Toa FS-970 SERIES - Manual (Page 45)

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13. CONNECTION INSPECTION
13.1. Inspection of Connections and Wiring
• After all connections are completed, inspect the connections and wiring again before turning on the AC
breaker of Junction Panel JP-0410.
• Ensure that cables are correctly connected between components. Also, check external wiring for connection
errors and wiring omissions.
13.2. Adjustment and Measurement of Power Circuitry
13.2.1. AC line insulation measurement (using megger)
Disconnect the power cable connection to measure the insulation between the following items.
(1) Between the ground and one line (Between G and L1) : Over 0.1 M
Ω
(2) Between ground and another line (Between G and L2) : Over 0.1 M
Ω
(3) Between lines (Between L1 and L2) : Over 0.1 M Ω
When lowering 0.1 M
Ω, check for flaws on cable sheath, defective taping in the joint box, and any leakage into
pipes. If such problems are found, repair immediately.
13.2.2. Power voltage measurement (using tester)
Measure voltage between lines. Normally, it must be within the range between –5% and +10% of nominal
voltage.
• When lowering –5% of nominal voltage, the power capacity is insufficient. Inspect and adjust the receiving
system.
• When exceeding +10% of nominal voltage, adjust the receiving facilities to prevent equipment burning.