The tickRenderer is inside axis and not inside the rendererOptions.

HTML

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/jquery.jqplot.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.dateAxisRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.canvasAxisTickRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.canvasTextRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.highlighter.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.pointLabels.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.categoryAxisRenderer.min.js"></script>

<div id="container"></div>

CSS

#container{
    width: 100%;
    height: 100%;
}

//jquery.jqplot.css
/*rules for the plot target div.  These will be cascaded down to all plot elements according to css rules*/
.jqplot-target {
    position: relative;
    color: #666666;
    font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
    font-size: 1em;
/*    height: 300px;
    width: 400px;*/
}

/*rules applied to all axes*/
.jqplot-axis {
    font-size: 0.75em;
}

.jqplot-xaxis {
    margin-top: 10px;
}

.jqplot-x2axis {
    margin-bottom: 10px;
}

.jqplot-yaxis {
    margin-right: 10px;
}

.jqplot-y2axis, .jqplot-y3axis, .jqplot-y4axis, .jqplot-y5axis, .jqplot-y6axis, .jqplot-y7axis, .jqplot-y8axis, .jqplot-y9axis, .jqplot-yMidAxis {
    margin-left: 10px;
    margin-right: 10px;
}

/*rules applied to all axis tick divs*/
.jqplot-axis-tick, .jqplot-xaxis-tick, .jqplot-yaxis-tick, .jqplot-x2axis-tick, .jqplot-y2axis-tick, .jqplot-y3axis-tick, .jqplot-y4axis-tick, .jqplot-y5axis-tick, .jqplot-y6axis-tick, .jqplot-y7axis-tick, .jqplot-y8axis-tick, .jqplot-y9axis-tick, .jqplot-yMidAxis-tick {
    position: absolute;
    white-space: pre;
}


.jqplot-xaxis-tick {
    top: 0px;
    /* initial position untill tick is drawn in proper place */
    left: 15px;
/*    padding-top: 10px;*/
    vertical-align: top;
}

.jqplot-x2axis-tick {
    bottom: 0px;
    /* initial position untill tick is drawn in proper place */
    left: 15px;
/*    padding-bottom: 10px;*/
    vertical-align: bottom;
}

.jqplot-yaxis-tick {
    right: 0px;
    /* initial position untill tick is drawn in proper place */
    top: 15px;
/*    padding-right: 10px;*/
    text-align: right;
}

.jqplot-yaxis-tick.jqplot-breakTick {
    right: -20px;
    margin-right: 0px;
    padding:1px 5px 1px 5px;
/*    background-color: white;*/
    z-index: 2;
    font-size: 1.5em;
}

.jqplot-y2axis-tick, .jqplot-y3axis-tick, .jqplot-y4axis-tick, .jqplot-y5axis-tick, .jqplot-y6axis-tick, .jqplot-y7axis-tick, .jqplot-y8axis-tick, .jqplot-y9axis-tick {
...

JavaScript

$(document).ready(function() {


        var seriesCnf = Array();
        var loc = Array();

        // add location values
        loc.push([[1340877534000, 1, 'lagehaghorst'] , [1340877569000, 1, 'lagehaghorst' ]]);
        seriesCnf.push({color: "#941B80", label: "Locatie"});
        loc.push([[1340877779000, 1, 'weegnet'] , [1340877869000, 1, 'weegnet' ]]);
        seriesCnf.push({color: "#941B80"});
        loc.push([[1340877989000, 1, 'lagehaghorst'] , [1340878139000, 1, 'lagehaghorst' ]]);
        seriesCnf.push({color: "#941B80"});

        // add ignition values
        loc.push([[1340877534000, 2, 'uit'], [1340877561000, 2, null]]);
        seriesCnf.push({color: "#FF0000", showMarker:false, label: "Contact"});
        loc.push([[1340877561000, 2, 'aan'], [1340877779000, 2, null]]);
        seriesCnf.push({color: "#00FF00", showMarker:false, pointLabels: {location: 'n'}});
        loc.push([[1340877779000, 2, 'uit'], [1340877839000, 2, null]]);
        seriesCnf.push({color: "#FF0000", showMarker:false});
        loc.push([[1340877839000, 2, 'aan'], [1340878019000, 2, null]]);
        seriesCnf.push({color: "#00FF00", showMarker:false, pointLabels: {location: 'n'}});
        loc.push([[1340878019000, 2, 'uit'], [1340878139000, 2, null]]);
        seriesCnf.push({color: "#FF0000", showMarker:false});

        plot1 = $.jqplot('container', loc,{
            seriesColors: ["#941B80"],
            title: "Tijdlijn",
            axes: {
              xaxis: {
                renderer: $.jqplot.DateAxisRenderer,
                    tickRenderer: $.jqplot.CanvasAxisTickRenderer,
                    tickOptions: {
                        formatString: '%R',
                        angle: 0
                    },
              },
              yaxis: {
                min: 0,
                tickInterval: 1,
              }
            },
            seriesDefaults: {
                showMarker:true,
                pointLabels:{
                    show:true,
...