Ensure Pin 3 (Signal) is receiving the correct voltage. Most units require a high signal to trigger the timer.
Use the integrated mounting slots on the heavy-duty aluminum baseplate. Secure the unit using M5 or #10 screws. Do not overtighten, as cracking the housing will compromise environmental sealing.
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Understanding the Curtis 3501 Series Digital Hour Meter: Precision, Durability, and Application Guide Ensure Pin 3 (Signal) is receiving the correct voltage
The Curtis 3501 manual covers a wide range of topics, including:
Turn the key on and measure the voltage at the KSI terminal relative to B-. It must read full battery voltage. If it reads 0V, inspect your key switch, fuse, or interlock switches. Step 3: Test Throttle Signal Secure the unit using M5 or #10 screws
Digital logic input that dictates reverse directional travel when connected to B+.
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Display blank | No power / reversed polarity | Check voltage at terminals 1–2 | | Display frozen | Electrical noise or damaged unit | Isolate from contactors; replace if needed | | Erratic counting | Input voltage below minimum | Verify supply meets manual’s spec | | Segments missing | LCD damage from impact or over-voltage | Replace meter |