Electrical controls
Ensure electrical connections are tight and connectors are secure annually.
It is important that the factory settings of controls (operation and safety) not be changed. If the
settings are changed without Johnson Controls approval, the warranty will be jeopardized.
Automatic battery health test – during shutdown
For periodic maintenance or to diagnose battery faults or warnings, a battery health test can be
performed. This test is initiated from the Power Panel screen of the OptiView panel to monitor
battery voltage while under a known load. This will ensure that the battery has enough capacity left
to withstand a power failure event. The test is available though operator access level or higher.
At the keypad, log in at Operator access level using access level code 9 6 7 5 or a higher level.
Navigate to Compressor – Power Panel screen.
On the Power Panel screen, the Start Battery Test button is shown and the function available when
all of the following are true:
• Access Level is Operator or higher
• Chiller State is Stopped
• Safety Stop push-button is depressed
• The Local Run/Stop is set to Stop
When the Start Battery Test button is pressed the Battery Health Test is initiated. When the Battery
Health Test is in progress, this button changes to a Cancel Battery Test button to cancel the active
Battery Health Test in progress if needed. The test proceeds as follows:
The panel instructs UPS Battery Test - Disconnect 3-phase line power to the
chiller now. At that time, remove three-phase power to the chiller. Once the power is removed,
the UPS becomes available for a limit of 10 minutes for performance of the test.
When the panel detects control voltage is low and UPS is in Inverter mode due to loss of the
line power, the panel displays UPS Battery Test - Evaluating Battery. The MBC is then
commanded to Levitation. After the MBC reports to OptiView that it is in Levitation mode, the
battery voltage is monitored for the next 60 seconds.
The following constitute a fail result:
• If Battery Voltage drops to less than the Inverter Low Battery Voltage Threshold (Default 11.0
V) (UPS – Inverter Low Battery Voltage fault threshold) the test fails and ends
• If the test takes longer than 75 seconds the test fails and ends
• If the UPS shuts down (OptiView will lose power) due to voltage, fuses, disconnect, or any
other reason the test fails and the OptiView displays a fault on next power up stating that the
battery health test has failed. This fault can be cleared by running a successful battery health
test
If the “UPS – Inverter Low Battery Voltage” fault is not set by the end of the 60 second test (Battery
Voltage stays above the threshold), the battery evaluation is considered good.
Next, the control ceases MBC levitation. If this step takes longer than 15 seconds, the test fails and
ends.
Then the panel instructs Reconnect 3-phase line power to the chiller now. At that time,
reapply three-phase power to the chiller. The full test successfully ends when OptiView detects the
control voltage has returned.
YMC
2
Mod B with OptiView
™
Control Center
168
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