Trane RTHA Installation, Operation And Maintenance Manual page 39

level until either the motor reaches full speed, the UTS
timer expires, or the motor thermal overload trips.
Note: Units built in Pueblo should not exceed 3 seconds.
Setting the ramp time to a specific value does not
necessarily mean that the motor will take this time
to accelerate to full speed. The motor and load may
achieve full speed before the ramp time expires if
the application does not require the set ramp time
and maximum current to reach full speed.
Alternatively, the motor and load may take longer
than the set ramp time to achieve full speed.
P4 Rated RMS Voltage
The Rated Voltage parameter sets the line voltage that is
used when the starter performs Over and Under line
voltage calculations. This value is the supply voltage; NOT
the motor utilization voltage.
P5 CT Ratio
The CT ratio must be set to match the CTs (current
transformers) supplied with the starter. This allows the
starter to properly calculate the current supplied to the
motor.
Only Benshaw supplied CTs can be used on the starter.
The CTs are custom 0.2 amp secondary CTs specifically
designed for use on the MX starter. The CT ratio is then
normalized to a 1A secondary value. The supplied CT ratio
can be confirmed by reading the part number on the CT
label. The part number is of the form BICTxxx1M, where
xxx is the CT primary and the 1 indicates the normalized 1
amp.
Note: See "Current Transformer Set-up (MX Only)," p.
P6 Software Part Number
The software part number is useful for future service
reasons. If calling Benshaw for service, this number
Table 1. Parameter settings MX/MX2 — Trane ONLY software
Parameter Description
P1 Motor FLA
P2 Maximum Motor Current
P3 Ramp Time
P4 Rated RMS Voltage
P5 CT Ratio (x:1)
P6 Software Part Number
P7 Passcode
P8 Fault Log
RLC-SVN005B-EN
should be recorded so it can be provided to the service
technician.
On power up with an LED display, the software version is
flashed one character at a time on the least significant
digit. With an LCD display, the software PN is fully
displayed on power up.
P7 Passcode
The MX control supports a 4-digit passcode. When the
passcode is set, parameters may not be changed.
When a passcode is set and an attempt is made to change
a parameter through the display/keypad, the UP and
DOWN keys will simply have no effect. When a passcode
is set and an attempt is made to change a parameter
through Modbus, the control will return an error response
with an exception code of 03 (Illegal Data Value) to indicate
that the register may not be changed.
P8 Fault Log
When a fault occurs, the fault number is logged in non-
volatile memory. The most recent fault will be in FL1
location and the oldest fault will be in FL9.
See "Troubleshooting," p. 44
Appendix for the fault codes and their descriptions.
Parameter Settings
Important:
40.
Setting Range
1-6400
100-800
0-300
200, 208, 220, 230, 240, 350, 380,
400, 415, 440, 460, 480, 500, 525, 575, 600
2640, 5760
Display only
0-9999
Display faults stored in Fault log
Quick Start, Initial Parameters
or RTHD-SVD02*-EN
Information in Table 1 is parameter setting
for Benshaw Trane ONLY software. These
are NOT the STANDARD MX2 parameter
settings.
Units
A
rms
%FLA
Sec
V
rms
-
-
-
-
Default
10
260
1
480
2640
-
-
-
39