Unit Controls And Sequence Of Operation - Trane RSDH0012 Manual

Unit Controls and Sequence of Operation

1 - Customer Interface
1. Sequence is as follows:
a. "AUTO / OFF / MANUAL" selector switch is
provided for starting the system in the Auto mode
by interfacing with the customer supplied
equipment. A contact closure via the "ON/OFF"
selector switch between TB06#61 and TB06#I0.1
will let the system start in auto mode. The MANUAL
mode does not require the dry contact closure input
to enable the system to start. The selector switch
has an integral light and will stay illuminated at all
times to indicate the equipment has power.
2 - Auxiliary Dry Contacts
1. Operational System States
a. SYSTEM FAULT: Auxiliary dry contacts of CR02 are
provided for customer interlocking and shall close
whenever the dehumidifier goes into any fault as
described in Section 6.
b. SYSTEM RUN (MASTER CONTROL RELAY):
Auxiliary dry contacts of MS03 are provided for
customer interlocking and shall close whenever the
process blower is in operation.
c. SYSTEM WARNING: Auxiliary dry contacts of CR03
are provided for customer interlocking and shall
close whenever the dehumidifier goes into a
warning condition.
d. D/H RUN: Auxiliary dry contacts of MS02 are
provided for customer interlocking and shall close
whenever the dehumidifier is in operation.
3 - Start-up
1. Main Power Initialization Sequence:
a. Energize the main power to the equipment by
supplying correct voltage directly to the unit by
using the system's main fused disconnect. (The
selector switch will illuminate indicating the
equipment is energized.)
b. The equipment's high voltage is supplied to all
motor starters and the control transformer(s). The
control voltage (115V/1Ø/60Hz) is now being
supplied to the control circuits.
c. The HMI LCD, located on or in (visible through the
door) the Main control enclosure is energized and
will display the "System Screen" (Figure 2).
d. There is a 10 sec delay in the equipment startup of
the system once power is activated via the selector
switch.
SRV-SVX04B-EN
Figure 2.
2. Startup:
a. Normal startup operation shall occur once the main
selector switch (SS01) is placed in the MANUAL or
in AUTO position with a customer-supplied
auxiliary interlock (dry-contact) closed between
TB06#61 and TB06#I0.2.
4 - Shutdown
1. Normal Shutdown
A Shutdown shall occur with the following.
a. Selector Switch (SS01) is maintained in the OFF
position.
b. Selector Switch (SS01) is maintained in Auto
position with a contact opening across TB06 # 61
and TB06 # I0.2.
c. A fault has occurred.
2. Sequence of Normal Shutdown
a. The reactivation control Proportional Control Loop,
and associated fault circuits are de-energized.
b. The process control loops are de-energized (section
6).
c. A purge timer in the (PLC1) is a delay time with a
fixed on time of three (3) minutes. This allows the
air to continue to cool the desiccant wheel. When
the timer has completed its count cycle, the
desiccant wheel drive motor (MTR1), the
reactivation blower motor (MTR2), and supply
blower motor (MTR3-optional) are all de-energized.
NOTICE
Improper Shutdown!
Improperly shutting down equipment could cause
equipment-only damage.
Do not shut down unit by de-energizing main power
prior to completion of purge cycle. (Wait for
"PURGING" to change to either "STANDBY" or
"READY" before de-energizing main power.).
5 - Faults & Warnings
Note: ESC or Help button may be pressed twice quickly to
exit back to the system screen at any time during
screen navigation.
1. Alarm Indication
9