Experiencing issues with the operation of the G6BK-1114P-US-DC5 Latching Relay?

If you are experiencing any abnormalities in the operation of the G6BK-1114P-US-DC5 relay, please refer to the recommended operation method given below by Omron Electronics

G6BK-1114P-US-DC5 is a latching relay, and 2 clicks implies that it may not be achieving a latch or it’s not starting out in the ‘reset’ position. These relays are shipped in the Reset position, that may change during shipping / handling, so Omron recommends that a reset pulse is sent at the beginning of operation within applications.

First, to ensure a good latch for either set or reset, their pulse width should be at least 15 mS minimum @ 23C.

Then if the temperature has damaged the coil wire insulation, shorting out the coil windings, a latch likely won’t be achieved even if they’re starting out in the reset position and if their pulse width is 15 mS minimum at 23C with nominal voltage of 5VDC used for the pulse.

To check for a latch, you will need to measure the contact resistance after each set / reset latch with bringing the contacts together. The 4-wire method / fall of voltage potential method or a Milliohm meter with Kelvin leads should be used, and not just an Ohmmeter with standard probes.

You can try the following, while measuring the contact resistance (using the correct method).

  1. Apply a reset pulse - - - make sure that the contacts have latched in the ‘off’ (open) position. (Infinite CR….contacts aren’t touching)

  2. Apply the 5VDC, 15 mS set pulse - - - measure contact resistance using the 4-wire method (etc.)

(A) If the relays haven’t switched a significant load for an extended period of time, then using Omron’s method of measurement, the CR should be close to or below our max initial CR rating. And the likely culprit is that the relays weren’t in the starting reset position, and they may have already been in the set position when the set signal was applied

(B) If, however, you hear the two clicks after ensuring a reset condition and the latch hasn’t occurred when applying a correct set pulse then the coil windings may be damaged.

If you try to measure Contact Resistance while it’s on the PCB then the switched load / additional circuitry that’s connected to the closed contacts will likely affect the CR measurements. It’s like having that load / circuitry placed in parallel with a really small resistor so they won’t be measuring the CR, exactly.

You can also double-check to make sure that they’re applying the set / reset pulse to the correct terminals, with the correct polarity.

**In the drawing, (+) and (-) indicators in parenthesis are for the G6KB-1114P-1-US version with reverse polarity.

Second, an incorrect Solder Profile (too hot…. too long…. etc.) can affect the coil windings (degrading the coil wire isolation, shorting out windings) or it can affect the epoxy seal at the base of the terminals / base of the relay.
If the seal is compromised, then internal contamination can occur after conformal coating, board washing, etc. Water entering the relay can corrode the internal moving parts including the spring and armature preventing correct operation. Conformal coating can do the same thing, if acting like a ‘glue’ when it dries. Or if it is uncured inside of the relay it can contaminate the surface of the contacts, dramatically increasing the Contact Resistance.

Here is the list of recommended tip temperature and time. Based on the solder profile, you may be using a temperature that is too high, which could be causing internal damage

Safety Precautions for All Relays: CSM_PCB_RY_CN_E_1_2 (omron.com)

Applicable Parts No

G6BK-1114P-1-US DC5