Electronic Step Controller
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1 4 915 Electronic Step Controller, Adjustable switch-on delay (typically used to prevent current surges on startup and after a power failure) Adjustable switch-on points Adjustable switching differential Interlock function for controllers connected in sequence Use Electronic step controller used to switch devices (pumps, electric heating coils, compressors, humidifiers, fans etc) on and off in stages Used in conjunction with the CLASSIC, DESIGO 30 controllers and POLYGYR Type summary Function 1-step controller (voltage relay) -step controller 4-step controller Type Technical design The US-E electronic step controllers operate over a DC 0 10 V control signal range The switch-on points can be adjusted individually for each step The switching differential and switch-on delay are also adjustable, but are the same for each step CE1N4915en Siemens Building Technologies HVAC Products
2 On a rising voltage signal, step 1 is switched on when the selected voltage value U E1 is reached and the delay time ( switch) has elapsed The time delay for step is also initiated and the switch-on process is repeated for step and the subsequent steps in the same manner With a falling control signal, the steps switch off in the reverse sequence without a time delay The switch-off points occur at the voltages defined by switching differential The switch states are indicated by LEDs on the controller 511 UE1 UD The US-E step controllers each have an interlock input and an interlock output This enables two devices to be connected in series, such that the first stage of the second device cannot switch on until the last stage of the first device has been switched on Switching diagrams U E U E U E1 U E1 U E U E U E1 U E U E3 U E4 Mechanical design The step controllers consist of a metal housing and a PCB which accommodates the relays Two-part plug-in terminal blocks are provided for the external connections The adjustment potentiometers for the switch-on delay, switch-on voltage and switching differential are located on the PCB under the hinged cover /6 Siemens Building Technologies Electronic Step Controller,, CE1N4915en HVAC Products
3 Fitting notes Ensure free access to the connection terminals To dissipate the heat generated during operation, adequate air circulation must be allowed for max ø 4,5 mm Rail mounting The controller base is designed for snapmounting on DIN rails Rail type: EN x 75 Surface mounting Four clear screw-holes are provided for surface mounting Technical data Supply voltage Nominal voltage Tolerance Power consumption Primary fuse Signal input Control signal Interlock input Signal output:,, Interlock output Contact rating per step Voltage against earth Switch-on voltage, adjustable Switching differential, adjustable Safety low voltage (SELV) AC 4 V, Hz +15 / 10 % : VA / : 4 VA / : 6 VA None DC 0 10 V Open = No interlock / 0 V (NS) = Interlocked Volt-free change-over contacts Yes Max AC 50 V Max 5 A resistive Max A inductive, cosϕ ž 04 Min admissible load: 10 ma at DC 5 V Max AC 50 V DC 1 11 V DC 1 10 V, individually for each step DC 1 10 V, individually for each step DC 05 9 V DC 05 5 V (same for each step) DC 05 5 V (same for each step) Switch-on delay, adjustable 0 60 s (same for each step) Principle of operation Relays energised with rising voltage Connections: Connection terminals Plug-in screw terminals x 15 mm Siemens Building Technologies Electronic Step Controller,, CE1N4915en HVAC Products /6
4 Max cable length Weight (including packaging): Dimensions (W x H x D) General ambient conditions: Usage Temperature range Operation Transport and storage Ambient humidity See installation guidelines 05 kg 040 kg 045 kg 108 x 13 x 5 mm Built-in unit for control panel mounting 5 45 C 5 70 C %rh Mounting Snapped onto DIN rail (EN x 75) or screwed to a flat surface Safety: Product safety Overvoltage category Contamination level Electrical safety EN II SELV-E (PELV to IEC ) Function Typ 1B to EN Conformity This product meets the requirements for marking Connection terminals Caution Note the technical data for the relay contacts: AC 50 V / 5() A TE NS LS Y Input DC 010 V Interlock input Interlock output Relay 1 Relay Relay 3 Relay 4 Supply Voltage AC 4 V 4915A01 NS = Reference point Connection diagrams Connections for one step controller RK / RCK US-E Supply Voltage AC 4 V NS LS A0 4/6 Siemens Building Technologies Electronic Step Controller,, CE1N4915en HVAC Products
5 Connections for two step controllers with sequence interlock RK / RCK US-E US-E Supply Voltage AC 4 V NS LS A03 Dimension , Siemens Building Technologies Electronic Step Controller,, CE1N4915en HVAC Products /6
6 and , /6 001 Siemens Building Technologies Ltd Subject to alteration Siemens Building Technologies Electronic Step Controller,, CE1N4915en HVAC Products
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