Gefran W211 Data Sheet
PROFILE
Wattcor W211 line offers a wide range of
solid state power controllers with “zero
crossing” switching for resistive loads
with current ratings up to 600A and
660Vac nominal voltages.
The models of the W211 series accept
Vdc and Vac logic controls. The
conduction is activated by the control
signal at the first zero crossing of the
load power voltage. Switching off occurs
by the first zero crossing of the load
current after disabling the control signal.
The control of three-phase loads can be
by two or three W211 in series and fired
in parallel. Each model is equipped with
a logic input to disable the solid state
relay/power controller and eventually
break off power supply. Different options
are available for the more critical
applications, such as the “load control”
(RPC option) which detects and indicates
partial load failure interruption/cut-off,
with a LED on the faceplate, and a relay
alarm output. The DTC option allows the
control of a possible SCR short-circuit or
the complete current failure in the load. A
further safety option is represented by
the “electronic cut-off” circuit, (DE
option), a device protecting the power
element against a momentary excess
current higher than a selected value,
corresponding to approx. 13 times the
nominal current of the solid state power
controller. The alarm condition disables
the power supply, activates an alarm
relay (in common with RPC option) and
allows the instrument resetting through a
front button. The WATTCOR W211 series
are designed to guarantee nominal
current and voltage values at 50°C
ambient temperature, with a working
temperature range from -5°C up to 60°C.
250A and 600A units are supplied with
internal fuse and digital output for the
fuse status. Signal connections are made
via “plug-in” connectors to enable easy
wiring.
The instrument can be DIN rail or panel
mounted (from 250 up to 600A current
ratings, panel mounting only).
TECHNICAL DATA
General Features
Nominal working voltage
- 660Vac (max. range 20...725Vac)
Nominal frequency: 50/60Hz
Current Ratings (50°C)
W211 (25-40-75-100-150-250-400-600A)
POWER CONTROLLERS, from 1KW to 400KW
Main Features
• Conduction inhibition input
• Overcurrent protection (DE option)
• Detection of partial load failure
(RPC option)
• SCR diagnosis circuit and complete
load failure (DTC option)
• Input control from Vdc and Vac
logic signal
• Zero crossing switching of mains
voltage
• High capacity anti-parallel SCR
double thyristor
• LED status indicators
• MOV protections (varistor)
• DIN rail or panel mounting
(depending on version)
Main Applications
• Industrial heat-treatment
furnaces
• Industrial cooling plants
• Painting plants
• Driers for ceramics, paper
and textile products
• Industrial heaters
• Ovens and furnaces
• Sterilizers
Repetitive Non repetitive
overcurrent overcurrent
(t=1s) (t=20ms)
25Arms ≤ 74A ≤ 600A
40Arms ≤ 100A ≤ 1500A
75Arms ≤ 180A ≤ 1700A
100Arms ≤ 300A ≤ 4800A
150Arms ≤ 300A ≤ 4800A
250Arms ≤ 450A ≤ 7800A
400Arms ≤ 2000A ≤ 15000A
600Arms ≤ 2000A ≤ 15000A
I2t for fusing Critical dv/dt
(t=1-10ms) with output
disactivated
25Arms ≤ 1800A2s 1000V/µs
40Arms ≤ 11200A2s 1000V/µs
75Arms ≤ 14450A2s 1000V/µs
100Arms ≤ 86200A2s 1000V/µs
150Arms ≤ 86200A2s 1000V/µs
250Arms ≤ 200000A2s 1000V/µs
400Arms ≤ 1125000A2s 500V/µs
600Arms ≤ 1125000A2s 500V/µs
Dissipated Power:
1.2 W per Amp of load
Control Input
• Two inputs available for Vdc and Vac
logic signals
• Option for control via contact free from
potential (option 4)
• Max. voltage-range:0...30Vdc, 0...32Vac
• Safety power-up voltage:< 3Vdc, <5Vac
• Safety power-off voltage: >5Vdc,≥15Vac
• Impedance: 1KW@5Vdc,
2.5KW@30Vdc,1.5KW for Vac
Inhibition Input
• Max. voltage range: 0...30Vdc
• Impedance: 15KW
• Active inhibition: ≥ 5Vdc
Auxiliary Power Supply
- Required only if an option or a fan have
been selected
• 115 or 230Vac 50...60Hz - 5VA with
phase independent of the voltage on the
load
- Fan power supply (for ratings ≥150A)
• 115 or 230Vac 50/60Hz - 35VA
Partial Load Failure Option (RPC)
• Detects a decrease in the load current
(in regard to a pre-selected value),
distinguishing one caused by a mains
voltage decrease. It is necessary to
specify the voltage applied to the load
(115 or 230 or 440Vac ± 10%)
• Current limit point selectable from 30%
up to 100% of nominal current (to be set
via a front trimmer).
• Min. working time to let the alarm start:
400ms
• Alarm output: relay with NO 5A-250Vac
working contact (shared by the DE
option).
SCR (DTC) Control and Complete
Load Failure Option
Detects current crossing in the load when
there is no control signal (SCR shortcircuit).
Detects load current failure when a
control signal is active (complete load or
SCR failure/interruption, fuse break, load
voltage failure).
The alarm mode, with memory or not, is
selectable via an internal switch.
Overcurrent Protection Option (DE)
• Switching off with memory of the SCR if
current exceeds the nominal value by 13
times
• Option available for ratings from 25 up
to 150A
• Max. response time: 10ms@50Hz;
8.33ms@60Hz
• Alarm output: 5A-250V no contact relay
(shared by RPC option)
• Reset of standard working through a
front-face key
• This option does not replace extra-fast
fuses, which should be used in any
installation.
Installation Comments
It is necessary to install the instrument
correctly inside the panel to ensure best
reliability:
• Max. inclination as to the vertical axis:
10°
• Vertical distance between two
instruments: > 200mm
• Horizontal distance between two
instruments: > 20mm
POWER DISSIPATION CURVES
TYPE OF FUNCTIONING
Ratings from 25 up to 150A:
- DIN rapid rail mounting
- Panel mounting kit for ratings 75-150A (option 1886001)
MOUNTING
Ambient Temperature Ambient Temperature
Effective current A
Effective current A
Control signal
Load current
Ratings from 250 to 600A:
- Panel mounting only
Rating 600A
Rating 400A
Rating 250A
Rating 150A
Rating 100A
Rating 75A
Rating 40A
Rating 25A
140
120
100
80
60
40
20
0°C10°C20°C30°C40°C50°C60°C
700
600
500
400
300
200
100
0°C10°C20°C30°C40°C50°C60°C
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