Rthd Chillers; Check Out Procedure For Rthd; Potential Transformer - Trane RTHD Troubleshooting Manual

RTHD Chillers

Check out procedure for RTHD

WARNING
Live Electrical
Components!
Potential
Transformer
RLC-SVD05A-EN
Over/Under Voltage
across the secondary. Measuring the voltage across the 1000 Ohm resistor
should yield a voltage ratio of 20 to 1. Deviations of more than ±2% suggests a
bad transformer. If the 1000 Ohm loaded ratio is within tolerance, but the
Main Processor connected ratio is out of tolerance, suspect a bad Starter
Module. Before replacing the Starter module, double check the Unit Line
Voltage programed in the Main Processor. It should match the nameplate unit
line voltage.
5 If the Under/Over Voltage Protection continues to call out a diagnostic and all
of the above measured ratios are within tolerance, and all Main Processor
Under/Over Voltage settings have been verified, replace the Starter module.
CH530 will monitor all three line-to-line voltages for the chiller, Vab, Vbc and Vca.
Both the over and the under voltage diagnostics will be based on the average of
the three voltages. The transformers will display of the magnitude of these
voltages as well as under and over voltage protection, if such is enabled.
During installation, testing, servicing and troubleshooting of this product, it may
be necessary to work with live electrical components. Have a qualified licensed
electrician or other individual who has been properly trained in handling live
electrical components perform these tasks. Failure to follow all electrical safety
precautions when exposed to live electrical components could result in death or
serious injury.
The following table shows the conversion of input voltages as measured at the
voltage inputs of the Starter module to the incoming line-to-line voltage the
transformers are connected to. The potential transformer has a turn's ratio of
600:30.
Table 6. Starter Module Input-to-Line Voltage Conversion
Starter Module Input Voltage
J5-1,2
J5-3,4
J5-5,6
(Volt AC)
9.4
9.9
10.4
10.9
11.4
11.9
12.4
12.9
13.4
13.9
Incoming Line-to-Line Voltage
(Volt AC)
190
200
210
220
230
240
250
260
270
280
31