Frequency control
Part numbers
Product adaptations
Accessories
➜ Frequency control relay - 35 mm
■ Controls frequency variations on 50 or 60 Hz AC
networks
■ Controls its own supply voltage, connected between
phase and neutral
■ Over and underfrequency with two independent relay
outputs
■ Selectable latching (memory) function
■ LED status indication
Type Function Nominal voltage (V) Code
HHZ 50 or 60 Hz over and underfrequency
120
➞ 277 V
a
■ Customisable colours and labels
■ Fixed threshold in the generic measurement range
■ Fixed or adjustable time delay
■ Adjustable fixed hysteresis
HHZ
84872501
Description Code
Removable sealable cover for 35 mm casing
84800001
44
www.crouzet.com
General characteristics
Supply
Supply voltage Un
120
Voltage supply tolerance -15% / +10%
Operating range
a
supply voltage frequency
102
50/60 Hz ± 15%
Galvanic isolation of power supply/measurement No
Power consumption at Un
6 VA in
Immunity from micro power cuts 10 ms
Inputs and measuring cicuit
Measurement ranges 40
➞ 70 Hz
Max. measuring cycle time 200 ms/True RMS measurement
Adjustment of upper threshold -2, +0, +2, +4, +6, +8, +10 Hz
Adjustment of lower threshold +2, -0, -2, -4, -6, -8, -10 Hz
Fixed hysteresis 0.3 Hz
Display precision ±10% of full scale
Repetition accuracy with constant parameters ± 0.5%
Measuring error with voltage drift < ± 1% across the whole range
Measuring error with temperature drift ± 0.05% / °C
Timing
Delay on threshold crossing 0.1
➞ 10 s (0, +10%)
Display precision ±10% of full scale
Repetition accuracy with constant parameters ± 0.5%
Reset time 2 s
Delay on pick-up 500 ms
Output
Type of output 2 single pole changeover relay
Type of contacts No cadmium
Maximum breaking voltage
Max. breaking current
Min. breaking current
Electrical life (number of operations)
Breaking capacity (resistive)
250 V
z
5 A
10 mA / 5 V
1 x 10
1250 VA
Maximum rate 360 operations/hour at full load
Operating categories acc. to IEC 60947-5-1 AC 12, AC 13, AC 14, AC 15, DC 12, DC 13, DC 14
Mechanical life (operations)
30 x 10
Insulation
Nominal insulation voltage IEC 60664-1 400 V
Insulation coordination (IEC 60664-1 / 60255-5) Overvoltage category III: degree of pollution 3
Rated impulse withstand voltage IEC 60664-1/60255-5 4 KV (1.2 / 50 µs)
Dielectric strength IEC 60664-1/60255-5
Insulation resistance IEC 60664-1 / 60255-5
2 KV
> 500 MΩ / 500 V
General characteristics
Display power supply Green LED
Display relay 2 x yellow LEDs - These LEDs flash during the threshold time delay
Casing 35 mm
Mounting On 35 mm symmetrical DIN rail, IEC/EN 60715
Mounting position All positions
Material: enclosure plastic type VO to UL94 standard Incandescent wire test according to IEC 60695-2-11 & NF EN 60695-2-11
Protection (IEC 60529) Terminal block: IP20
Casing: IP30
Weight 100 g
Connecting capacity IEC 60947-1
Max. tightening torques IEC 60947-1 0.6
Operating temperature IEC 60068-2 -20
Storage temperature IEC 60068-2 -40
Rigid: 1 x 4
1 x 11 AWG - 2 x 14 AWG
Flexible with ferrules: 1 x 2.5
1 x 14 AWG - 2 x 16 AWG
➞ 1Nm / 5.3 ➞8.8 Lbf.In
➞ +50°C
➞ +70°C
Humidity IEC 60068-2-30 2 x 24 hr cycle 95% RH max. without condensation 55°C
Vibrations according to IEC/EN60068-2-6 10
➞ 150 Hz, A = 0.035 mm
Shocks IEC 60068-2-6 5 g
Standards
Marking CE (LVD) 73/23/EEC - EMC 89/336/EEC
Product standard NF EN 60255-6 / IEC 60255-6 / UL 508 / CSA C22.2 N°14
Electromagnetic compatibility Immunity EN 61000-6-2/IEC 61000-6-2
Certifications UL, CSA, GL
Emission EN 61000-6-4/EN 61000-6-3
IEC 61000-6-4/IEC 61000-6-3
Emission EN 55022 class B
pending
Conformity with environmental directives RoHS, WEEE
➞ 277 V
➞ 308 V
a
z
4
a
6
a
50 Hz 1 min.
2
a
a
c
c
- 2 x 2.52 mm2
2
- 2 x 1.52 mm
2
45
Overview
Frequency control
Principles
The HHZ control relay controls frequency variations on 50 or 60 Hz networks.
It can be used to monitor under and overfrequency, by setting two independent thresholds. It has two relay outputs: one per threshold.
Operating principle
HHZ - Over and underfrequency controller
Function selector switch:
Set the selector switch to the 50 or 60 Hz frequency of the network being monitored, select with or without memory mode. The switch position, and hence
the operating mode, is read by the product on energisation.
If the switch is set to a non-conforming position on energisation, the product goes into fault mode, the output relay stays open and the LEDs flash to signal
the position error.
If the switch position changes while the unit is operating, all the LEDs flash but the product continues to work normally with the function selected on
energisation prior to the change of position.
The LEDs return to their normal state if the switch is reset to its initial position defined before the last energisation.
The relay monitors its own supply voltage.
The over and underfrequency threshold values are set using two potentiometers, graduated with the drift value of the frequency to be monitored.
A x1/x2 switch can be used to double the control scale. The hysteresis is set at 0.3 Hz.
When the unit is powered up with a measured fault, the relay stays open.
HHZ - Under and overfrequency - without latching
U
1
2
3
4
Tt
Tt
7
If the frequency of the controlled voltage exceeds the preset overfrequency threshold for longer
than the time set on the front face (0.1 to 10 s), the corresponding output relay opens and its LED
is extinguished. During the time delay, this LED flashes.
Once the frequency falls below the value of the threshold minus the hysteresis, the relay closes
5
instantly.
6
If the frequency of the controlled voltage falls below the underfrequency threshold for longer than
5
the time set on the front face (0.1 to 10 s), the corresponding output relay opens and its LED is
extinguished. During the time delay, this LED flashes.
Once the frequency rises above the threshold value plus the hysteresis, the relay closes instantly.
High threshold
B
Low threshold
C
Relay R1
D
Relay R2
E
Hysteresis
F
Frequency
G
Delay on upward threshold crossing (Tt)
H
HHZ - Under and overfrequency - with latching
U
1
2
3
4
High threshold
B
Low threshold
C
Relay R2
D
Relay R1
E
Hysteresis
F
Frequency
G
Delay on upward threshold crossing (Tt)
H
Tt
Tt
7
5
6
5
If "with memory" mode has been selected, the relay opens and stays in this position when
threshold crossing is detected.
The power supply must be disconnected to reset the product.
46
Dimensions (mm)
HHZ
3,5
www.crouzet.com
60
44
23,2
35
45
67,5
Connections
HHZ
L1
L2
L3
N
F1
1
1 A fast-blow fuse or cut-out
B
A1 A2
A1
A2
1112 14
11
R1 R2
12
14
22 21 24
5,5
– KM1
22
90
2,6
U1
V1
M1
3
W1
21
24
47
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