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Product Description
Motor Protection Module
The mechanical motor protector is a Texas Instruments
2ACE Three Phase Protection Module (Fig. 45, page
125) thermal and current motor overload protection.
This module protects against phase to phase current im-
balance, over current, under current, and phase rotation.
The module, mounted in the power panel, utilizes a 7
segment display which provides operating status and
fault diagnostic information. The 7 segment display will
display either a stationary or a flashing alphanumeric
value which can be decoded by the operator. A list of
the codes follows:
HAXXX
Normal motor OFF display. Sequentially
sweeps through the motor protection dip
switch setting.
0
Normal - no fault detected (Running)
Flashing "0"
Motor off or unloaded < 5A (Running)
AC current level.
1
High current fault.
2
Loaded phase to phase current
imbalance > 17%.
3
Unloaded phase to phase current
imbalance > 25%.
4
Improper incoming phase rotation.
5
High motor temperature. Trip point =
13kW, reset = 3.25kW.
6
Communication error.
7
Unload imbalance ( > 50%)
8
Phase Loss (> 60%)
E
Out of range of RLA calibration.
Other symbols Defective module or supply voltage.
Working voltage 18 - 30 VAC, 224 VAC nominal.
Low voltage trip = 15 VAC.
Whenever a motor protector trips, the motor protector
contacts wired in series with the motor contacts opens
and the motor contactor de-energizes allowing the
motor to stop. The micro senses the low motor current
and shuts the system down. The micro will try two
more starts before locking the system out. The system
locks out because the motor protector is a manual
reset device. After the first start the modules' contacts
JOHNSON CONTROLS
will be open preventing the motor contactors from
energizing. Power must be removed and re applied to
reset the module.
Current Overload
The 2ACE module design uses one integral current
transformer per phase to provide protection against
rapid current overload conditions. The module responds
to changes in current and must be calibrated using DIP
switches located on the module. Integral trip curves
allow for in-rush currents during Wye-Delta, part wind,
or ACL starts without nuisance tripping.
To check the factory setting of the 2ACE module current
overload trip value. See Table 1 (pages 20 and 21).
For the location of the dip switches and determining the
ON position refer to the "Note" below and Figure 45.
For the location of the dip switches and determining the
ON side of the switches, refer to Figure 45, page 125. As
indicated, to place a switch in the ON position requires
pushing the switch to the left.
A switch must be pushed to the left to
place the switch in the ON position.
It is recommended that an YORK
Service Technician or the YORK
factory be consulted before changing
these settings for any reason, since
damage to the compressor could re‑
sult. Changes should never be made
unless it is verified that the settings
are incorrect.
Anytime a dip switch change is made,
power must be cycled off and on to the
module to reprogram the module to the
new valve.
FORM 201.18-NM7
19
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