VDO 170.Timer is a multi-function timing module that provides volt free normally open and normally closed relay outputs for 12 and 24V circuits.
VDO 170.Timer is a very versatile timer that can be used for many different applications. It requires no special tools so it can be easily setup in the field.
There are 4 time ranges that can be selected by the dip switches, 1 to 30 seconds, 2 to 60 seconds, 1 to 30 minutes or 2 to 60 minutes. The trim pot is then adjusted to the desired timing interval.
The module can be set to be a one-shot device, or continuous cycle of on-off-on-off.
There is also a delay setting to delay the timer after power-up and an inhibit input which stops the timing cycle.
In this example, we have the 170.Timer configured as a glow plug timer.
We have selected instant on. Cycle is set to off, so that the timer only operates once.
Time is set to seconds.
The volt switch is set to the voltage of the engine's electrical system – in this case we are using 12 volts.
The pot has been set at the half way point, which is approximately 15 seconds. In practice this would be set fully clockwise which would be 30 seconds.
The VDO 170.Timer must be connected to the ignition circuit so that as soon as the ignition is turned on, the glow plugs will also be turned on for the predetermined time.
In this example, we have the VDO 170.Timer set up as a turbo timer. Delay is set to instant on. Cycle is set to off. Time is set to around 5 seconds. In practice this time would be set around 5 minutes.
The VDO 170.Timer is powered by the battery and only requires 3.5 milliamps when the engine is not running. This drain is so low that it will not flatten the battery. As a comparison, a single LED requires approximately 10 milliamps.
The ignition wire is disconnected from the key switch and will be powered by a 30 amp relay being controlled by the VDO 170.Timer.
[I think we need to show schematic here]
The inhibit on the VDO 170.Timer is connected to the ignition terminal on the key switch. Connecting a positive voltage to the inhibit connector will reset the timer and hold it in a reset state until the voltage is removed allowing the VDO 170.Timer to go through it’s timing sequence. In operation, when the engine is turned on, the ignition is immediately powered up. However, when it is switched off, the VDO 170.Timer will keep the engine running for a pre-determined time.
The VDO 170.Timer is encased in epoxy, so it is very rugged and shock resistant.
Contact local VDO distributor for more information on the VDO 170.Timer.
