate that at least 1 circuit is off due to an alert. The maximum
load for this relay is 10 VA sealed, 25 VA inrush at 24 vac. For
connection information, see the EMM-J3 Connection section.
Compressor Run Status — This feature provides outputs to in-
dicate run status of each compressor. The maximum load for
this relay is 10 VA sealed, 25 VA inrush at 24 vac. Connections
are made to TB6-24 and 25 for compressor A and TB6-22 and
23 for compressor B. See Fig. 6.
EMM J2A
Fig. 6 — 30XV Compressor Run Status
Percent Total Capacity —This feature allows the unit control
to provide a 0 to 10 vdc signal based on the unit capacity. The
signal is a linear function from 0 to 10 vdc, with 0 vdc repre-
senting 0% capacity and 10 vdc representing 100% capacity.
See Fig. 7 for wiring. Field wiring connections are made to ter-
minal TB6-16, 17.
EMM
J8
Fig. 7 — 0 to 10 vdc % Total Capacity Wiring
6
TB6
COMP
25
8 A
TB6
24
7
TB6
COMP
23
6
B
TB6
22
5