7-Day Time Switches Pulse Or Latched Output Stock No
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7-Day Time Switches Pulse or Latched Output Stock No. Nom. Supply 328-156 230V 328-162 115V 856-263 12V Introduction Lighting control This versatile range of 7-day time switches can provide a Again, a one second pulse output is used to switch impulse latched or variable pulse output, permitting use in a far wider relays to the off position. The pulse signal, from the time range of applications than standard types, with latched only switch, is routed via one of the two N/O output contacts on the outputs. impulse relay. This ensures that relays, already in the off position, are not switched on again (see circuit diagram in Applications for pulsed outputs figure 2). This lighting control application is useful, for energy conservation, ensuring that lights are not left on out of business Time signalling hours. Pulses may be transmitted, at hourly intervals, during This requires a pulse output, of about three seconds duration, these times. to e.g. ring a bell. Figure 2. Single phase lighting control circuit Contactor switching A one second pulse is sufficient, for use in the control circuit, to energise or de-energise the coil of a contactor. The main L advantage of pulse signals is that, once used to energise the On/off coil, their influence in the control circuit is removed. For Off pulse A1 1 3 push- example, a latched signal could cause a contactor to from time buttons re-energise, after a mains failure, when power is restored. In switch many industrial applications, this would be dangerous to A2 2 4 personnel. Hence no-volt release circuits are used. A pulse signal, from a push-button or time switch, is the best method of Lighting load initial control in such applications (see circuit diagram in figure 1). N Figure 1. Contactor control circuit Impulse relay (e.g. RS stock no. 324-233) Fuse L One hour boost This application requires that the pulse output is set to TS1 1 5 3 maximum, i.e. 59 minutes, 59 seconds. The time switch is operated in the conventional manner, using latched signals. The button, on the front of the time switch, is used to 4 2 provide an unscheduled on time period for e.g. to provide heating. 95 Dosing F2 The time switch is ideally suited for this application, with up to thirty switching points programmable over a 24 hour period 96 and, where necessary, repeated daily. Each switching point 21 may be set to provide an on time between one second and 59 minutes, 59 seconds. S1 22 Switching point commands definition Up to thirty switching point commands may be set during a 24 3 hour period. These can be repeated using the block TS2 1 5 13 programming procedure. A switching point command is defined as being one of the following: KM1 S2 1. A latched on command. 4 14 2. A latched off command. 2 3. An on pulse command. 4. An off pulse command. A1 Switching point commands 1. and 2. are similar to those used KM1 by common time switches. An on period is achieved by two A2 switching points, a latched on command followed by a latched off command. This uses two of the thirty available switching N points. TS1 used to de-energise contactor KM1 If on periods, less than one hour and of the same duration are TS2 used to energise contactor KM1 required, on pulse commands are preferable since they only F2 overload relay use one switching point. Furthermore, an on pulse command may be finely set in multiples of one second whereas the Setting the pulse time minimum switching period for a latched on/off cycle is one The unit is initially programmed for a one second pulse minute. duration. To set a different pulse time, the following procedure Switching point command 3. has been extensively covered. must be followed: Examples of it's use are listed earlier in this introduction. 1. Press , the flashing colon, on the display, will become Switching point command 4. has the reverse effect of switching steady. point command 3., i.e. the pulse de-energises the output relay 2. Press , a pulse indicator will appear in the display and for the set pulse time period. The use for this type of switching the numeric reading will show 0:01, indicating a one second point command is rare. Take care not to select it in error. pulse time. This can be changed using the h button to set minutes (0-59) and the m button to set seconds (01-59). Installation Note: Pressing and holding in the button will cause the setting The time switches may be snap-fitted on symmetrical DIN to be advanced rapidly. This can be done until the mounting rail to BS 5584: 1978 (EN 50 002, DIN 46227-3) or required setting is near. Thereafter, short duration housed in a suitable enclosure. Modular enclosures, permitting pulses will advance the setting more slowly until the access to the front of the time switch, are available (see the RS required setting is reached. catalogue main index under 'DIN 43 880 equipment - housings/ 3. When the required pulse time setting is displayed, press enclosures'). The time switch must be connected in . This will cause it to be programmed into the memory. accordance with the diagrams displayed on the unit. This pulse time duration will apply to any switching Safety Instructions point where an on or off pulse command is used. Electrical equipment must only be fitted by qualified Setting actual time and day of week personnel. The unit is initially set at 6:00 (6 am) on day 1. (Monday). To Ensure that the available supply voltage is within the alter these settings, the following procedure must be followed: unit's nominal range. 1. Press , the flashing colon, on the display, will become The output relay contacts on the 115V and 230V steady. versions must not be directly used to switch low 2. Set actual day of week (1-7) using the d button, the voltages (24V and 12-24V ) according to DIN 57 actual hour (0-23) using the h button and the minutes (00-59) 100 pt. 410 / VDE 0100 pt. 410 section 4.1, i.e. Safety using the m button. Extra Low Voltage. 3. When the correct time and day of week setting is displayed, The screw terminals must be protected against press to start the clock. The start of the clock is accidental contact or damage. All conductors wired to indicated by a flashing colon. them must be properly prepared in order to maintain the finger and back of hand protection (VDE 0106). Setting the switching point commands The load applied to the output relay contacts must not This section also covers block programming since it is closely exceed the ratings shown in the technical specification. associated with switch point command setting. The block programming options are: Settings Monday to Friday (days 1-5) To access all the control buttons, lift the front cover. All ten Saturday to Sunday (days 6 and 7) buttons are shown in figure 3. Monday to Thursday (days 1-4) Monday to Saturday (days 1-6) Figure 3. Front panel push buttons Monday to Sunday (days 1-7) ±1h C 1x The switching point commands may also be assigned to individual days. To display the first switching point, press the SET button. If the erase procedure as detailed under 'Erase all settings' has been carried out, the first switching point will be displayed as d h m shown in figure 4. Figure 4. 'On' switching point display SET ON Initial switch on The time switch must be installed and wired in accordance with the instructions detailed above. On applying power to the unit, the LCD display will take up to two minutes to become visible. 1 2 3 4 5 6 7 Erase all settings This procedure is best followed when the time switch is first installed. Notice that this switching point is automatically designated as 1. Press the SET button. an ON type, i.e. only the latched on or on pulse commands 2. Press again and hold-in the SET button while simultaneously may be programmed in. pressing C with a pencil or similar pointed object. 1. The first choice available is the day or days required. The 3. Release both buttons. block 'Monday to Sunday (days 1-7)' is first one displayed. 4. Press the button. Continually pressing the d button causes the time switch to The time switch is now ready to accept new settings. scroll through the choice of block programming and individual day options available. When the required day or block of days are displayed, proceed to the next step. 2. Set the on time using the h and m buttons. Note: Pressing and holding in the button will cause the setting i.e. the contacts will change to on when the to be advanced rapidly. This can be done until the next on command is received. required setting is near. Thereafter, short duration ON This is the permanent on mode. pulses will advance the setting more slowly until the Fix i.e. the contacts will not be changed to off by required setting is reached. the next off command. Only the ☞ button When the required on time is displayed, proceed to the will restore the time switch to the normal run next step. mode. 3. During this step, a choice of the command type is made: OFF This is the permanent off mode. If a latched on command is required there is no need for Fix i.e.