407QHM - Quad High Amp Module


The 407QHM is a 4 channel digital I/O module. The module has 4 channels which can be independently configured as digital inputs or digital outputs. Channels 1 and 2 can be configured as dimmable outputs, channels 3 and 4 are high power channels capable of sourcing twice the current of the other channels. The 407QHM features a manual mode to allow operation of outputs without a functioning E-Plex connection.


Frequently Asked Questions

Why are there nine different E-Logic objects for the 407QHM?

Different objects are used to activate different features of the module. It is important to note that the same hardware is used for all 9 images. The first distinction is to determine whether a given channel is dimmable or not. There are three combinations: no dimmers, channel #1 is dimmable, and channels #1 & #2 are dimmable. The control pins on the left side of the object change for each image. The second distinction determines how much status information is returned from the module. The more information that is returned, the more address space is used by that module. Version A only returns the LED status, which will be on when the channel is on and blink if the channel is in fault. Version B returns the channel feedback status, the fault status, and the switch status independently. Finally, version C returns all that information in addition to the current drawn by each channel.

How does the feedback channel on the 407QHM work?

The feedback channel on the 407QHM indicates if the output is on or not. On dimmed channels, this pin will be true if the dimmer level is greater than 0%. On non-dimmed channels, this pin will be true if voltage is detected on that output. This pin is used when a channel is used as an input. This pin can also be used to check for an open circuit. When open circuit detection is enabled in the 366HMM's Unique Properties, if there is a fault and the feedback is still on, you know it is an open circuit fault.

How does the over current protection work?

The module has two current ratings, the channel rating and the module rating. The channel rating is the maximum current that can be drawn by any given channel. If a channel exceeds this current, that channel is automatically disabled (tripped). To re-enable the channel, it must be switched off then back on from software. This trip current can (and should) be adjusted per channel from the object's unique properties in order to match the rating of the connected load.

The module rating is the maximum current that can be drawn by all channels combined. This is less than the sum of the channel ratings, so it is not possible to have all channels running at full load simultaneously. If this limit is exceeded for more than a short period of time the module will be damaged. It is therefore necessary to protect the module by fitting an appropriately sized fuse/breaker on the input.

The nominal current of my loads is less than the maximum module current, but the total trip current is not. Do I have to split the loads across multiple modules?

Example: you have 6 loads that normally operate at 5 A, and you need a trip current of 10 A. The total trip current is 60 A, which exceeds the 50 A limit of the module.

This is OK, because in practice the total current will only be 30 A. However it is important to remember that the module must be protected by an appropriately sized fuse/breaker on the input.

Why does the module I have received feature an additional connection PCB labelled 810SSS

This unit has been added to the standard module to provide additional features, for full details check out the following page; 366/407/413 OEM Versions

hardwarepub/modules/407qhm.txt · Last modified: 2016/02/22 11:26 by Bob Lynas
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