iNS3/iDS3/iN3 3-Wire System Troubleshooting

Flash Patterns of Button's LED

• Button Searching for iPHCU3W/S or iCCU
• Buttons will only look for the iPHCU3 DATA signal for a short time after powerup, then it will transition to search for the iCCU - once in this mode, it will not check the DATA line voltage again. Even if the DATA signal voltage is corrected, the button may remain in 2-Flash until a power cycle is performed.

• Button Performing POST (Power On Self-Test)
• Button should only be in POST for a short duration after powerup.
• Button in Maintenance Mode (Audio Playback Enabled)
• Audio Playback Enabled (PBS Configuration > Settings)
• FW Update initiated

• BLE Connection established
• Attempted connection to the button via an app
• Flash LED Initiated
• Flash LED command is sent by the user

1. Ensure the only connections used for inputs on the iPHCU3S/W are the 3 wires specified (DW_IN, WK_IN, and ACN). The 4th terminal is not required and may be disconnected.
1. There should only be voltage on the input that is active:
1. During Don't Walk: ~120VAC on DW_IN during Don't Walk, 0VAC on WK_IN for full duration
2. During Walk: ~120VAC on WK_IN during WALK, 0VAC on DW_IN for full duration
3. During Countdown/Clearance: Alternates between ~120VAC for .5 seconds and 0VAC for .5 seconds on DW_IN, 0VAC on WK_IN for full duration

2. Check Firmware, if the firmware is older than 4.12(iNav)/4.0.12(iNS/iDS), perform a firmware update on the button (using a smart phone or PC app).

3. If the firmware upgrade does not correct the issue, on some early model units, the green terminal blocks had zinc plated screws instead of brass screws. In areas where salt, or other chemicals are put on roads, we have seen an acceleration of corrosion on the power/right terminal screw of the green terminal block. Rust (orange corrosion) forms and causes conductivity across the pins (of the green terminal block), which can cause a constant call. Polara is replacing under warranty any units that exhibit rust on the right power terminal of the green terminal block. Contact your distributor for an advance replacement and RMA the unit.

4. If there is no rust/corrosion as described in step #3 above, measure for voltage across the two BUTTON terminals (black terminal block). You should see 8-24 VAC or VDC. If it measures 0V, or significantly different from 8-24 VAC or VDC, disconnect the wires and measure across them. If you still see 0V, and there are other buttons on the same phase with their LED on, disconnect all of their 2-position black terminal block wires, and as you disconnect each observe if the constant call drops. If you find upon disconnecting a specific button the constant call drop, leave it disconnected and reconnect all other buttons, and verify the constant call remains dropped. On the unit that dropped the call when disconnected, measure for voltage across the button wires. If voltage does not appear on the button wires, there is a problem with the field wires (broken or pinched/shorted to ground). If you see 8-24 VAC or VDC across the wires of the button that stopped the constant call upon disconnection, disconnect wires to green terminal block and verify you get 24 VDC between 1-2, and 2-3 (per figure at beginning of this document). If you see 24 VDC for both, there is something wrong with the button and it should be RMAd.

5. If you do see 8-24 VAC or VDC across the terminals of the black terminal block, verify the PED Walk and Don’t Walk lights in the PED Head associated with the button are operating correctly. If they are not, fix the PED Head unit and ensure 120 VAC is going to the button’s PED Head Control Unit in the PED Head. If the lights are operating correctly, measure for voltage between the screws of the green terminal block.
6. If Polara’s 3 wire cable was used and installed per our Installation Manual, a black wire is the power conductor, a white wire is common, and a red wire is the data line. Across the black and white wire terminal screws you should see approximately 24 VDC. Across the white and red wire, you should see approximately 1.35 VDC during Don’t Walk, and approximately 2.1 VDC during Walk. If you do not see voltages close to these numbers, remove the wires from the green terminal block (noting which color goes to which terminal), and be careful to not short them together. Measure again between the black and white wires. If you do not see 24 VDC, open the PED Head and verify 120 VAC is being supplied to the input terminal block of the Control Unit during Walk and Don’t Walk. If 120 VAC is present during Walk and Don’t Walk, verify 24 VDC is present for power and data on the output terminal block of the PED Head Control Unit. If the proper voltages are present at the output terminal block, then there has to be a problem with the wires going down to the button, or the wires were not making good contact in the green terminal block. If the proper voltages are not present at the output terminal block, the Control Unit should be RMA’d. When a button does not see the proper voltages from the PED Head Control Unit, it locks in a call across the black terminal block.

6. If a constant call occurs during initial installation following connection of the second or third button on a crosswalk, it can be because the PED Isolator circuit in the cabinet is overly sensitive. The solution is to install a relay between the field wires and PED Input, or solder a resistor across certain terminals of the PED Isolator card. Contact Polara’s Tech Support for more information if you feel this may be the case.

7. Note: If buttons are set up for Wireless Sync and one of the buttons develops a constant call, both will exhibit a latched LED. You would need to disable Wireless Sync to properly troubleshoot the buttons.